Two elements (Ho, Co) co-doped Bi_1-xHo_xFe_0.95Co_0.05O₃ (x = 0.05, 0.10, 0.15) samples were prepared by sol-gel method. The X-ray diffraction patterns demonstrate that Ho ions doping plays a major role in a systematic structural phase transition. The details of the magnetic properties of the samples are investigated. The magnetic properties of (Ho, Co) co-doped BiFeO₃ have been improved greatly, compared with the pure phase BiFeO₃. An exchange bias effect is observed in the samples. The local structure of the samples measured by X-ray absorption fine structure is studied to analyze the origin of the enhancement of the magnetic properties and the change of exchange bias effect of the samples. The occurrence of the exchange bias effect is attributed to the changes of the Fe-O bond length and of the local symmetry around Fe atom.

 通过溶胶-凝胶法制备了两种元素（Ho，Co）共掺杂的Bi ₁ - _x Ho _x Fe _0.95 Co _0.05 O ₃（x = 0.05，0.10，0.15）。X射线衍射图表明，Ho离子掺杂在系统的结构相变中起主要作用。研究了样品的磁性能的细节。与纯相BiFeO ₃相比，（Ho，Co）共掺杂BiFeO ₃的磁性能有了很大的提高。在样品中观察到交换偏向效应。研究了通过X射线吸收精细结构测量的样品的局部结构，以分析样品的磁性能增强起因和样品的交换偏压效应的变化。交换偏压效应的发生归因于Fe-O键长度的变化以及Fe原子周围的局部对称性的变化。