Large Electrical Resistivity Research Articles

Extremely low loss and high electrical resistivity in CaBi2Nb2O9 high-temperature piezoelectric ceramic by adding WO3

An appropriate amount of WO3 was added into CaBi2Nb2O9 high-temperature piezoelectric ceramics to improve the dense microstructure and enhance the electrical properties. A portion of W ions can be incorporated into the lattice, resulting in an increase in the lattice distortion and spontaneous polarization. As a result, the ferroelectric and piezoelectric properties of the ceramics are promoted. Additionally, reducing the concentration of oxygen vacancies can increase the resistivity of ceramics and significantly reduce the dielectric loss. The CBNO-0.375 wt% WO3 sample shows a large piezoelectric coefficient of 17.1 pC/N, a high remnant polarization of 12.60 µC/cm2, a high TC of 951°C and a large electrical resistivity of 1.86 × 106 Ω·cm at 600 °C. Moreover, the dielectric loss at 600 °C maintains a low value of 0.0076, which is one to two orders of magnitude lower than that of CBNO-based ceramics. Therefore, the method of adding WO3 to construct a CBNO ceramic provides a new strategy for high-temperature piezoelectric applications.

A monolithically integrated in-textile wristband for wireless epidermal biosensing.

Textile bioelectronics that allow comfortable epidermal contact hold great promise in noninvasive biosensing. However, their applications are limited mainly because of the large intrinsic electrical resistance and low compatibility for electronics integration. We report an integrated wristband that consists of multifunctional modules in a single piece of textile to realize wireless epidermal biosensing. The in-textile metallic patterning and reliable interconnect encapsulation contribute to the excellent electrical conductivity, mechanical robustness, and waterproofness that are competitive with conventional flexible devices. Moreover, the well-maintained porous textile architectures deliver air permeability of 79 mm s-1 and moisture permeability of 270 g m-2 day-1, which are more than one order of magnitude higher than medical tapes, thus ensuring superior wearing comfort. The integrated in-textile wristband performed continuous sweat potassium monitoring in the range of 0.3 to 40 mM with long-term stability, demonstrating its great potential for wearable fitness monitoring and point-of-care testing.

Interfacial Reaction Enhanced Liquid‐Phase Sintering of Metal/Oxide Soft Magnetic Composite

AbstractSoft magnetic composites (SMCs) are ungently demanded in high‐frequency power electronics for their large magnetization and high electrical resistivity. However, traditional cold‐pressed SMCs are faced with low mechanical strength and insulation instability, which severely restricts their applications. In this study, liquid‐phase sintering techniques to prepare FeSiAl/MoO3 SMCs are orginally employed, where consolidation and insulation of metallic magnetic particles are achieved in one step. The redox reaction between FeSiAl and MoO3 melt greatly reduces the interfacial energy, facilitates fully wetting of FeSiAl particles by MoO3 melt, and promotes the densification process during sintering. In the final FeSiAl/MoO3 SMC, FeSiAl particles are bonded covalently and insulated electrically/magnetically by the resultant Al2O3 transition layer, endowing the SMC with high crushing strength of 250 MPa, cut‐off frequency of 110 MHz, permeability of 35 (@1 MHz), and low power loss of 962 kW m−3 (5 MHz, 5 mT). This study provides alternative concept for designing new SMCs, and broadens the connotation and extension of liquid‐phase sintering.

Enhancement of Extraordinary Size Effect on CaRuO3 Ultrathin Films

AbstractIn a previous report, 25 Å periodic metal–insulator transitions dependent on the thickness of CaRuO3 ultrathin films were discovered. Compared to the conventional size effect caused by quantum wells, the rate of change is a few billions of times greater at low temperatures. Although the electrical resistivity of insulating state differs by several orders with the film thickness, the enhancement trigger was not clarified. In this study, it is clarified that the magnitude of the extraordinary size effect varies with the element supply ratio owing to precise control of the molecular beam rates of calcium and ruthenium. The supplied calcium over ruthenium ratio Ca/Ru = 1.2–1.8 during CaRuO3 deposition results in a stoichiometric ratio of Ca:Ru = 1:1 on the CaRuO3 films. Calcium‐rich elemental supply conditions result in large electrical resistivity variations. Electrical resistivity oscillations with periods of T = 23.4 and 26.3 Å are observed for the growth conditions of Ca/Ru = 1.2 and 1.6, respectively. Furthermore, a flat surface with a roughness of ≈2 Å is required to observe the size effect. Thus, the insulation of an extraordinary size effect is enhanced in CaRuO3 ultrathin films grown under the condition of calcium‐rich Ca/Ru ≈ 1.6.

