Combination Of Scanning Electron Microscopy Research Articles

Study on the Adsorption Properties of Iron Tailings for GO

Iron tailings can be used as adsorbents to effectively remove graphene oxide (GO) in aqueous solutions. Experimental data show that pH, iron tailing quality, GO concentration and temperature have significant effects on the removal of GO, the adsorption of the tail involves a single layer adsorbed Langmuir model with exothermic reaction, and it compliance with the proposed dynamics model meets the requirements, the adsorption process is a spontaneous physical adsorption process. Combining scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) to analyze the iron tail according to the mechanisms of ore adsorption of GO, it was concluded that iron tailings might be a very promising material to effectively remove GO in aqueous solutions. The results of this research provide key information for the transportation and potential fate of GO in the natural environment.

Microstructure transformation and high temperature oxidation properties of (FeCoNi)100-xAlx new-type high-entropy alloys

Oxidation properties of (FeCoNi)100-xAlx (x = 0, 5, 10, 15, and 20) high entropy alloys were investigated in air atmosphere at 800 °C. Combined scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS) sur-face analysis and X-ray diffraction (XRD) studies revealed that the addition of Al transformed the alloy from a single FCC solid solution structure to a mixed structure of FCC and BCC, from an unevenly distributed rod-like structure to a uniformly distributed dendritic structure. With the increase of Al content, the oxidation scale mainly consists of Al2O3 and Co2O3 and the oxidation kinetic curve of (FeCoNi)80Al20 HEA reaches the minimum value, which clarifies the superior high temperature resistance.

Potential anticorrosive performance of green and sustainable inhibitor based on cellulose derivatives for carbon steel

Cellulose tetrazole (CTZ) was synthesized and tested as a benign corrosion inhibitor for carbon steel in 1 M HCl solution. Fourier-transform infrared spectroscopy (FT-IR) spectral technique, scanning electron microscope (SEM), X-ray diffraction (XRD) and thermal gravimetric analysis (TGA) were used to characterize the synthesized CTZ. The inhibitory effect of CTZ was investigated further on carbon steel corrosion in 1 M HCl using a variety of techniques including weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The surface of carbon steelwith and without CTZinhibiters was characterized by a combination of Scanning Electron Microscopy (SEM) andEnergy Dispersive X-ray Spectroscopy (EDX). Corrosive solutions were studied with UV Spectroscopy. The spectrum reported confirm the adsorption of these molecules on the iron surface, thus forming the adsorption film of a Fe-inhibitor. Electrochemical experiments indicated that CTZ works as a high performance environmentally friend carbon steel inhibitor in 1 M HCl medium, with the maximum efficiency of 94.2% at 100 ppm. The good results were attributed to the creation of CTZ adsorption films, which followed the Langmuir adsorptive process according to potentiodynamic polarization measurements. The formation of CTZ adsorption films, which followed the Langmuir adsorption isotherm, was ascribed with the favorable corrosion inhibition performance. SEM and roughness images have shown that the CTZ could effectively block acid assault by formation of adsorbed film on carbon steel surface. CTZ was found to be a mixed type corrosion inhibitor that acted predominantly as a cathodic inhibitor in electrochemical experiments.

Chemical Imaging of Single Anisotropic Polystyrene/Poly (Methacrylate) Microspheres with Complex Hierarchical Architecture.

Monodisperse polystyrene spheres are functional materials with interesting properties, such as high cohesion strength, strong adsorptivity, and surface reactivity. They have shown a high application value in biomedicine, information engineering, chromatographic fillers, supercapacitor electrode materials, and other fields. To fully understand and tailor particle synthesis, the methods for characterization of their complex 3D morphological features need to be further explored. Here we present a chemical imaging study based on three-dimensional confocal Raman microscopy (3D-CRM), scanning electron microscopy (SEM), focused ion beam (FIB), diffuse reflectance infrared Fourier transform (DRIFT), and nuclear magnetic resonance (NMR) spectroscopy for individual porous swollen polystyrene/poly (glycidyl methacrylate-co-ethylene di-methacrylate) particles. Polystyrene particles were synthesized with different co-existing chemical entities, which could be identified and assigned to distinct regions of the same particle. The porosity was studied by a combination of SEM and FIB. Images of milled particles indicated a comparable porosity on the surface and in the bulk. The combination of standard analytical techniques such as DRIFT and NMR spectroscopies yielded new insights into the inner structure and chemical composition of these particles. This knowledge supports the further development of particle synthesis and the design of new strategies to prepare particles with complex hierarchical architectures.

