Abstract The effect of double crystal symmetries on the magnetic property of Bi1-xYxFe1-xMnxO3 has been reported in the present article. The impurity phases (i.e. Bi2Fe4O9, Bi25FeO39 etc.) have been significantly reduced with the co-substitution of Y and Mn in Bi and Fe sites respectively. Rietveld refinement of the X-ray Diffraction patterns reveals the mixed crystal structure of Rhombohedra (R3c space group) as well as Orthorhombic (Pbnm space group) crystallographic symmetry. Percentage of R3c crystal symmetry decreases and Pbnm crystal symmetry increases with the increase in co-substitution of Y and Mn. Peak position in Raman spectra shifts as well as increase the peak broadening with the increase in percentage of co-substitution. It reveals the structural changes in the co-substituted BFO and supports to the XRD analysis. Magnetization has been found to increase with co-substitution and maximum was observed for x = 0.075 compound. A correlation between the crystal symmetries and magnetic property has been established systematically. A phase diagram has been reported by correlating the crystal symmetries and magnetic parameters of co-substituted BFO.

中文翻译：

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共取代（Y 和 Mn）铋铁氧体的双晶对称性和磁序

摘要 本文报道了双晶对称性对Bi1-xYxFe1-xMnxO3 磁性能的影响。随着 Y 和 Mn 分别在 Bi 和 Fe 位点的共同取代，杂质相（即 Bi2Fe4O9、Bi25FeO39 等）已经显着减少。X 射线衍射图的 Rietveld 细化揭示了菱面体（R3c 空间群）的混合晶体结构以及正交（Pbnm 空间群）晶体学对称性。随着Y和Mn共取代的增加，R3c晶体对称性的百分比降低而Pbnm晶体对称性增加。随着共取代百分比的增加，拉曼光谱中的峰位置会发生偏移并增加峰展宽。它揭示了共取代 BFO 的结构变化并支持 XRD 分析。已发现磁化随共取代而增加，并且观察到 x = 0.075 化合物的最大值。已经系统地建立了晶体对称性和磁性之间的相关性。已通过关联共取代 BFO 的晶体对称性和磁参数报告了相图。