Ternary doping of Na+, Bi3+ and La3+ to improve piezoelectric constant and electrical resistivity simultaneously in calcium bismuth niobate ceramics

High Curie-temperature layer-structured calcium bismuth niobate (CaBi2Nb2O9) piezoelectric ceramics are promising for important application in high-temperature vibration sensors. However, such application is currently limited due to not only poor high-temperature piezoelectric constant (d33), which is attributable to spontaneous polarization along a-b plane and high coercive fields, but also inferior high-temperature electrical resistivity, which results from volatilization of Bi2O3 during the sintering process that increases defect concentration of oxygen vacancies. Herein, we report a Na+, Bi3+ and La3+ ternary-doping-strategy to obtain Ca0.8(Na0.5La0.3Bi0.2)0.2Bi2Nb2O9 ceramics, which exhibited higher piezoelectric constant and larger electrical resistivity as accompanied by a better thermal stability at high-temperatures. The piezoelectric constant was enhanced from 8.8 pC/N in pristine CaBi2Nb2O9 to 13.4 pC/N in Ca0.8(Na0.5La0.3Bi0.2)0.2Bi2Nb2O9 ceramics, which is ascribed to the presence of pseudo-tetragonal structural distortion after La3+ doping. In addition, the electrical resistivity at 600 °C was increased by more than one-order of magnitude from 3.7 × 104 Ω cm in pristine CaBi2Nb2O9 to 1.4 × 106 Ω cm in Ca0.8(Na0.5La0.3Bi0.2)0.2Bi2Nb2O9 ceramics. Such significant improvement in electrical resistivity results from the reduction in oxygen vacancies due to ternary doping of Na+, Bi3+ and La3+ and stronger binding interaction between La3+ dopants and O2− in (Bi2O2)2+ layers in Ca0.8(Na0.5La0.3Bi0.2)0.2Bi2Nb2O9 ceramics. This work demonstrates an important way of employing chemical doping to improve piezoelectric constant and electrical resistivity simultaneously at high-temperatures to tune structural distortion in bismuth-layered structural CaBi2Nb2O9 ceramics.

Time-domain acoustic-electrical analogy investigation on a high-power traveling-wave thermoacoustic electric generator

Thermoacoustic electric generator is a novel heat-to-power conversion technology with potential high efficiency and reliability, showing great potential in distributed power generation. In this paper, we conduct time-domain acoustic-electrical analogy investigations on a high-power 4-stage looped traveling-wave thermoacoustic electric generator to shed lights on the system performance. The components of a thermoacoustic system are simplified as an acoustic–electrical analogy model, thus saving computational time. Additionally, the nonlinear effects in the regenerator, heat exchanger and resonance tube are considered in establishing the time-domain equations. Method validation shows a reasonable agreement between experimental and simulated results. Transient evolutions of the oscillating pressure and volume flow rate are firstly given. Investigation is then conducted on onset temperature using different working gases of helium, argon, nitrogen, and neon. The results indicate that when the external resistance reaches 70 Ω, the minimum onset temperature difference of 112 K can be achieved with argon as the working gas. For steady-state characteristics, the influences of electric resistance and heating temperature are explored. It is found that higher heating temperature contributes to larger electric power. A large electric resistance results in a large electric resistance at high heating temperature, while the highest efficiency is achieved with a medium electric resistance. Furthermore, higher heating temperature can lead to more irreversible losses. With helium employed, a maximum electric power of 13.3 kW with thermal-to-electric efficiency of 27.4% is achieved with an electric resistance of 150 Ω and a heating temperature of 950 K, and a highest thermal-to-electric efficiency of 33.5% with electric power of 1.38 kW is obtained when the electric resistance and heating temperature are 90 Ω and 750 K, respectively. This study shows that the proposed method provides a new perspective and an effective method for understanding thermoacoustic electric generator.

Nanometer-level temperature mapping of Joule-heated carbon nanotubes by plasmon spectroscopy

We map the temperature distribution of suspended carbon nanotubes down to the 5-nm level inside a transmission electron microscope, by using electron energy-loss plasmon spectroscopy. The nanotubes are Joule heated in-situ, by individually contacting them using a biasing holder. The nanotubes can withstand current densities of over 5 × 107 A/cm2 and temperatures of over 2000 K without breaking. The temperature reaches its maximum around the nanoprobe contact, due to the comparatively large electrical resistance and small thermally-conductive area. The temperature remains high along the entire length of the CNTs, due to the excellent in-plane thermal conductivity (up to 2800 W/m/K) of the graphitic lattice. These results verify the expected robustness of these structures and confirm them as ideal candidates for applications as interconnects under extremely high current densities and temperatures.