Automated morphometrical characterization of material phases of fired clay bricks based on Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy and Powder X-ray Diffraction

In this work, the microstructure of fired clay bricks made of five different Central European raw materials were investigated combining Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy and Powder X-ray Diffraction. Based on these extensive experimental data, a largely automated process for characterization and morphometrical quantification of material phases building up the brick’s microstructures could be developed, showing a large microstructural variety of brick materials used in Europe. The comprehensive set of data collected allows for a deep understanding of these materials and provides a reliable basis for the development and optimization of fired clay bricks using micromechanical models.

Magnetic susceptibility in the European Loess Belt: New and existing models of magnetic enhancement in loess

Magnetic susceptibility measurements play a key role in Quaternary studies. Magnetic proxies, such as low field and frequency-dependent magnetic susceptibility, are widely applied in the reconstruction of terrestrial paleoclimate, e.g., in the study of loess-paleosol successions. In general, the interpretation of loess magnetic susceptibility signals is based on two commonly accepted models: the pedogenic magnetic enhancement and wind-vigour models. However, there are an increasing number of cases where such models cannot be used. These cases show unusual relationships between the two common loess magnetic susceptibility proxies: low field and frequency-dependent magnetic susceptibility. Such relationships have been attributed to various phenomena including the dissolution of fine-grain minerals and the formation of ultrafine magnetic rims on the surface of coarser grains by weathering. Despite the growing number of these exceptional cases of magnetic enhancement, our knowledge about the occurrence and potential causes of the unusual behaviour of magnetic susceptibility parameters is still limited. This, in turn, hinders the wider application of magnetic susceptibility parameters in loess. To fill this knowledge gap, magnetic susceptibility data of various profiles from the European Loess Belt were collected and compared to reveal various enhancement trends in loess. Along with the analysis of magnetic susceptibility parameters, combined scanning electron microscopy (SEM) and rock magnetic analyses were applied to samples from the Paks loess sequence in Hungary to describe some of the irregular cases, notably the cause of increasing frequency-dependent susceptibility in non-altered sediments. Analysis of loess, paleosol and common mineral samples separated from loess (e.g., muscovite) revealed that various features may be responsible for these increasing frequency-dependent susceptibility values: i) surface weathering (maghemitization) of coarser detrital grains, ii) nanofragmentation by physical weathering and iii) the appearance of significant amounts of ultrafine magnetic inclusions in micas. These special modes of magnetic enhancement of loess do not undermine the importance of the basic theories suggested above, but rather provide three mechanisms that account for some of the increasing number of unusual cases. To aid in the wider and more accurate use of magnetic susceptibility parameters in loess, we review the current magnetic enhancement models with special emphasis on the identification of unusual trends in magnetic enhancement and understanding their drivers.

Synthesis, characterization, and evaluation of xanthene derivative as highly effective, nontoxic corrosion inhibitor for mild steel immersed in 1 M HCl solution

The synthesis, characterization, and evaluation of inhibiting performance of two xanthene derivatives, namely 3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl (3-dibenzoate) (NAR2) and 3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl (3-diacetate) (NAR3) on mild steel immersed in 1 M HCl solution are performed. The in vivo tests were carried out to confirm the non-toxicity of NAR2 and NAR3. The solutions corrosive was analyzed using UV visible Spectroscopy. The recorded spectra confirm the adsorption capacity of these molecules on the surface of iron and thereby a formation of Fe–inhibitor complex film. A combination of Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray (EDX) Spectroscopy were performed to characterize the surface of mild steel, with and without the NAR2 or NAR3 inhibitors; and Electrochemical techniques were evaluated (EIS) to determine the corresponding corrosion inhibition efficiencies of NAR2 and NAR3. The Density Functional Theory (DFT)- based total energy calculations and Monte Carlo simulations were also performed to get further theoretical insights into the inhibition mechanism. The obtained results confirmed that both organic inhibitors exhibit non-toxicity, with an inhibition efficiency of 93% and 89% for NAR2 and NAR3 at 10−4 M concentrations, respectively. Also, the both inhibitor function as mixed (cathodic and anodic) type inhibitors, displace water molecules from mild steel, and form an heterogeneous films on the mild steel surface to protect against corrosion.

