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Structural and magnetic phase transformations in the BiFeO3-CaFe0.5Nb0.5O3 system

  • Magnetism and Ferroelectricity
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Abstract

The crystal structure and magnetic properties of the Bi1 − x Ca x Fe1 − x/2Nb x/2O3 system were studied. It is shown that, at x ≤ 0.15, the unit-cell symmetry of solid solutions is rhombohedral (space group R3c). Solid solutions with x ≥ 0.3 have an orthorhombic unit cell (space group Pbnm). The rhombohedral compositions are antiferromagnetic, while the orthorhombic compositions exhibit a small spontaneous magnetization due to Dzyaloshinskiĭ-Moriya interaction. In CaFe0.5Nb0.5O3, the Fe3+ and Nb5+ ions are partially ordered and the unit cell is monoclinic (space group P21/n). In the concentration range 0.15 < x < 0.30, a two-phase state (R3c + Pbnm) is revealed.

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Correspondence to I. O. Troyanchuk.

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Original Russian Text © I.O. Troyanchuk, N.V. Tereshko, M.V. Bushinskiĭ, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 4, pp. 741–745.

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Troyanchuk, I.O., Tereshko, N.V. & Bushinskiĭ, M.V. Structural and magnetic phase transformations in the BiFeO3-CaFe0.5Nb0.5O3 system. Phys. Solid State 51, 785–789 (2009). https://doi.org/10.1134/S1063783409040258

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  • DOI: https://doi.org/10.1134/S1063783409040258

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