Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: C1.00278 : Monoclinic phase transition in stress-induced BiFeO3 epitaxial films
Author:
Material system near morphotropic phase boundary usually attracted
a lot of attention due to their unique physical properties. The key
issue of the mechanism is to reveal the coupling between the
multiple phases or the intermediate states during phase
transformation. Recently, highly-strained multiferroic BiFeO3 (BFO)
films had been reported to possess a particular isosymmetric
boundary between tetragonal(T) and rhombohedral(R) phases. In this
study, we investigated the as-grown state of mixed-phase BFO and
the evolution of phases under external stimulus. Through first
principle study and Raman measurement, we found the mixed phase BFO
films at room temperature included two monoclinic phases, MA(Cm)
and MC (Pm). When the temperature was increased to about 420 K, MC
phase transformed to a R-like phase. The MA and the R-like phase
coexisted until 620 K; after that, the R-like phase disappeared
while the MA lasted to higher temperatures. This result showed the
possible path of transition near the morphotropic phase boundary.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.C1.278
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