镧系元素(Eu,Ho和Er)掺杂对BiFeO3粉末晶格结构的影响

材料导报, 2010, 24(14): 8-10.

镧系元素(Eu,Ho和Er)掺杂对BiFeO3粉末晶格结构的影响

郭冬云 ^1, , 刘长永 ^2, , 王传彬 ^3, , 沈强 ^4, , 张联盟 ^5,

1.武汉理工大学材料复合新技术国家重点实验室,武汉,430070;武汉理工大学材料科学与工程学院,武汉,430070

2.武汉理工大学材料科学与工程学院,武汉,430070

3.武汉理工大学材料复合新技术国家重点实验室,武汉,430070

4.武汉理工大学材料复合新技术国家重点实验室,武汉,430070

5.武汉理工大学材料复合新技术国家重点实验室,武汉,430070

基金项目: 国家自然科学基金(50902108) 中国科学技术部国际科技合作项目(2009DFB50470)

关键词： BiFeO3粉末 , Sol-gel法 , 晶格结构 , 容忍因子 , 掺杂

Effect of Lanthanide(Eu, Ho and Er) Doped on Crystal Structure of BiFeO3 Powder

采用Sol-gel法制备出Bi1-xLnxFeO3(BLnF;x=0、0.05、0.10、0.15、0.20;Ln=Eu,Ho和Er)系列粉末,利用XRD分析了其晶格结构.结合容忍因子的变化分析了3种元素掺杂对BiFeO3晶格结构的影响规律,以及掺杂离子半径变化对BiFeO3晶格结构的影响趋势.结果表明,在450～550℃烧结可以得到纯相的BiFeO3粉末,烧结温度过高.容易形成Bi2Fe4O9杂相;掺杂量增加,晶格参数减小;掺杂离子半径减小,晶格参数减小;Eu、Ho和Er元素掺杂量低于0.10时,可以得到纯相的BLnF,掺杂量超过0.10后,晶格结构的稳定性变差,容易形成杂相.

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