Evidence for First Order Cubic Paraelectric to Rhombohedral Ferroelectric Phase Transition in 0.8BiFeO3-0.2Pb(Fe1/2Nb1/2)O3
Abstract
The current controversies about the existence of an intermediate 'beta' phase of BiFeO3 and the high temperature paraelectric 'gamma' phase are resolved by studying the sequence of ferroic transitions in 0.8BiFeO3-0.2Pb(Fe1/2Nb1/2)O3 (BF-0.2PFN) with lowered transition temperature. It is shown that the room temperature ferroelectric phase of 0.8BF-0.2PFN in the R3c space group transforms to the paraelectric/paraelastic cubic (Pm-3m) phase directly without any intermediate 'beta' phase reported in the literature. This transition is of first order type as confirmed by the coexistence of R3c and Pm-3m phases over a 100K range and a discontinuous change in the unit cell volume.
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