Structure, ferromagnetism and microwave absorption properties of La substituted BiFeO3 nanoparticles
Structure, ferromagnetism and microwave absorption properties of La substituted BiFeO3 nanoparticles
复制标题
La取代BiFeO3纳米颗粒的结构、铁磁性及微波吸收性能
DOI：
10.1016/j.matlet.2013.08.061
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发表时间：
2013
影响因子：
3
通讯作者：
Cao MS
中科院分区：
文献类型：
--
作者：
Li Y;Yang HJ;Yang WG;Hou ZL;Li JB;Jin HB;Yuan J;Cao MS
采用溶胶-凝胶法制备了La掺杂的BiFeO_3纳米粒子。系统地研究了La对BiFeO_3的结构、铁磁性和室温微波吸收性能的影响。当La的取代量为20M时，BiFeO_3经历了从三方结构到准四方结构的相变，在20K的磁场下，其饱和磁化强度从0.15 Memu/g提高到0.85 Memu/g。由于电磁匹配的改善，掺杂La的BiFeO_3在8.2~12.4 GHz频率范围内的微波吸收性能明显增强，最大反射损耗高达30×10~6分贝，几乎是BiFeO_3的三倍。
La substituted BiFeO3nanoparticles were prepared by the sol–gel method. The effects of La on the structure, ferromagnetism and microwave absorpion properties of BiFeO3at room temperature are investigated systematically. With 20 mol% La substitution, BiFeO3undergoes a phase transformation from rhombohedral to pseudotetragonal structure, and its saturation magnetization enhances from 0.15 to 0.85 emu/g under the magnetic field of 20 kOe. The microwave absorption properties of BiFeO3with La substitution is obviously enhanced in the frequency range from 8.2 to 12.4 GHz due to the improvement of electromagnetic match, and the maximum reflection loss reaches up to 30 dB, almost triple that of BiFeO3.