Pyroelectric properties and electrical conductivity in samarium doped BiFeO 3 ceramics

Abstract
Samarium (Sm 3+) doped BiFeO 3 (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 μC/m 2 K as the Sm 3+ doping level increased from 1 mol% to 8 mol%. Temperature dependence of the pyroelectric coefficient showed an abrupt decrease above 80 °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 ∼0.7 eV for the conduction process was found to be irrespective of the Sm 3+ doping level. On the other hand, the magnetic Néel temperature (T N) decreased with increasing Sm 3+ 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. © 2011 Elsevier Ltd. All rights reserved.

Citation
Yao, Y. B., Liu, W. C., & Mak, C. L. (2012). Pyroelectric properties and electrical conductivity in samarium doped BiFeO3 ceramics. Journal of Alloys and Compounds, 527, 157–162. doi:10.1016/j.jallcom.2012.02.182

Acknowledgements
This work was supported by the Hong Kong Polytechnic University under Grant No. GYH08.

Publisher
Elsevier BV

Journal
Journal of Alloys and Compounds

DOI
10.1016/j.jallcom.2012.02.182

Permanent link to this record