Linear Expansion Research Articles

Effects of Mellowing Practice on the Strength and Swelling Properties of Road Construction Materials: Case of Sulphate-Bearing Clay Soils Stabilised with Lime-Silica Fume Blended Binder

The main thrust of this research was to establish any benefits of mellowing, and the optimal moisture content (OMC) for compacting mellowed sulphate-bearing clay soil undergoing the stabilization process. Two three-day mellowing regimes were carried out, prior to final compaction, at different initial moisture contents of 30% or 40% OMC. The unmellowed specimens were compacted immediately after mixing with the blended stabilizers. A blend of quicklime (L) with a sustainable by-product, silica fume (SF), at a 1:1 ratio (2%L-2%SF) was used. Linear expansion and unconfined compressive strength (UCS) tests were carried out to evaluate the benefits of mellowing. The test results suggested that the mellowed test specimens achieved better UCS and swelling properties compared to the unmellowed specimens. Mellowing at 1.2 OMC produced better strength performance than at 1.4 OMC, whereas mellowed specimens at 1.4 OMC showed better resistance to linear expansion compared to 1.2 OMC. The research findings suggested that optimal performance was achieved by mellowing at the higher initial moisture condition of 40% OMC and compacting the materials at the lower moisture condition of 1.2 OMC.

Preparation and properties of porous MgO based ceramics from magnesite tailings and fused magnesia

Porous MgO based ceramics have been widely used in some key industries due to their excellent performance. To investigate the feasibility of preparing porous magnesia ceramics using magnesite tailings as a magnesium source. Porous MgO based ceramics were prepared using magnesite tailings, fused magnesia as main raw materials and soluble starch as pore-forming agent. The starting materials were mixed in different ratios and sintered at 1500 °C for 2 h to obtain good mechanical and thermophysical properties. The Mg2SiO4 plays a fixing role, inhibiting the growth of MgO grains and further promoting the discharge of pores. This fixation can prevent the linear expansion of cracks, thus increasing the fracture surface energy of the specimen. In addition, the scattering effect of pores on gas molecules decreases as the magnesite tailings content increase, so that the thermal conductivity increases. The results showed that when the mass ratio of magnesite tailings to fused magnesia was increased from 1:1 to 1:0 with 4 wt% soluble starch as the pore-forming agent, the apparent porosity decreased from 35.59% to 11.8%; the bulk density increased from 2.37 to 2.82 g∙cm−3; the linear shrinkage ratio increased from 9.28 to 24.23%; the cold compressive strength increased from 47.75 to 226.52 MPa; the residual strength retention rate after one thermal shock cycles at 1100 °C was between 64.05 and 87.76%; and the thermal conductivity increased from 7.44 to 12.23 W∙m−1 K−1.

A linear wake expansion function for the double‐Gaussian analytical wake model

AbstractThe double‐Gaussian (DG) approach for analytical wake modeling leads to a better understanding of the wake transition mechanism within a full‐wake region behind a non‐yawed horizontal‐axis wind turbine (HAWT). To date, a key parameter of the wake expansion in the DG model still has yet to be defined explicitly instead of tuning, thus limiting its usability for practical applications. The present work aims to overcome this limitation by proposing a simple linear wake expansion function for the DG model constructed from the existing parameters based on the conservation of mass and momentum. Considering the physical and statistical approaches, the proposed function is specifically intended to approximate the wake expansion downstream of a non‐yawed HAWT under turbulence inflow. Seven case studies from wind tunnel measurements and large eddy simulations under different inflow conditions were used to examine the effectiveness of the proposed function. In general, the evaluation results in the present study show the effectiveness of the proposed expansion function for the DG wake model to predict the wake expansion and its recovery behind a non‐yawed HAWT without a prior adjustment or tuning of the wake expansion parameter.

