用溶胶凝胶法制备了BiFe_1－xMn_xO₃ ( 0≤ x ≤0．3) 系列粉晶样品，并研究了Mn 掺杂对其结构和磁性的影响．XRD 和拉曼光谱分析表明 Mn 掺杂使 BiFeO₃ 的晶体结构和振动模式发生了变化．Rietveld 精修结果显示， 在掺杂量 x =0．1 附近，BiFeO₃ 的晶体结构从菱方R3c 相转变为正交 Pbnm 相．对样品的磁性测量表明，随着 Mn 掺杂量的增加，样品的剩余磁化强度逐渐增大，在相变点附近达到最大值．这种磁性的变化与 Mn 掺杂导致的晶体结构变化有很强的关联，表明 Dzyaloshinskii- Moriya 相互作用是 BiFe_1－xMn_xO₃  磁性增强的主要原因．

BiFe_1－xMn_xO₃ ( 0≤ x ≤0.3)  crystal powders were synthesized via the sol- gel method,and the effects of Mn doping on the structure and magnetic properties of the product were investigated.XRD and Raman spectroscopy analyses reveal that Mn doping changes the crystal structure and vibration mode of BiFeO₃.Rietveld refinement re-sults indicate that the substitution of Mn at Fe- site brings about a structural phase transition from the rhombohedral R3c to the orthorhombic Pbnm around x =0.1.Magnetic measurement results demonstrate that,with the increase of the Mn dosage x,the remanent magnetization gradually increases and reaches its maximum near the phase transition point.In addition,the enhanced magnetization of BiFe_1－xMn_xO₃  strongly correlates with the variations of the crystal structural,which indicates that it is mainly attributed to the Dzyaloshinskii- Moriya interaction.