Pyroelectric properties and electrical conductivity in samarium doped BiFeO₃ ceramics

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• 作者：Y.B. Yao^a ; ^b ; W.C. Liu^a ; ^c ; C.L. Mak^a ; ^{apaclmak@polyu.edu.hk}
• 关键词：BiFeO3 ; Pyroelectric ; Sm3+ doping
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：25 June, 2012
• 卷：527
• 期：Complete
• 页码：157-162
• 文件大小：1452 K

摘要

Samarium (Sm³⁺) doped BiFeO₃ (BFO) ceramics were prepared by a modified solid-state-reaction method which adopted a rapid heating as well as cooling during the sintering process. The pyroelectric coefficient increased from 93 to 137 渭C/m² K as the Sm³⁺ doping level increased from 1 mol%to 8 mol%. Temperature dependence of the pyroelectric coefficient showed an abrupt decrease above 80 掳C in all samples, which was associated with the increase of electrical conductivity with temperature. This electrical conduction was attributed to oxygen vacancy existing in the samples. An activation energy of 鈭?.7 eV for the conduction process was found to be irrespective of the Sm³⁺ doping level. On the other hand, the magnetic N茅el temperature (T_N) decreased with increasing Sm³⁺ doping level. On the basis of our results, the effects of Sm doping level on the pyroelectric and electrical properties of the BFO were revealed.