Abstract—

The concentration dependences of the magnetic phase transition temperature T_N, determined based on the changes in Mössbauer spectra, were investigated for a BiFeO₃ solid solution with ordered perovskite PbFe_0.5Sb_0.5O₃ and for a disordered BiFe_1 – xCr_xO₃ solid solution. It is established that the magnetic-order type in BiFe_1 – xCr_xO₃ changes from antiferromagnetic to spin-glass at a higher degree of Fe-sublattice dilution in comparison with the PbFe_0.5Nb_0.5O₃-based solid solutions presumably because of the smaller BiFeO₃ lattice parameter. Due to the local ordering of Fe³⁺ and Sb⁵⁺ ions, the T_N value decreases more rapidly (as compared to BiFe_1 – xCr_xO₃) with a decrease in the Fe³⁺ content in the lattice of (1 – x)BiFeO₃– xPbFe_0.5Sb_0.5O₃ solid solutions.

中文翻译：

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Mössbauer研究阳离子取代对BiFe 1 – x Cr x O 3和（1 – x）BiFeO 3 – x PbFe 0.5 Sb 0.5 O 3固溶体中磁性相变的影响

摘要-

研究了基于Mössbauer光谱变化确定的磁性相变温度T _N的浓度依赖性，该溶液具有有序钙钛矿PbFe _0.5 Sb _0.5 O _3的BiFeO ₃固溶体和无序的BiFe _{1 – x} Cr _x O ₃实在的方法。可以确定，与PbFe _0.5 Nb _0.5 O相比，在较高的Fe亚晶格稀释度下，BiFe _{1 – x} Cr _x O ₃中的磁序类型从反铁磁变为自旋玻璃。  基于₃的固溶体大概是因为BiFeO ₃晶格参数较小。由于Fe ³⁺和Sb ⁵⁺离子的局部有序排列，与（BiFe _{1 – x} Cr _x O ₃相比），T _N值下降更快，而（1）晶格中的Fe ³⁺含量下降。–  x）BiFeO ₃ –  x PbFe _0.5 Sb _0.5 O ₃固溶体。