Fabrication of ultra-fine grained Hf-based materials with superior hardness and temperature-independent electrical conductivity by a combination of high-energy ball milling and spark plasma sintering

Ultra-fine grained (UFG) hexagonal-close-packed (HCP) hafnium (Hf) and Hf-5 wt%Y2O3 (HYO) were prepared by a combination of high-energy ball milling and spark plasma sintering (SPS), and both possess high relative density (95–99%), high hardness, and low electrical conductivity. The HYO sample shows superior hardness of 12.11 GPa, which is about 6–7 times of that of coarse-grained Hf, and electrical conductivity of 2 × 105 S/m, which keeps constant and is almost independent of temperature. It is very possible for HYO with these good properties to become an excellent plasma torch cathode. The analysis of the microstructure under transmission electron microscope (TEM) and scanning electron microscope (SEM) shows that the superior hardness of the samples originates from the grain boundary (GB) strengthening and the pinning effects of the Y2O3 particles, while their almost temperature-independent electrical conductivity originates from the combining effects of the dispersion of large electrical resistivity particles Y2O3 and the dense high-angle grain boundaries (GBs).

(Digital Presentation) Electrothermal Modeling of Interfacial Phase Change Memory

Phase change memory (PCM) is a high-speed non-volatile memory that utilizes the reversible and fast transition between highly conductive crystalline phase and highly resistive (dielectric) amorphous phase of the phase change material to store information and the large electrical resistivity contrast between the two phases for retrieval of the stored data [1,2]. One of the main challenges for PCM is the large power required to heat the active region above crystallization or melting temperature. Lower energy and higher speed operations have been demonstrated with thin film superlattice stacks of phase change materials known as interfacial phase change memory (iPCM) [3-6]. The mechanisms behind the improved performance of iPCM are still under investigation but recent work indicates similar crystallization and melt-quench operation of these devices [5].In this work, we perform electrothermal finite element simulations of reset and set operations on iPCM structures consisting of alternately stacked Ge2Sb2Te5 (GST) and GeTe layers using COMSOL multiphysics [7-10]. Electrical pulses are applied for reset and set processes utilizing an internal circuit model where a transistor is used as an access device. Coupled electric current and heat transfer physics are employed to incorporate Joule heating and thermoelectric effects (Thomson heat within a single material and Peltier heat at material interfaces) with temperature dependent Seebeck coefficients, thermal conductivities, electrical resistivities, heat capacities and thermal boundary resistances (TBR) for each material / material pairs. Latent heat of fusion is included in the amorphous-crystalline and solid-liquid transitions [10], giving rise to heat release at the crystal-amorphous boundaries during crystal growth and heat absorption at the grain boundaries during amorphization. Grain boundaries and material interfaces have high energy sites, making them easier to melt, described as heterogeneous melting [10].iPCM [5] structures utilize engineered interfaces formed between nanometer scale thin-film stacks, promoting amorphization through increased number of material interfaces and reduced thermal conduction due to TBR. Furthermore, the melting temperature, electrical conductivity and Seebeck coefficient of the different materials within an iPCM device differ. Hence, such layered structures may have the advantage of melting of only one of the alternating layers assisted by local heating or cooling due to Peltier effect at the interfaces.Our results on iPCM and conventional PCM structures of same dimensions and geometry (20 nm wide, 150 nm high pore-cells) show ~ 50% reduction in reset times and more consistent set times for iPCM cells due to lesser variations in grain sizes and location of boundaries.Acknowledgment: This work is partially supported by the National Science Foundation under award DMR-1710468.