Chemometric study of the preservation modes of Athabaskia anax (Trilobita, Cambrian Precordillera, Mendoza, Argentina). Implications for taxonomy

Selected pygidia of the middle Cambrian corynexochid trilobite Athabaskia anax (Walcott 1916) from the Miaolingian Series of San Isidro (Precordillera, Mendoza, Argentina) are analyzed for the first time using scanning electron microscopy in combination with energy-dispersive X-ray spectrometry (SEM-EDX). Pygidia occur in a single stratigraphic level composed of fine-grained calcareous sandstones and show four types of morphological preservations. The purpose this case study is threefold: (1) to analyze in detail the sample types by means of SEM-EDX in order to explore the chemical changes of the exoskeleton induced by diagenesis; (2) to use principal component analysis (PCA) to focus on groupings as a function of the chemical composition; and (3) to analyze the possible systematic implications of the chemical data. Results show that PCA supports the distinction among the four types of morphological preservations, based mainly on differences in the contents of Ca, Al, and K, as well as Si and Mg. This suggests that diagenesis followed distinct taphonomic pathways in the single stratigraphic level and resulted in contrasting chemical compositions of the four types of morphological preservations. It is interpreted that some morphological characteristics of the pygidia are the result of chemical and structural changes taking place during fossilization and do not represent real morphological differences in the living organisms. Our results dictate caution when using some morphological characteristics of the exoskeletons to erect new taxa, which, in turn, could be used to draw erroneous conclusions on their biostratigraphy, biogeography, and palaeoecology.

The influence of a dielectric spacer layer on the morphological, optical and electrical properties of self-dewetted silver nanoparticles

ABSTRACT Metal nanoparticles attract the worldwide interest due to their interesting optical and electrical properties, which allow their implementation as promising light scatters in solar cell devices. These nanoparticles exhibit localized surface plasmon resonance (LSPR) characteristics, which are strongly dependent on both intrinsic and extrinsic factors. Tuning the LSPR characteristics yields to interesting properties in terms of enhancement, localization and guiding of the electromagnetic field on sub-wavelength scales. For that purpose, we investigate in this work the effect of dielectric spacer layer (tin oxide) with different thickness on light reflection due to random self-assembled Ag-NPs. A correlation between morphological properties, optical reflectance and electrical characteristics is established by combining scanning electron microscopy, UV-Vis-NIR spectroscopy and current–voltage analyses. Our results show that a dielectric layer with an appropriate thickness and refractive index is useful for reducing the amount of reflected light and consequently the shifted photocurrent response for all wavelengths.

Confocal Fluorescence Microscopy as a Tool for Assessment of Photoluminescent Pigments Print on Polyester Fabric

The size and distribution of the photoluminescent pigment particles within the selected binder may affect the quality and appearance of the final print significantly. Yet, the techniques for precise evaluation of size distri¬bution of the pigment particles within a 3D fabric space are rather limited, based on their intrinsic fluorescent properties. The presented work demonstrates a simple screen-printing process for the sustainable application of three different types of commercial fluorescent pigments on polyester (PES) fabric, using polydimethylsiloxane (PDMS) as a binder. A comprehensive toolbox was used to compare and study different commercial photo¬luminescent pigments and their corresponding prints, by means of size distribution and concentration effect of emission intensity, including Confocal Fluorescence Microscopy (CFM) and Scanning Electron Microscopy (SEM) in combination with complementary spectroscopic techniques, i.e. Energy Dispersive X-ray Spectroscopy (EDX) and Ultraviolet-visible (UV-vis) spectroscopy. The focus is on CFM utilised as a non-destructive tool, used for the evaluation of photoluminescent pigments´ spatial distribution within printing pastes, as well as on/within the PES fabrics.

Effects of 5-Ammonium Valeric Acid Iodide as Additive on Methyl Ammonium Lead Iodide Perovskite Solar Cells.

