Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18505
Title: Structural transformation and ferroelectric-paraelectric phase transition in Bi1-x Lax FeO3 (x ≤ 0-0.25) multiferroic ceramics
Authors: Yuan, GL
Or, SW 
Chan, HLW 
Issue Date: 2007
Source: Journal of physics D : Applied physics, 2007, v. 40, no. 4, 043, p. 1196-1200 How to cite?
Journal: Journal of Physics D: Applied Physics 
Abstract: 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.
URI: http://hdl.handle.net/10397/18505
ISSN: 0022-3727
DOI: 10.1088/0022-3727/40/4/043
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