Разработка и исследование катушки Роговского для работы в условиях эксплуатации открытого распределительного устройства

The interest to use Rogowski coils (RC) as current sensors to design secondary systems increases due to application of microprocessor relay protection and automation devices, including those that support the reception and processing of information in a form of a digital code in the format of protocols defined in IEC61850, as well as the disadvantages of traditional electromagnetic current transformers. Despite the popularity of RC, there are many unstudied issues of their functioning under operating conditions of open switchgears of power facilities, especially when operating with modern relay protection and automation devices. The aim of the study is to analyze the effect of ambient temperature on the error of current conversion by Rogowski coils. Studies of Rogowski coils have been carried out using the experimental and industrial samples. During the research modern testing equipment has been used. The equipment is listed on the Unified Register of Measuring Equipment of the Russian Federation and has valid verification certificates. The analysis of the factors influencing the error of metrological channels has been carried out. The analysis is conducted based on traditional current transformers (CT). The factors influencing the measurement error of RC are systematized. Experimental data obtained as a result of the study of the RC conversion error in a wide temperature range are presented. It has been established that due to design solutions, it is possible to neutralize the influence of such factors as the position of the primary conductor, external electromagnetic fields, uneven winding, the number of layers of the secondary winding, and thermal expansion. The use of materials with a low coefficient of linear expansion to manufacture the core of the Rogowski coil makes it possible to obtain the metrological characteristics of the transducer that meet the requirements of normative technical documentation in a wide temperature range. Application of RC as a primary current sensor for relay protection and automation systems is a promising area that requires further comprehensive research, and specifically in the process of industrial operation.

Evaluation of Composites Reinforced by Processed and Unprocessed Coconut Husk Powder

Engineering activities aim to satisfy the demands of society. Not only should the economic and technological aspects be considered, but also the socio-environmental impact. In this sense, the development of composites with the incorporation of waste has been highlighted, aiming not only for better and/or cheaper materials, but also optimizing the use of natural resources. To obtain better results using industrial agro waste, we need to treat this waste to incorporate engineered composites and obtain the optimal results for each application desired. The objective of this work is to compare the effect of processing coconut husk particulates on the mechanical and thermal behavior of epoxy matrix composites, since we will need a smooth composite in the near future to be applied by brushes and sprayers with a high quality surface finish. This processing was carried out in a ball mill for 24 h. The matrix was a Bisphenol A diglycidyl ether (DGEBA)/triethylenetetramine (TETA) epoxy system. The tests that were performed were resistance to impact and compression, as well as the linear expansion test. Through this work, it can be observed that the processing of coconut husk powder was beneficial, allowing not only positive improvements to the properties of the composite, but also a better workability and wettability of the particulates, which was attributed to the change in the average size and shape of particulates. That means that the composites with processed coconut husk powders have improved impact strength (46 up to 51%) and compressive strength (88 up to 334%), in comparison with unprocessed particles.

Anion exchange membranes with efficient acid recovery obtained by quaternized poly epichlorohydrin and polyvinyl alcohol during diffusion dialysis

Herein, we discussed the synthesis of quaternized poly epichlorohydrin (QPECH) by the reaction of poly epichlorohydrin (PECH) with N, N-dimethylethanolamine (DMEA). After that, different amounts of QPECH were mixed with the polyvinyl alcohol (PVA) and tetraethyl silicate (TEOS) to fabricate a series of anion exchange membranes (AEMs) by sol-gel reaction. The chemical structure of the synthesized QPECH was effectively proved by Fourier transform infrared (FTIR) and 1H NMR. Hereafter, the composite membrane structure was determined by FT-IR, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), and the physical and chemical properties such as thermogravimetric analysis (TGA), water uptake (WR), ion exchange capacity (IEC), linear expansion rate (LER) and diffusion dialysis (DD) were tested. The performance, such as acid recovery and selectivity of PVA/QPECH composite membranes with different QPECH content, was discussed comprehensively. The results showed that the WR of the composite membrane was 82.35–158.54%, the LER was 19.23–40.74%, and the IEC was from 0.64 to 1.76 mmol/g. In the DD test simulating waste acid recovery, the acid dialysis coefficient (UH+) was in the range of 11.1–30.0*10-3 m/h, and the separation factor (S) was 24.79–42.24. The UH+ and S of the composite membranes were all better than that of commercial membrane DF-120. In conclusion, this study demonstrated that the application of anion exchange membrane based on PVA/QPECH had the potential in acid recovery by DD method.

Proper orthogonal descriptors for efficient and accurate interatomic potentials

We present the proper orthogonal descriptors for efficient and accuracy representation of the potential energy surface. The potential energy surface is represented as a many-body expansion of parametrized potentials in which the potentials are functions of atom positions and parameters. The proper orthogonal decomposition is employed to decompose the parametrized potentials into a set of proper orthogonal descriptors (PODs). Because of the rapid convergence of the proper orthogonal decomposition, relevant snapshots can be sampled exhaustively to represent the atomic neighborhood environment accurately with a small number of descriptors. The proper orthogonal descriptors are used to develop interatomic potentials by using a linear expansion of the descriptors and determining the expansion coefficients from a weighted least-squares regression against a density functional theory (DFT) training set. We present a comprehensive evaluation of the POD potentials on previously published DFT data sets comprising Li, Mo, Cu, Ni, Si, Ge, and Ta elements. The data sets represent a diverse pool of metals, transition metals, and semiconductors. The accuracy of the POD potentials are comparable to that of state-of-the-art machine learning potentials such as the spectral neighbor analysis potential (SNAP) and the atomic cluster expansion (ACE).