During the past decade, the power conversion efficiency (PCE) of perovskite solar cells (PSCs) has risen rapidly, and it now approaches the record for single crystal silicon solar cells. However, these devices still suffer from a problem of stability. To improve PSC stability, two approaches have been notably developed: the use of additives and/or post-treatments that can strengthen perovskite structures and the use of a nontypical architecture where three mesoporous layers, including a porous carbon backcontact without hole transporting layer, are employed. This paper focuses on 5-ammonium valeric acid iodide (5-AVAI or AVA) as an additive in methylammonium lead iodide (MAPI). By combining scanning electron microscopy (SEM), X-ray diffraction (XRD), time-resolved photoluminescence (TRPL), current–voltage measurements, ideality factor determination, and in-depth electrical impedance spectroscopy (EIS) investigations on various layers stacks structures, we discriminated the effects of a mesoscopic scaffold and an AVA additive. The AVA additive was found to decrease the bulk defects in perovskite (PVK) and boost the PVK resistance to moisture. The triple mesoporous structure was detrimental for the defects, but it improved the stability against humidity. On standard architecture, the PCE is 16.9% with the AVA additive instead of 18.1% for the control. A high stability of TiO2/ZrO2/carbon/perovskite cells was found due to both AVA and the protection by the all-inorganic scaffold. These cells achieved a PCE of 14.4% in the present work.

High temperature oxidation behaviour of non-equimolar AlCoCrFeNi high entropy alloys

Oxidation properties of AlCoCrFeNi high entropy alloys, i.e. 5%Al–35%Co–25%Cr–15%Fe–20%Ni (Al5Co35Cr25Fe15Ni20) and 5%Al–25%Co–20%Cr–15%Fe–35%Ni (Al5Co25Cr20Fe15Ni35), were investigated in air atmosphere at 1273 K. Thermogravimetry (TG) investigations determined that, under these conditions, the samples demonstrate scale growth according to the parabolic rate law with rate constants the order of 10−11 g2cm−4s−1. Combined scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS) surface analysis and X-ray diffraction (XRD) studies revealed that the formed protective scales consisted primarily of chromium oxide. Underneath the external Cr2O3 scale, a thin layer of the metallic substrate can be found. Below that, an internal chromium oxide scale with discontinuous Al2O3 can be observed. Al-rich precipitates can also be found in the internal layers, as well as the metallic substrates after oxidation. XRD analysis also indicated that the initial materials are single FCC phase solid solutions. From all these studies it can be concluded that both Co and Ni-rich non-equimolar AlCoCrFeNi high entropy alloys exhibit similar high temperature oxidation behaviour. Furthermore, each of the alloys has promising anti-corrosion properties that can possibly be further improved on, e.g. with higher aluminium content inside the materials.

Lithium Deposition in Single-Ion Conducting Polymer Electrolytes

Lithium metal is considered as potential anode material due to its superior energy density compared to conventional graphitic anodes.[1] However, so far its application is restricted due to inhomogeneous Li deposition during cycling, potentially causing contact losses between bulk and deposited Li or short circuit of the cell related to formation of ‘dendritic’ deposits. Theoretical models propose that single-ion conducting electrolytes afford safe and ‘dendrite-free’ cycling of lithium metal batteries (LMBs) due to immobilization of anions and thus, prevention of cell polarization.[2] In this contribution, a blend type quasi-solid single-ion conducting polymer electrolyte (SIPE), a polymer class that has attracted much attention recently, is consulted for analysis of the Li deposition behaviour. Combined scanning electron microscopy (SEM) and X-ray tomography are applied illustrating the occurrence of inhomogeneous, rather dense Li deposits agglomerating and eventually penetrating the polymer membrane independent of the applied current densities. Raman mapping, nano-mechanical (QNM) and electrochemical strain microscopy (ESM) mapping further reveal that membrane constituents and consequently membrane properties such as (mechanical) stiffness and ionic conductivity are non-homogeneously distributed within the membrane related to the phased separated morphology of the blend. This implies that the intrinsic nature of the polymer membrane is responsible for the formation of conduction channels, also governing the homogeneity of Li deposition. Beyond that, it is demonstrated how characteristics of the Li│polymer interface in salt- free SIPEs limit the achievable cell performance, particularly since limited Li+ ion diffusivity through the interfaces substantially impair efficient charge carrier transport within the cell system.

