Abstract
The room-temperature X-ray and Mössbauer data on the BiFeO3, Bi0.95Sr0.05FeO3 – y, and Bi0.90Sr0.10FeO3 – y multiferroics obtained by solid-phase synthesis are presented. The samples have a rhombohedral crystal structure with the sp. gr. R3c. The lattice parameter ah is invariable, while the parameter ch decreases with increasing strontium content. The 57Fe Mössbauer spectra recorded at a temperature of 295 K have been interpreted within the cycloid spatial spin-modulated structure model. It has been established that the easy-axis magnetic anisotropy is implemented in the investigated multiferroics. The anharmonicity parameter m of the spin-modulated structure has been measured. Upon replacement of trivalent Bi3+ ions in small amounts (x = 0–0.10) with divalent Sr2+ ions, the parameter m increases by a factor of more than 3: from 0.10(4) at x = 0.00 to 0.36(10) at x = 0.10.
Published Version
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