The isotropic temperature factors of Sr(Co1?xMnx)O3 (x = 0, 0.1, 0.5, 0.8, and 1.0)

The cubic perovskite Sr(Co_1?xMn_x)O₃ has a maximum value of a-axis at x = 0.3 and a change of spin state of Co⁴⁺ ion from low to high. To elucidate these properties, the isotropic temperature factor (B) of strontium, cobalt, manganese, and oxygen atoms for x = 0, 0.1, 0.5, 0.8, and 0.1 have been derived from powder X-ray diffraction measurements. The isotropic temperature factor of oxygen for x = 0, 0.1, and 1.0 is small and that for x = 0.5 and 0.8 is large. This fact suggests that the oxygen ion deviates from the center of the CoOMn bond in the solid solutions with $\text{x ≧ 0.3}$. Larger CoO₆ octahedra and smaller MnO₆ octahedra, which are connected by corner sharing of oxygens of the octahedron, are distributed statistically.