Design and Fabrication of Segmented GeTe/(Bi,Sb)2Te3 Thermoelectric Module with Enhanced Conversion Efficiency

AbstractGeTe and (Bi,Sb)2Te3 are two representative thermoelectric (TE) materials showing maximum performance at middle and low temperature, respectively. In order to achieve higher performance over the whole temperature range, their segmented one‐leg TE modules are designed and fabricated by one‐step spark plasma sintering (SPS). To search for contact and connect layers, the diffusion behavior of Fe, Ni, Cu, and Ti metal layers in GeTe is studied systematically. The results show that Ti with a similar linear expansivity (10.80 × 10−6 K−1) to GeTe, has low contact resistance (3 µΩ cm2) and thin diffusion layer (0.4 µm), and thus is an effective metallization layer for GeTe. The geometric structure of the GeTe/(Bi,Sb)2Te3 segmented one‐leg TE module and the ratio of GeTe to (Bi,Sb)2Te3 are determined by finite element simulation method. When the GeTe height ratio is 0.66, its theoretical maximum conversion efficiency (ηmax) can reach 15.9% without considering the thermal radiation and thermal/electrical contact resistance. The fabricated GeTe/(Bi,Sb)2Te3 segmented one‐leg TE module showed a ηmax up to 9.5% with a power density ≈ 7.45 mW mm−2, which are relatively high but lower than theoretical predictions, indicating that developing segmented TE modules is an effective approach to enhance TE conversion efficiency.

USE OF ORGANIC MATTER AND SAND IN IMPROVING PROPERTIES OF SOME SOILS OF HOLY KARBALA GOVERNORATE AFFECTED BY PHENOMENON OF CRACKING

This study was conducted to show the effect of cows' manure, date palm residues, sand fraction and the interactions between them in treating the common cracking phenomenon in some soils of holy karbala governorate, and their role in improving some of the physical characteristics of those soils, represented in soil aggregates stability, modules of rupture, and linear expansion coefficient.Two agricultural sites were selected whose soils are characterized by heavy clay textures and widespread of cracking phenomenon within the holy Karbala governorate, the first was in Al-Kamaliya area and the second in Al-Khairat area. The results, showed a decrease in number of cracked masses, and their sizes in both studied soils. with an increase in levels of addition of animal manure, and plant residues and sand,and reached to lowest in treatments in which cracks disappeared while the highest values ​​of mean weight diameter were reached in the treatments in which cracks disappeared for the soil of two study sites. Results showed that the decreased values ​​of modules of rupture and linear expansion coefficient of soil with increasing the rates of addition and reaching to the lowest values ​​in the treatments in which cracks disappeared compared to reference treatment.

Novel Water-Based Mud for Low-Permeable Reservoir in South China Sea

Conventional reservoir drill-in fluids used for drilling reservoirs in Weizhou Oilfield encounter rheological problems that result in technical problems such as hole-cleaning in openhole horizontal intervals. Hence, novel drill-in fluid was developed by optimizing the additive quantity and particle size distribution. Lab tests showed that novel drill-in fluids boast high low shearing rate viscosity, and provide promising cutting, carrying, and suspension capabilities. Furthermore, the novel drill-in fluids performed well in reservoir protection, with a permeability recovery rate of more than 90%. The novel drill-in fluids also have high inhibition capabilities with a linear expansion rate of mud shale as low as 10%, with a rolling recovery rate of up to 96.48%. Field application results showed no pipe-stuck was encountered during tripping in the horizontal interval when using the novel drill-in fluid. Moreover, by using the novel drill-in fluids, skin factor was reduced from 20.0 to −3.0, and daily oil production was double what was expected. It was concluded that novel drill-in fluids meets the demand of horizontal drilling intervals in Weizhou Oilfield and improves hole-cleaning and reservoir protection in the horizontal well.

