Abstract
Manganese cobaltites MnCo 2O 4.62 and MnCo 2O 4.275 having a spinel structure were studied by measuring magnetization, AC susceptibility and by XANES spectroscopy. These compounds were synthesized by decomposition of the binary oxalate Mn 1/3Co 2/3C 2O 4·2H 2O in air at 220 and 500 °C, respectively. It was found that the differences in magnetic characteristics of these cation-deficient spinels are due mainly to variations in the degree of oxidation of manganese. It was shown that the complex oxide MnCo 2O 4.62 formed right after decomposition of the binary oxalate contains about 5×10 −4 mass% metallic cobalt, which determines the dependence of magnetic susceptibility χ on the magnetic field at 300 K. The magnetic transition peculiar to the stoichiometric spinel MnCo 2O 4 at 183 K decreases to 167.5 K for MnCo 2O 4.275 and 67.5 K for MnCo 2O 4.62.
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