Design of thin-film configuration of SnO2–Ag2O composites for NO2 gas-sensing applications

Abstract In this study, a two-layered thin-film structure consisting of a dispersed nanoscaled Ag2O phase and SnO2 layer (SA) and a mono-composite film layer (CSA) consisting of a nanoscale Ag2O phase in the SnO2 matrix are designed and fabricated for NO2 gas sensor applications. Two-layered and mono-layered SnO2–Ag2O composite thin films were synthesized using two-step SnO2 and Ag2O sputtering processes and Ag2O/SnO2 co-sputtering approach, respectively. In NO2 gas-sensing measurement results, both SA and CSA thin films that functionalized with an appropriate Ag2O content exhibit enhanced gas-sensing responses toward low-concentration NO2 gas in comparison with that of pristine SnO2 thin film. In particular, a gas sensor made from the mono-composite SnO2–Ag2O layer demonstrates apparently higher NO2 gas-sensing performance than that of double-layered SnO2–Ag2O thin-film sensor. This is attributed to substantially numerous p–n junctions of Ag2O/SnO2 formed in the top region of the SnO2 matrix. The gas-sensing response of the optimal sample (CSA270) toward 10 ppm NO2 gas is 5.91, and the response/recovery speeds in a single cycle dynamic response plot are 28 s/168 s toward 10 ppm NO2, respectively. Such a p–n thin-film configuration is beneficial to induce large electric resistance variation before and after the introduction of NO2 target gas during gas-sensing tests. The experimental results herein demonstrate that the gas-sensing performance of p–n oxide composite thin films can be tuned via the appropriate design of composite thin-film configuration.

Nacre‐Inspired, Efficient, and Multifunctional Soft Magnetic Composites by Cold Sintering Design

Nacre‐mimetics hold great promise as integration of structure and function. Various techniques have been proposed to prepare nacre‐inspired materials, but in most cases, organic materials are usually used that decrease high‐temperature stability. Factually, efficient synthesis of nacre‐like high‐performance soft magnetic composites (SMCs) with good thermal stability is still challenging. Herein, a novel and simple strategy is reported on designing nacre‐like SMCs by cold sintering of ferrite‐coated alloy flakes with the absence of polymers. By selecting NH4HCO3 aqueous solution as transport solvent, a highly ordered nacre‐like structure and enhanced densification with large electrical resistivities and strong interfacial bonding are successfully achieved, which are superior to the cold‐sintered composites using water as transport solvent as well as the hot‐pressed composites based on alloy flakes and epoxy resin. The resultant composites illustrate large density (≈6.286 g cm−3) and electrical resistivity (≈3.9 × 105 Ω cm), allowing remarkable flexural strength (≈46.5 MPa), high permeability (μ′ = ≈107.3 at f = 10 MHz), together with low tanδ μ (≈0.09 at f = 10 MHz) and P cv (≈183.6 kW m−3 at 50 mT/100 kHz), which show great potential in high‐frequency power electronic and electrical systems. The synthesis strategy sheds light on designing other nacre‐like materials or developing new metal−ceramic composites.

Optimization of MnO2, NiO and MnO2@NiO electrodes using graphene oxide for supercapacitor applications

MnO2@GO, NiO@GO and MnO2@NiO@GO electrodes were hydrothermally fabricated for applications in supercapacitor energy storage devices. Because of its large surface area and low electrical resistance, graphene oxide (GO) was added to the nanocomposites during electrode fabrication. The mutual co-operation of diverse components and composites with GO increased the performance, longevity, and hardness of electrodes. The greatest specific capacitance measured by cyclic voltammetry (CV) at 10 ​mV/s scan rates and GCD at 1.0 A/g current density for MnO2@GO, NiO@GO, and MnO2@NiO@GO, respectively, was 652, 425, 985 and 773, 487, 1141 ​F/g for MnO2@GO, NiO@GO, and MnO2@NiO@GO. Performances of various electrodes clearly show that composites of two transition metal oxides/GO had better performance when compared to single transition metal oxide/GO and the addition of graphene oxide enhanced the supercapacitive performances of the electrodes.

Large magnon-induced anomalous Nernst conductivity in single-crystal MnBi

SummaryThermoelectric modules are a promising approach to energy harvesting and efficient cooling. In addition to the longitudinal Seebeck effect, transverse devices utilizing the anomalous Nernst effect (ANE) have recently attracted interest. For high conversion efficiency, it is required that the material have a large ANE thermoelectric power and low electrical resistance, which lead to the conductivity of the ANE. ANE is usually explained in terms of intrinsic contributions from Berry curvature. Our observations suggest that extrinsic contributions also matter. Studying single-crystal manganese-bismuth (MnBi), we find a high ANE thermopower (∼10 μV/K) under 0.6 T at 80 K, and a transverse thermoelectric conductivity of over 40 A/Km. With insight from theoretical calculations, we attribute this large ANE predominantly to a new advective magnon contribution arising from magnon-electron spin-angular momentum transfer. We propose that introducing a large spin-orbit coupling into ferromagnetic materials may enhance the ANE through the extrinsic contribution of magnons.

