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Influence of Cation Order on the Electric Field‐Induced Phase Transition in Pb(Mg 1/3 Nb 2/3 )O 3 ‐Based Relaxor Ferroelectrics
Author(s) -
Zhao Xiaohui,
Qu Weiguo,
He Hui,
Vittayakorn Naratip,
Tan Xiaoli
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00675.x
Subject(s) - ferroelectricity , electric field , dielectric , materials science , condensed matter physics , doping , phase diagram , phase transition , perovskite (structure) , transition temperature , phase (matter) , crystallography , chemistry , physics , superconductivity , optoelectronics , organic chemistry , quantum mechanics
The effect of cation ordering on an electric field‐induced relaxor to normal ferroelectric phase transition in Pb(Mg 1/3 Nb 2/3 )O 3 (PMN)‐based ceramics was investigated. Both A‐site La doping and B‐site Sc doping were found to enhance the chemical ordering in these relaxor ceramics. However, the enhanced chemical orderings showed different impacts on the dielectric and ferroelectric properties in these perovskite materials. The 5% La doping was observed to shift the dielectric maximum temperature ( T max ) to a significantly lower temperature and suppress the electric field‐induced transition to a ferroelectric phase. In contrast, the 5% and 10% Sc doping showed little effect on T max but strengthened the ferroelectric coupling. The difference is discussed on the basis of cation size and charge imbalance. An electric field‐temperature phase diagram is also proposed for the 0.90PMN–0.10Pb(Sc 1/2 Nb 1/2 )O 3 based on its history dependence of the electric field‐induced phase transition.