Pyroelectric properties and electrical conductivity in samarium doped BiFeO 3 ceramics

Yingbang Yao, Wenchao Liu, C. L. Mak

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)157-162
Number of pages6
JournalJournal of Alloys and Compounds
Volume527
DOIs
StatePublished - Jun 2012

ASJC Scopus subject areas

  • Materials Chemistry
  • Mechanics of Materials
  • Metals and Alloys
  • Mechanical Engineering

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