Physicochemical properties, cytotoxicity and bioactivity of a ready-to-use bioceramic repair material

The aim of this study was to evaluate the physicochemical properties, cytotoxicity and bioactivity of a ready-to-use bioceramic material, Bio-C Repair (Angelus), in comparison with White MTA (Angelus) and Biodentine (Septodont). The physicochemical properties of setting time, radiopacity, pH, solubility, dimensional and volumetric changes were evaluated. Biocompatibility and bioactivity were assessed in Saos-2 osteoblast cell cultures by the MTT assay 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide), Neutral Red (NR), Alizarin Red (ARS), and cell migration tests. Statistical analysis was performed by ANOVA, Tukey or Bonferroni tests (α = 0.05). Bio-C Repair had the longest setting time (p < 0.05), but radiopacity and solubility were accordance with the ISO 6876/2012 standards, besides linear expansion. Bio-C Repair and MTA had similar volumetric change (p > 0.05); lower than Biodentine (p < 0.05). All the materials evaluated had an alkaline pH. Bio-C Repair was cytocompatible and promoted mineralized nodule deposition in 21 days and cell migration in 3 days. In conclusion, Bio-C Repair had adequate radiopacity above 3mm Al, solubility less than 3%, dimensional expansion, and low volumetric change. In addition, Bio-C Repair promoted an alkaline pH and presented bioactivity and biocompatibility similar to MTA and Biodentine, showing potential for use as a repair material.

Expansion microscopy through mechanical force.

In biophysics interesting phenomena take place during the interaction between biological molecules on the order of nanometers. Optical super-resolution imaging techniques surpass the diffraction limit of light enabling higher resolutions to study these phenomenon. However, super-resolution techniques usually require expensive equipment. Expansion microscopy (ExM) is a sample preparation method that facilitates super-resolution imaging by leveraging osmotic forces to physically separate features smaller than the diffraction limit of light. ExM is cheaper than and compatible with other super-resolution methods to reach the nanoscale. Currently, ExM commonly produces 4.5X linear expansion and 20X has been achieved using successive expansion steps, but this can result in fragmentation of the biological sample. Allowing the gel to absorb water to expand is also as low process. To overcome the fragmentation and time issues, here, we use a highly stretchable cross-linked polymer gel and a mechanical stretcher device to achieve similar 20X linear expansion in minutes. Since we do not rely on osmotic forces for the expansion, this method is more compatible with other techniques which are incompatible with excess water. We demonstrate our expansion microscopy method by imaging MOSE cells at 50 nm resolution. We establish mechanical force expansion microscopy as a viable sample preparation method with the same advantages as ExM while being much faster. This will also allow researchers to study time sensitive phenomenon.

Investigation of the Mechanism and Effect of Citric Acid-Based Deep Eutectic Solvents Inhibiting Hydration and Expansion of Gas Shale Clay Minerals

This study developed a shale hydration inhibitor using a citric acid-based deep eutectic solvent (Cit-DES) and hexadecylammonium bromide (cetyltrimethylammonium bromide) to aid wellbore instability and collapse caused by drilling of shale gas wells with water-based drilling fluids. Soaking and linear expansion experiments were conducted with Na-bent and Longmaxi formation shale, respectively. The changes in illite interlayer spacing, wettability, and water absorption capacity of shale samples before and after soaking in an inhibitor solution were evaluated, which indicated that the inhibitor reduced shale hydration. The results showed that the inhibitor effectively inhibits the osmotic and surface hydration of the shale. Due to the Cit-DES hydrogen bond, the inhibitor is firmly adsorbed on the shale pore wall and inserted between clay minerals, reducing the shale surface energy, hydrophilicity, and surface potential. The swelling expansion rate of shale inhibitors is only 38.9% compared to a 3% KCl solution. The amount of shale imbibition per unit mass in distilled water is 0.011 g/g. In the inhibitor, the imbibition mass per unit of shale is 0.002 g/g, which is only 23.68% of that in distilled water. The inhibitor is environment-friendly and has a broad application prospect for maintaining shale wellbore stability and preventing wellbore collapse during horizontal shale drilling operations.

Decrypting the spatial relationship between peripheral chromatin and nuclear lamina in Hutchinson-Gilford Progeria Syndrome using super-resolution microscopy techniques.

