Japanese Journal of Applied Physics · 1974 · 94 citations · 0 references
Natural SciencesChemistryMaterials ScienceInorganic ChemistryMaterials ChemistrySolid-state ChemistryCrystal ChemistryInorganic MaterialsLanthanide ChemistryMetal OxidesPerovskite MaterialsX-ray CrystallographyAtomic Number DependenceCobalt OxidesCobaltitesOrganic-inorganic Hybrid PerovskitesPerovskite Crystal StructurePerovskite GroupPerovskite OxidesThermochemical Properties
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.