Structural transformation and ferroelectric-paraelectric phase transition in Bi1-x Lax FeO3 (x ≤ 0-0.25) multiferroic ceramics

G. L. Yuan, Siu Wing Or, Helen Lai Wa Chan

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Bi1-xLaxFeO3 (x ≤ 0-0.25) multiferroic ceramics were prepared to study the compositional driven structural transformation and ferroelectric- paraelectric phase transition. Rietveld-refined crystal structure parameters revealed the existence of a rhombohedral R3c symmetry in BiFeO3, a triclinic P1 symmetry in Bi0.95La0.05FeO3, Bi0.9La 0.1FeO3 and Bi0.85La0.15FeO 3, a pseudotetragonal P4mm symmetry in Bi0.8La 0.2FeO3 and a pseudotetragonal P4/mmm symmetry in Bi 0.75La0.25FeO3. La substitution led to the ferroelectric-paraelectric phase transition accompanying abrupt changes of Raman scattering spectra in Bi0.8La0.2FeO3 and Bi0.75La0.25FeO3, besides the release of weak ferromagnetism in Bi0.85La0.15FeO3, Bi 0.8La0.2FeO3 and Bi0.75La 0.25FeO3. Ferroelectricity with remnant polarization of >9.8 νC cm-2 and piezoelectricity with d33 coefficient of >25 pC/N were confirmed in all compositions except for Bi 0.75La0.25FeO3.
Original languageEnglish
Article number043
Pages (from-to)1196-1200
Number of pages5
JournalJournal of Physics D: Applied Physics
Issue number4
Publication statusPublished - 21 Feb 2007

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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