Thermal Expansion and Conductivity of Sm0.9Ca1.1Fe1 – yCoyO4 – δ Solid Solutions
| Autor: | A. P. Galayda, Vladimir A. Cherepanov, N.E. Volkova, L. Ya. Gavrilova, A. I. Dyagileva |
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| Rok vydání: | 2020 |
| Předmět: |
Arrhenius equation
Materials science Analytical chemistry 02 engineering and technology Activation energy Atmospheric temperature range Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Thermal expansion 0104 chemical sciences symbols.namesake Electrical resistivity and conductivity Seebeck coefficient symbols Physical and Theoretical Chemistry 0210 nano-technology Solid solution |
| Zdroj: | Russian Journal of Physical Chemistry A. 94:2522-2526 |
| ISSN: | 1531-863X 0036-0244 |
| DOI: | 10.1134/s0036024420120328 |
| Popis: | Complex oxides Sm0.9Ca1.1Fe1 − yCoyO4 − δ (y = 0, 0.7) are synthesized in air at 1100°С using the glycerol-nitrate technique. The temperature dependences of the total electrical conductivity, Seebeck coefficient, and thermal expansion of the compositions Sm0.9Ca1.1Fe1 − yCoyO4 − δ (y = 0, 0.7) are studied in the 25–1100°C temperature range and at $${{P}_{{{{{\text{O}}}_{2}}}}} = 0.21$$ atm. The average TEC values are calculated over linear sections of the ΔL/L = f(T) dependences. It is shown that the considered samples possess semiconductor-type conductivity. An increase in the concentration of cobalt raises the total electrical conductivity of Sm0.9Ca1.1Fe1 − yCoyO4 − δ. The activation energy of conductivity is calculated from the dependences of the total electrical conductivity of oxides in Arrhenius coordinates. It is found that the temperature dependence of the Seebeck coefficient for Sm0.9Ca1.1FeO4 − δ has positive values in the range of 25–1100°C, testifying to the predominance of hole conductivity. |
| Databáze: | OpenAIRE |
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