Nanosecond pulsed laser ablation of Al–Cu–Fe quasicrystalline material: Effects of solvent and fluence

Nanosecond laser pulses were used to synthesize Cu/CuO/Fe3O4 and Al2O3 nanocomposites by ablating Al–Cu–Fe quasicrystal (QC) in two different solvents, namely ethanol and deionized water. The ablation was performed for 15 min with two different laser fluences of 40 J/cm2 and 80 J/cm2 in both the media. The effects of these solvents have been studied to understand the structural and morphological transformations of nanoparticles using microscopic and spectroscopic techniques. X-ray diffraction (XRD), selected area electron diffraction (SAED) and Raman spectroscopy studies revealed the formation of Cu/CuO/Fe3O4 and Al2O3 nanocomposites in both the solvents. Furthermore, transmission elctron microscopy/high resolution transmission electron microscopy (TEM/HRTEM) and field emission scanning electron microscopy (FESEM) in combination with the energy dispersive X-ray mapping established the formation of NPs with a typical core-void-shell structure evolved in presence of ethanol, showing the crystalline Cu–Fe phase in the core and amorphous Al2O3 phase in the shell. However, in the case of deionized water, the hollow structured NPs were obtained consisting of oxides of Cu, Fe and Al. The mechanisms of the formation of two structures in these two media are controlled by the Kirkendall diffusion process, which appears to be dependent on the physical properties of the solvent i.e., thermal conductivity, viscosity and, polarity. Based on the experimental observation, a possible mechanism for the observed morphology is discussed.

Features of diagnostics of fungal ball of paranasal sinuses of iatrogenic genesis

Introduction: There are various theories of the origin of areas with high radiation density in the fungal ball of the paranasal sinuses: X-ray contrast dentist filling material; accumulation of zinc due to enzymes of the metalloproteinase group; formation of osteophytes, etc. The purpose of the study: to study the chemical composition of areas of fungal balls that have high radiological density. Methods and materials: The results of research of 26 samples of fungal bodies by scanning electron microscopy and spectrometry removed from maxillary sinuses in patients with fungal sinusitis (4 – nonodontogenic, 22 – odontogenic origin) are presented. In addition, 5 types of material most commonly used for endodontic treatment were studied. The results: It was found that fungal bodies of odontogenic origin have a heterogeneous structure with the presence of crystalline inclusions, the elemental composition of which has the characteristics of materials for endodontic treatment (Ba, Zr, W, Co), or increased content in the fungal ball of trace elements (Ti, Al and Zn), in quantities that are not characteristic of organic compounds. Conclusions: Scanning electron microscopy in combination with spectrometry can be used to identify foreign bodies of the maxillary sinus of exogenous (iatrogenic) origin and determine their role in the development of the fungal ball.

Methods to Classify Bainite in Wire Rod Steel

The microstructural description in bainitic steel is commonly ambiguous, and the interpretations of results that originate from applied methods are usually user dependent. In consequence, a manifold description of bainite makes it difficult to reveal structure–property relationships. This is why a novel classification and quantification routine for bainitic microstructures in wire rod steel is presented. The classification is based on electron probe microanalysis (EPMA), electron backscatter diffraction (EBSD), and nanohardness of the same local area. Microstructural constituents with different characteristics (carbon concentration, misorientation, and nanohardness) are classified into low‐, intermediate‐, and high‐temperature morphologies. After the classification, quantification is conducted by combining scanning electron microscopy (SEM) analysis, dilatometry, and X‐ray diffraction (XRD). The bainite quantification reveals a homogeneous microstructure for cooling along the lower bainite regime. Increasing the manganese content causes a lower sensitivity to change in the cooling parameters. Combining nanohardness and EBSD is suitable to describe microscopic microstructural properties, whereas the quantification of bainite is eligible to explain differences in the microscopic microstructural properties. The used approach avoids overcomplexity and manifold terminologies of bainitic microstructures that are commonly found in the literature.

A closer look at mineral aerosol emissions from the Makgadikgadi Pans, Botswana, using automated SEM-EDS (QEMSCAN®)

ABSTRACT This paper demonstrates the use of Quantitative Evaluation of Minerals by SCANning electron microscopy (QEMSCAN®), an automated scanning microscopy technique, which combines scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), providing ultra-fast analysis of particle grains at a micron-scale resolution. We evaluate its application in aerosol studies by comparing surface and airborne samples from the Makgadikgadi Pan in Botswana. The playa is a major global dust emitter and its aerosols have a widespread effect on atmospheric, biological and terrestrial processes. Sampling was conducted at a carefully selected surface location and associated BSNE dust trap stack at 0.25, 0.5, 0.85 1.65 meters. The dominant minerals identified here are quartz, halite, thernadite, mica, calcite and feldspar. Surface sample results from QEMSCAN are in line with other forms of elemental and mineralogical analyses. When comparing surface samples with elevated trap samples, we noted a fining and fractionation during grain entrainment, resulting in a compositional shift with height. We also observed some ultra-fine fraction losses from the BSNE traps. Overall, the single location here establishes the link between fluvial playa basin inputs, sediment storage, evaporation products and aeolian losses and outputs from a dry lake surface, not unlike semi-arid evaporative dust sources elsewhere.

