Preparation and properties of La1?xCaxCoO3 (0,2 ≤ x ≤ 0,6)

The preparatory conditions for the oxide compositions La_1?xCa_xCoO_3?δ have been determined along with their crystallographic, thermochemical, and electrical properties. Single phase solid solutions of the perovskite structure form atx < 0.6. It has been established that the compounds obtained in the open air atmosphere are oxygen deficient, the deficit increasing withx and temperature. The specific resistivity atx = 0.2–0.6 is (1–2)·10^?3 ohm·cm; it increases with the concentration of oxygen vacancies. At 0.3 ≤ x ≤ 0.6 thep-type conductivity is metallic in character with low temperature resistivity coefficients of the order (1–5)·10^?4 K^?1 in the interval 20–700°C.