The genetic condition known as Hutchinson-Gilford Progeria Syndrome (HGPS) causes the early onset of aging symptoms and premature death. HGPS is caused by a single nucleotide mutation in the LMNA gene, resulting in a truncated form of the protein Lamin A known as ΔLA50 or Progerin. This protein modification causes aberrant lamina network organization inducing nuclear and DNA structure abnormalities, leading to the loss of peripheral heterochromatin. In this study, we examine variations in chromatin compaction in a cellular model of HPGS using Expansion Microscopy (ExM). This super-resolution microscopy technique is based on embedding biological samples into a water-absorbant polymer network that, following mechanical homogenization, enables a four-fold linear expansion in water, allowing nanoscale biophysical studies using conventional microscopes. The image analysis of the HGPS cell model shows a significant variation in chromatin compaction that seems to disrupt its physical association with the nuclear lamina. Furthermore, this loss of compaction leads to a detectable spatial separation between the lamina network, mainly composed of the mutated form Progerin, and the peripheral heterochromatin. Therefore, to quantify this distance variation caused by Progerin-induced chromatin disorganization, we analyzed a batch of control cells expressing wild-typer lamin A and HGPS cells, finding a one-order of magnitude difference between the two sets. In order to validate these results, we perform super-resolution Stimulated Emission Depletion (STED) imaging. The next step will be performing Correlative Light Electron Microscopy (CLEM) on non-expanded cells to push the resolution of our analysis even forward and to investigate chromatin compaction on a nanoscale level.

Transformed differential quadrature solution to the coupled thermal–mechanical problem in transversely isotropic media

This study provides a novel solution to the coupled thermal–mechanical problem in transversely isotropic (TI) media by using the transformed differential quadrature method (TDQM). The governing equations are transformed and then discretized by the proposed TDQM. After introducing the internal and boundary conditions, we obtain the thermal–mechanical solution of a medium with various heat sources. Several examples are set up to verify the proposed solution and to discuss the convergence of the method. Also, key parameters including the transverse isotropy of skeleton, the linear expansion coefficients and the anisotropic thermal diffusivity are investigated. Compared with the traditional differential quadrature method (DQM), the TDQM introduces the integral transform theorem to simplify the derivation process and reduce the number of algebraic equations. Consequently, it avoids the exponential increase in the number of algebraic equations when solving multi-dimensional problems.

A 3-D micromechanical framework to study damage propagation and failure of printed aligned discontinuous fiber-reinforced composites

This paper presents a novel and efficient micromechanical framework for finite element simulation of damage and failure in 3-D printed aligned discontinuous fiber-reinforced composites. The framework can predict the initiation and propagation of different types of damage in the composite under tensile loading along the fibers’ axis. The micromechanical framework includes the microstructural representation of the composite with explicit fibers and matrix in addition to linear expansions at the ends. Accurate constitutive equations are utilized for fibers, matrix, and fiber/matrix interfaces in the microstructural representation. Fibers’ locations and lengths are generated randomly; based on a target distribution for the fibers’ aspect ratios measured experimentally; within the microstructural representation. Optimal microstructural representative dimensions for reliable investigation of the mechanical response are computed by conducting sensitivity analyses. The accuracy of the micromechanical framework is validated versus the experimental results of a 3-D printed aligned discontinuous fiber-reinforced composite as the composite of interest. It is shown that the proposed framework can simulate various aspects of the mechanical response, including the failure pattern and stress-strain behavior. Subsequently, the sensitivity of the mechanical response of the composite to a few constitutive equation-related parameters, including the strength and fracture toughness of the fiber/matrix interfaces and the matrix strength, is investigated. The correlation between the studied parameters and the composite’s strength and failure pattern is also analyzed and discussed. This paper delivers valuable guidance on the mechanical response of printed aligned discontinuous fiber-reinforced composites, eventually resulting in the paradigm-shifting design, manufacturing, and analysis of such advanced composites.

Reliability of chemical osmosis as a practical method to extract water out of shale and promote shale’s mechanical stability

