Sm、Co共掺杂对BiFeO3陶瓷漏电流和铁磁特性的影响

人工晶体学报, 2011, 40(5): 1229-1235.

Sm、Co共掺杂对BiFeO3陶瓷漏电流和铁磁特性的影响

宋桂林 ^1, , 苏健 ^2, , 周晓辉 ^3, , 杨海刚 ^4, , 王天兴 ^5, , 常方高 ^6,

1.河南师范大学物理与信息工程学院,新乡 453007;河南省光伏材料重点实验室,新乡 453007

2.河南师范大学物理与信息工程学院,新乡 453007

3.河南师范大学物理与信息工程学院,新乡 453007

4.河南师范大学物理与信息工程学院,新乡 453007;河南省光伏材料重点实验室,新乡 453007

5.河南师范大学物理与信息工程学院,新乡 453007;河南省光伏材料重点实验室,新乡 453007

6.河南师范大学物理与信息工程学院,新乡 453007;河南省光伏材料重点实验室,新乡 453007

基金项目: 河南师范大学青年基金(2010qk02) 河南省重点科技攻关项目(092102210018) 河南省教育厅自然科学研究计划(2011 A026) 国家自然科学基金(60571063)

关键词：多铁材料 , 磁滞回线 , 漏电流

Effect of Sm and Co Codoping on the Leakage Current and Ferromagnetism Properties of BiFeO3 Ceramics

采用快速液相烧结法制备Bi0.95 Sm0.05Fe1-x Cox O3(x=0、0.05、0.1)陶瓷样品,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、振动样品磁强计(VSM)对其结构、形貌和磁性进行了测量与分析.结果表明:所有样品的主衍射峰与纯相BiFeO3相吻合且具有良好的晶体结构,样品晶粒的大小随着Sm3+、Co3+掺杂而变小,其晶粒尺寸在1～5 μm; Sm3+、Co3+共掺杂有效地减小BiFeO3陶瓷的漏导电流,漏导电流密度下降1～2个数量级；所有样品在磁场为1000 Oe作用下具有完整的的磁滞回线,呈显出较弱的铁磁性.随着掺杂量x的增加,样品的铁磁性显著提高.当x为0.1时,样品具有较好的的铁磁特性.这可以理解为Sm3+、Co3+的掺杂,破坏BiFeO3样品中原有的反铁磁结构,形成一种新的亚铁磁结构,导致掺杂Co3+的样品磁性大幅度增强.

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