Crystallographic, Electric and Thermochemieal Properties of the Perovskite-Type Ln_<1-x>Sr_xCoO_3 (Ln: Lanthanoid Element)

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The perovskite-type compounds Ln_<1-x>Sr_xCoO_3 (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, Lato 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 La_<1-x>Sr_xCoO_3, 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.
社団法人応用物理学会の論文
1974-01-05