A large-sized cell for solar-driven CO2 conversion with a solar-to-formate conversion efficiency of 7.2%

<h2>Summary</h2> Solar-driven electrochemical (EC) reduction of CO₂ to fuel using photovoltaic (PV) cells is a promising CO₂ recycling technology. However, the scale-up of EC reactors lowers the solar-to-chemical conversion efficiency (η_STC) due to the large electric resistance of the electrode catalysts and an insufficient supply of reactants. We designed a large-sized cell to convert CO₂ to formate. It consists of five stacked electrodes (electrically parallel connected) and six series-connected single-crystalline Si PV cells (area ∼1,000 cm²). Low-resistivity anodes loaded with IrO_x and cathodes loaded with Ru complex polymer on carbon support operate without a membrane between them at a low voltage of 1.85 V. They generate a reaction current of 6.30 A, owing to the homogeneous flow of the CO₂-dissolved electrolyte to achieve a sufficient CO₂ supply and a good match between the PV and EC performances. The cell yields a conversion efficiency of 7.2% and the high production rate of 93.5 mmol/h.

Impact of impurities on the spin Hall conductivity in β -W

While the metastable $\ensuremath{\beta}$ (A15) phase of tungsten has one of the largest spin Hall angles measured, the origin of this high spin Hall conductivity is still unclear. Since large concentrations of oxygen and nitrogen are often used to stabilize $\ensuremath{\beta}$ tungsten, it is not obvious whether the high spin Hall conductivity is due to an intrinsic or extrinsic effect. In this work, we have examined the influence of O and N dopants on the spin Hall conductivity and spin Hall angle of $\ensuremath{\beta}$-W. Using multiple first-principles approaches, we examine both the intrinsic and extrinsic (skew-scattering) contributions to spin Hall conductivity. We find that intrinsic spin Hall conductivity calculations for pristine $\ensuremath{\beta}$-W are in excellent agreement with experiment. However, when the effect of high concentrations (11 at.%) of O or N interstitials on the electronic structures is taken into account, the predicted intrinsic spin Hall conductivity is significantly reduced. Skew-scattering calculations for O and N interstitials in $\ensuremath{\beta}$-W indicate that extrinsic contributions have a limited impact on the total spin Hall conductivity. However, we find that the spin-flip scattering at O and N impurities can well explain the experimentally found spin-diffusion length within the range of 1--5 nm. To explain these findings, we propose that dopants (O and N) help to stabilize $\ensuremath{\beta}$-W grains during film deposition and afterwards segregate to the grain boundaries. This process leads to films of relatively pristine small $\ensuremath{\beta}$-W grains and grain boundaries with high concentrations of O or N scattering sites. This combination provides high spin Hall conductivity and large electrical resistance, leading to high spin Hall angles. This work shows that engineering grain-boundary properties in other high spin Hall conductivity materials could provide an effective way to boost the spin Hall angle.

Excitation of high-frequency in-plane bulk acoustic resonance modes in geometrically engineered hafnium zirconium oxide nano-electro-mechanical membrane

A nano-electro-mechanical membrane created from atomic-layered ferroelectric hafnium zirconium oxide (Hf0.5Zr0.5O2), titanium nitride (TiN), and silicon dioxide is engineered to localize high quality factor (Q) in-plane bulk acoustic resonance modes over 80–840 MHz. The in-plane geometry of the membrane, with an overall thickness of 50 nm and an aspect ratio exceeding 104:1, is optimized to simultaneously preserve the stress profile needed for sustaining ferroelectric polarization and enable propagation and constructive interaction of extensional and shear waves to create bulk acoustic modes. A ferroelectric polarization of 11.2 μC/cm2 is measured at the transduction ports, which is consistent after nano-membrane release. The first, third, and seventh order width extensional modes (WE1,3,7) and the third order of the width shear mode (WS3) are electrically measured at 109, 389, 766, and 267 MHz, respectively, showing Qs over 50–100 that are dominated by the large electrical resistance of TiN electrodes. High mechanical Qs of 538, 407, 781, and 594 are extracted for the WE1,3,7 and WS3 modes, respectively, after de-embedding the TiN electrode impedance, resulting in large resonance frequency (f0) × Q products as high as 6 × 1011. The measured characteristics, along with numerical simulations, are used to extract a Young's modulus of ∼340 GPa for the 10 nm-thick Hf0.5Zr0.5O2 film, which is in close agreement with the reported ab initio estimations.

