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Crystallographic, Electric and Thermochemical Properties of the Perovskite-Type Ln1-xSrxCoO3 (Ln: Lanthanoid Element)

The perovskite-type compounds Ln1-xSrxCoO3 (Ln=lanthanoid element) were synthesized, and their crystallographic, electric and thermochemical properties were investigated. The region of the perovskite formation was determined. At the lower Sr content, lanthanoid ions, La to Sm except Ce, form the perovskite-type cobalt oxides. From Eu to Er, the lower boundary of the perovskite formation increases as the atomic number increases. The relaxation of a rhombohedral distortion of La1-xSrxCoO3, as Sr content is changed, is quantitatively described. At certain levels of Sr content, the compound shows that its temperature coefficient of resistivity is small in a wide temperature range. The resistivity and the non-stoichiometry of the compounds have a close relation in that the resistivity increases as the oxygen-deficiency is increased.