Annealing effects on the structure and hardness of helium‐irradiated Cr2AlC thin films

AbstractCr2AlC MAX phase thin films prepared by radio‐frequency magnetron sputtering were irradiated at room temperature by 100 keV helium ions to a fluence of 1 × 1017 ions cm−2. The effects of thermal annealing on the structural and mechanical properties of the helium‐irradiated Cr2AlC films as well as the helium release were investigated by grazing‐incidence X‐ray diffraction (GIXRD), Raman spectroscopy, and scanning electron microscope (SEM) in combination with nano‐indentation and elastic recoil detection (ERD) analysis. The irradiation‐induced structural damage in the Cr2AlC is significantly recovered by thermal annealing at temperatures around 600℃, attributed to high defect diffusivity. After annealing to 750℃, the hardness of irradiated films recovered almost completely, which is ascribes to both defect recombination and reformation of damaged chemical bonds. Substantial helium release occurring at this annealing temperature is closely related to the damage recovery due to helium irradiation.

Scale dependence of textural alignment in shales quantified using electron microscopy

Textural alignment is the primary cause of anisotropy associated with the permeability and mechanical and acoustic properties of rocks. Although particle alignment in shales is known to be influenced by burial depth, mineralogical composition, and diagenetic history, understanding how these influence image-based measures of compaction at the micrometer to nanometer scale is not well understood. Here, we use a novel method, which combines scanning electron microscopy and image analysis algorithms, to quantify clay alignment in sedimentary rocks. For a given field of view, the alignment intensity in shales from the Podhale Basin in Poland is positively correlated with clay content based on image analysis. However, our analysis also shows that the intensity is strongly dependent on the spatial scale of imaging: as magnification increases and the field of view in the SEM images decreases, the alignment intensity drops. Therefore, in images with small fields of view, clay alignment is determined by the presence of localized equant silicate mineral grains, which effectively hinder the alignment process at the micrometer scale. By contrast, in images with larger fields of view, alignment intensity is determined by the overall compaction state. We also show that when the field of view is constant, alignment intensity decreases with pixel density, and we suggest a range of operating parameters required for obtaining optimum values for alignment intensity from SEM images of shales.

Strength and Plasticity of Cast Solid-Soluble High-Entropy Alloys

The strength properties of cast solid-solution high-entropy alloys based on bcc and fcc lattices in the temperature range from -70 to 900°C have been investigated. Melting ingots weighing up to 200 g were carried out in a vacuum-arc furnace MIFI-9 by melting the mixture in an atmosphere of purified argon with a non-consumable tungsten electrode on a water-cooled copper hearth. The X-ray phase analysis and scanning electron microscopy in combination with INCA X-ray microanalyzer were used. Hardness (HIT) and reduced elastic modulus (Er) were determined using automatic microindentation on a Micron-gamma device using the Berkovich pyramid with a 2 N load in accordance with ISO14577-1:2015. High-temperature indentation of the Vickers pyramid was carried out at a 9.8 N load in vacuum. Thehigh-entropy composition of Nb1.5Cr1.25MoV0.75Ta0.5, which is a solid solution based on the bcc lattice, is characterized by high values of hardness up to 900°C. The yield stress and plasticity of solid-solution alloys are determined depending on the temperatures of the compression tests and the type of crystal lattice. For the high-entropy composition TiZrHfVNbTa based on the bcc lattice, the yield points are almost twice as high as those of the CrMnFeCoNi composition based on the fcc lattice. To create high-entropy alloys with improved characteristics of hot hardness, it is necessary to take into account such factors as the melting point, enthalpy of mixing, and dimensional mismatch in the lattice. It was found that alloys based on bcc lattice at positive values of the enthalpy of mixing are characterized by high characteristics of plasticity and deformability, as well as normalized hardness HIT/Er and compressive yield strength at room temperature. This can be attributed to the cluster structure and distortion of the crystal lattice.