Study of Structural, Thermal and Electrical Properties of Sr-Doped CaMnO₃

Abstract:

Sr-doped CaMnO₃ materials have wide applications due to their thermal and electrical properties. The importance of the synthesis of Sr-doped CaMnO₃ material for various applications encourages researchers to evaluate and refine the synthesis process. In this study, Ca_1-xSr_xMnO₃ (x = 0; 0.05; 0.1; 0.15; 0.2) system has been prepared by sol-gel method followed by conventional sintering process at 850°C for 8 hr. A thorough discussion has been made on the outcomes derived from the investigation on the structural, electrical, and thermal properties of Sr-doped CaMnO₃ system using powder x-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, DC fourprobe method, thermal expansion studies, and thermoelectric power analyses. The XRD patterns of all prepared samples exhibited single phase with orthorhombic crystal structure (space group Pnma). Rietveld refinements were performed for all the patterns by using Fullprof software to extract the structural properties. The values of unit cell volume of samples tend to increase with the increment of dopant concentration, whereas the crystallite size values were decreased with dopant concentration. The microstructures of all the samples were studied using SEM, and elemental compositions were confirmed from the EDS results. Linear thermal expansion coefficients of all the samples were found to have moderate values in the temperature range from 30°C to 800°C. The electrical properties of all the system of samples were studied in the temperature range from 30°C to 400°C using DC fourprobe conductivity setup. It was found that all the samples exhibited semiconductor nature. Sr-content on the A-site suppress the electrical resistivity up to 10% of concentration and 5% dopant content exhibited the lowest electrical resistivity. The values of Seebeck coefficient found to vary from -160 µV/K to -124 µV/K with the increase of dopant content in the parent compound.

• Periodical: Key Engineering Materials (Volume 991)
• Pages: 3-20
• DOI: https://doi.org/10.4028/p-Poz406
• Online since: October 2024
• Authors: Alwiyah Nurhayati*, Kasarapu Venkataramana, C. Vishnuvardhan Reddy
• Keywords: Electrical Resistivity, Seebeck Coefficient, Sr-Doped CaMnO₃, Thermal Expansion, Thermoelectric Materials

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