Abstract

Complex oxides Sm_0.9Ca_1.1Fe_1 − yCo_yO_4 − 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 Sm_0.9Ca_1.1Fe_1 − yCo_yO_4 − 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 Sm_0.9Ca_1.1Fe_1 − yCo_yO_4 − 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 Sm_0.9Ca_1.1FeO_4 − δ has positive values in the range of 25–1100°C, testifying to the predominance of hole conductivity.

中文翻译：

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Sm 0.9 Ca 1.1 Fe 1 – y Co y O 4 –δ固溶体的热膨胀和电导率

摘要

使用硝酸甘油技术在1100°C的空气中合成了复合氧化物Sm _0.9 Ca _1.1 Fe _{1-  y} Co _y O _4-δ（y = 0，0.7）。在25–1100°C的温度范围内研究了总电导率，塞贝克系数和组合物Sm _0.9 Ca _1.1 Fe _{1-  y} Co _y O _4-δ（y = 0，0.7）的热膨胀系数的温度依赖性。且at \（{{P} _ {{{{\ text {O}}} _ {2}}}}} = 0.21 \） atm。在ΔL的线性部分上计算平均TEC值/ L = f（T）依赖性。结果表明，所考虑的样品具有半导体型导电性。钴浓度的增加使Sm _0.9 Ca _1.1 Fe _{1-  y} Co _y O _4-δ的总电导率增加。根据Arrhenius坐标中氧化物的总电导率的依赖性来计算电导率的活化能。发现Sm _0.9 Ca _1.1 FeO _4-δ塞贝克系数的温度依赖性 在25–1100°C范围内具有正值，证明了空穴电导率的优势。