NiCo2O4 films fabricated by reactive molecular beam epitaxy and annealing in various oxygen atmospheres

Nickel cobalt spinel oxide, NiCo2O4, is an important material for spintronics because it exhibits both ferrimagnetic characteristics and electrical conductivity. Because high oxygen pressure during deposition is necessary to obtain useful properties, pulsed laser deposition has been used to fabricate NiCo2O4 films. In this study, we investigated the physical properties of NiCo2O4 films synthesized by reactive molecular beam epitaxy and annealing in a high-pressure oxygen atmosphere. The characteristics of the films strongly depended on the oxygen pressure, and a larger pressure tended to give larger magnetization and higher conductivity. Crystal structure analysis by x-ray diffraction and transmission electron microscopy revealed that the films consisted of a rock salt (Ni,Co)O phase and a spinel NiCo2O4 phase. This phase separation caused the small magnetization and large electric resistance because the rock salt phase was an antiferromagnetic insulator.

Boosted photo-electro-catalytic hydrogen evolution over the MoS2/MoO2 Schottky heterojunction by accelerating photo-generated charge kinetics

Abstract The photoelectrocatalytic water splitting of molybdenum disulfide is hindered by the intrinsic large electrical resistance among adjacent layers, serious photo-generated carrier recombination and limited utilization of visible light. Herein, we construct MoS2/MoO2 heterostructures via a facile in situ hydrothermal route, in which a Schottky junction is established between the MoS2 semiconductor and metallic MoO2. As a result, the photoelectrochemical current density of MoS2/MoO2 is enhanced about 1.6 times than that of pure MoS2, achieving −10.3 mA cm−2 at −1.8 V vs. SCE, which can be attributed to the reduced electron transfer resistance, enlarged photo-generated carrier separation efficiency and enhanced light absorption due to the presence of metallic MoO2.

Fabrication and performance of a stable micro/nano composite electret filter for effective PM2.5 capture

Airborne particulate matter (PM) pollution has raised serious concerns over both the global climate and public health. Therefore, there is an urgent need for air filters of high-efficiency and energy-saving. Pore structure optimization and electret enhancement are feasible means to improve their filtration performance. Herein, a novel sandwich-structured electret composite filter with a low pressure drop and robust filtration stability was successfully designed and fabricated. The composite filter was composed of fluffy PS microfibers with large electric resistivity and high porosity, and PAN nanofibers with high polarity and small pore size. Benefiting from the fluffy structure constructed by electrospinning at the right humidity, the tortuous pore channels created by the appropriate mixing of microfibers and nanofibers, and the abundant static charges generated by the hybrid of polar and nonpolar polymer materials, the PS/PAN/PS composite filter possessed a high filtration efficiency of 99.96% for particles of 0.30 μm, a low pressure drop of 54 Pa and a satisfactory quality factor value of 0.1449 Pa−1 at an airflow velocity of 5.3 cm/s. In particular, the composite filter exhibited better electret stability and PM2.5 loading performance than the commercial ones, which guarantees its long-term storage and usage.

Influence of trivalent lanthanides substitution on the thermoelectric properties of nanostructured Ca1−xLn3 +xMnO3−δ (Ln3+ = Sm, Ce, La; x = 0, 0.1)

Mesoporous Ca1−xLn3 +xMnO3 (Ln3+ = Sm, Ce, La; x = 0, 0.1) nanoparticles were prepared by sol–gel hydrothermal method followed by annealing under oxygen atmosphere at 950 °C. The systematic analysis revealed that due to the influence of lanthanides substitution, significant changes were occurring on the electrical and thermoelectric properties of the material. The synthesized nanopowders were characterized by XRD, Raman analysis, SEM with EDAX, HRTEM and thermoelectric measurement. Structural analysis confirmed the orthorhombic perovskite structure without distortions and the cell volume increased with a rise in the ionic radius of the Ln3+ ions. Microstructure and EDAX analysis demonstrated the grain size and stoichiometry of all the samples. HRTEM analysis is used to measure the size and shape of the nanoparticles. The physical properties of Ca0.9Ln3+0.1MnO3 nanoparticles exhibit metallic behavior with increasing temperature whereas undoped CaMnO3 shows semiconducting behavior. The electrical and thermoelectric measurements proved that Ca0.9Sm0.1MnO3 nanoparticle showed high Seebeck coefficient value, large electrical resistivity, and significant power factor, indicating a potential n-type thermoelectric material at elevated temperature.