TY - JOUR
T1 - Phase stability and Landau phenomenological model of relaxor ferroelectric single crystals 0.78Pb(Mg1/3Nb2/3)O3-0.22PbTiO3
AU - Lu, Xiaoyan
AU - Fan, Jinhui
AU - Zhang, Hangbo
AU - Wu, Huaping
AU - Li, Hui
AU - Cao, Wenwu
N1 - Funding Information:
We appreciate the support by the National Key Research and Development Program of China (No. 2018YFC0705601 ), the National Science Foundation of China (No. 11872019 ), the Joint Guidance Project of Natural Science Foundation of Heilongjiang Province (No. LH2020A006 ) and the supporting of Heilongjiang Touyan Team program .
Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/4/1
Y1 - 2021/4/1
N2 - Relaxor-based ferroelectric single crystal with lower PbTiO3 content has complex phase transitions and mixed ferroelectric and relaxor characteristics, making it very challenging for the construction of Landau free energy expansion crucially used for theoretical investigation of this system. In this work, relaxor behavior in 0.78Pb(Mg1/3Nb2/3)O3-0.22PbTiO3 (PMN-0.22PT) single crystals was well suppressed through careful experimental design, leaving preserved single domain state for the Landau parameter extraction in this rhombohedral-phase composition. Using these extracted Landau free energy expansion parameters, energy profile and phase coexistence were theoretically studied and compared with those of PMN-0.30PT and PMN-0.36PT single crystals. Results show that rhombohedral phase dominates in PMN-0.22PT, and tetragonal phase dominates in PMN-0.36PT around room temperature. While, rhombohedral phase and tetragonal phase coexist in MPB composition PMN-0.30PT with small discrepancy of both free energies and polarization vectors.
AB - Relaxor-based ferroelectric single crystal with lower PbTiO3 content has complex phase transitions and mixed ferroelectric and relaxor characteristics, making it very challenging for the construction of Landau free energy expansion crucially used for theoretical investigation of this system. In this work, relaxor behavior in 0.78Pb(Mg1/3Nb2/3)O3-0.22PbTiO3 (PMN-0.22PT) single crystals was well suppressed through careful experimental design, leaving preserved single domain state for the Landau parameter extraction in this rhombohedral-phase composition. Using these extracted Landau free energy expansion parameters, energy profile and phase coexistence were theoretically studied and compared with those of PMN-0.30PT and PMN-0.36PT single crystals. Results show that rhombohedral phase dominates in PMN-0.22PT, and tetragonal phase dominates in PMN-0.36PT around room temperature. While, rhombohedral phase and tetragonal phase coexist in MPB composition PMN-0.30PT with small discrepancy of both free energies and polarization vectors.
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U2 - 10.1016/j.ceramint.2020.12.125
DO - 10.1016/j.ceramint.2020.12.125
M3 - Article
AN - SCOPUS:85098549024
SN - 0272-8842
VL - 47
SP - 9842
EP - 9848
JO - Ceramics International
JF - Ceramics International
IS - 7
ER -