Wellbore instability in shale formations is one of the most bothersome problems leading to significant changes in shale’s petrophysical, mechanical, and chemical properties, and could cost billions of dollars annually. Drilling fluid’s ionic composition is one of the factors affecting wellbore stability. This paper investigates the impact of chemical osmosis, ionic diffusion, and diffusion osmosis on the stability of shale, identify the critical salt concentration, and examine the impact of ionic type and concentration on shale stability. Experimental methods include utilization of shale I and II through linear expansion and gravimetric measurement tests using different salts. Results show that the critical salt concentration in shale I and II is 8 w/w%. Chemical osmosis is found to be a reliable method for water extraction out of shale if critical concentration value is not surpassed. Beyond this value, the ionic diffusion and diffusion osmosis in shale I and II were adversely affecting shale’s mechanical and chemical stability. The swelling and gravimetric ions and water uptake tests showed that shale is a leaky semi-permeable membrane, and that chemical osmosis could be jeopardized by ionic transport into shale. However, the water transport impact on changes in the thickness of diffuse double layer of clay needs to be investigated. The impact of temperature on water and ions transportation into shale needs to be examined to reflect in-situ conditions. In this study, the cation type that makes up the salt was varied while the anion type was fixed. Since both cations and anions tend to diffuse into shale in the presence of a concentration gradient, it is recommended to vary the anion type to study the combined impact of cation and anion type on shale stability.

A novel coupled thermo‐mechanical solution for layered isotropic media under various time‐dependent loadings

AbstractThis study proposes a novel coupled thermo‐mechanical solution for the response of layered isotropic media subjected to time‐varying loads by applying the transformed differential quadrature method (TDQM). Different from the methods of dealing with time partial derivatives with the Laplace transform, this solution discretizes the temporal domain according to the differential quadrature rule, resulting in a more convergent solution under various time‐varying loads. Then, the governing equations are transformed into the Hankel transformed domain that can be solved by the proposed TDQM. Examples are examined to verify the proposed solution and to discuss the convergence of the method. Meanwhile, the coupled thermo‐mechanical responses of the media subjected to time‐harmonic loads are obtained by the TDQM and the method using the Laplace transform, respectively. Comparisons are made to show the better convergence and efficiency of the TDQM. Furthermore, key parameters including the linear expansion coefficients, the thermal diffusivity and the stratification are investigated. Compared with the traditional differential quadrature method (DQM), the TDQM introduces the integral transform theorem to simplify the derivation process and reduce the number of algebraic equations. Consequently, it avoids the difficulty of large‐scale matrix inversion when solving multi‐dimensional problems, and divides the solution process into small‐scale matrix inversion and numerical transform inversion, which has advantages in solution accuracy and efficiency.

A velocity model in the wake of a thin plate parallel to uniform flow

A novel equation of wake model for the wake velocity distribution of a flat plate is proposed and verified in this study. The core of this equation is a special dimensionless method of the velocity deficit and the distance from the trailing edge of the plate along the flow direction, and a dimensionless standard deviation satisfying the law of linear expansion. In this study, it is assumed that the velocity deficit in the wake has a self-similar Gaussian distribution. Moreover, another conservation of momentum and Blasius equation is applied. The velocity distribution expression comprises the near-wake region and the far-wake region in accordance with the standard deviation of the Gaussian distribution. The model is capable of accurately predicting the velocity deficit of the near wake velocity distribution, and the dimensionless standard deviation serves as the only model parameter. The proposed model is compared with the existing research and present water-tunnel measurements, such that they are well consistent with each other.

Reducing the Cobalt Content in SrCo0.95Ti0.05O3-δ-Based Perovskites to Produce Cleaner Cathodes for IT-SOFCs

Recent studies have demonstrated the possibility of stabilizing the cubic or tetragonal perovskite phases in the SrCoO3-δ system at room temperature by partially replacing Co atoms with small amounts of highly charged cations like Ti4+ in SrCo0.95Ti0.05O3-δ. This material gives extraordinary performances as a cathode for solid oxide fuel cells (SOFCs) at intermediate temperatures (800–850 °C). In this work, we have tried to still improve this cathode in a cleaner and low-priced material by reducing its Co content, since Co is a high-cost and toxic element, additionally reducing its thermal expansion coefficient (TEC), to make it more mechanically compatible with the rest of the components of a SOFC. SrCo0.50Fe0.45Ti0.05O3-δ perovskite has been obtained by the citrate method, introducing 45% of Fe in the Co and Ti positions. Its crystalline structure has been studied by X-ray diffraction (XRD) and neutron powder diffraction (NPD) and has been correlated with mechanical and electrical properties. A chemical compatibility study between SrCo0.50Fe0.45Ti0.05O3-δ and the electrolyte La0.8Sr0.2Ga0.83Mg0.17O3-δ (LSGM) revealed that both materials do not interact at high temperatures. TEC measurements show a linear expansion over the entire temperature range. Finally, the perovskite showed good electrical conductivity and an encouraging power density value of 667 mW/cm2 at 850 °C, which indicate that this material is a promising cathode for SOFCs at intermediate temperatures.