Abstract
Mossbauer method was used to study a perovskite compound Bi0.9Ca0.1FeO3 at T = 295 K and at temperature above TN. It has been established that Bi0.9Ca0.1FeO3 has a rhombohedral crystal structure similar to that of BiFeO3. The substitution of Ca2+ for Bi3+ ions leads to the formation of three states of Fe3+ ions with an octahedral surroundings and one state with a tetrahedral oxygen surroundings with substantially different hyperfine magnetic fields. All Fe ions are in a trivalent state; the compensation of the charge deficit occurs via the formation of oxygen vacancies. Above TN, two structurally nonequivalent states of Fe3+ ions exist in the Bi0.9Ca0.1FeO3 sample, which correspond to the Fe3+ ions with an octahedral and tetrahedral oxygen coordination.
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