中文摘要：

通过快速液相烧结法制备了BiFeO3、Bi0.9Gd0.1FeO3和Bi0.9Gd0.1Fe0.95Ti0.05O3（BGFTO）块材.x射线衍射和拉曼散射光谱表明Gd和Ti共掺杂后的BGFTO样品产生结构相变.共掺杂样品BGFTO室温下的铁磁性得到显著提高,矫顽力达到1.51T,剩余磁矩为0.175emu/g.磁性得到显著提高的根本原因是共掺杂引起元素替换导致了体系中的螺旋磁结构被抑制.A位和B位共掺杂是引发BiFeO3自发磁化的最有效的方法.

英文摘要：

Single-phase BiFeO3、Bi0.9Gd0.1FeO3 and Bi0.9Gd0.1Fe0.95Ti0.05O3（BGFTO） bulk ceramics were prepared by a rapid liquid sintering method. X-ray diffraction and Raman scattering spectra reveal that a structural transitiontion occurs for Gd and Ti codoped sample BGFTO. The ferromagnetic properties of BGFTO are remarkably improved with the coercivity 1.51 T and the remnant magnetization 0. 175 emu/g at room temperature. The enhanced magnetic properties can be attributed to the substitution-induced suppression of spin spiral structure. Codoping can provide a most effective way to induce spontaneous magnetization in BiFeO3.