Pyroelectric properties and electrical conductivity in samarium doped BiFeO 3 ceramics

Y. B. Yao, W. C. Liu, Chee Leung Mak

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)

Abstract

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 μC/m2K as the Sm3+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 Sm3+doping level. On the other hand, the magnetic Néel temperature (TN) 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.
Original languageEnglish
Pages (from-to)157-162
Number of pages6
JournalJournal of Alloys and Compounds
Volume527
DOIs
Publication statusPublished - 25 Jun 2012

Keywords

  • BiFeO 3
  • Pyroelectric
  • Sm doping 3+

ASJC Scopus subject areas

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

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