Structural and Phase Transitions in the High Composition Domain of the System (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3

被引：1
作者：
Wang, H. [1 ,2 ]
Laval, J. -P. [3 ]
Ehrenberg, H. [1 ,4 ]
Fuess, H. [1 ]
Arrii-Clacens, S. [5 ]
Luo, H. [6 ]
Elouadi, B. [7 ]
机构：
[1] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt, Germany
[2] CNRS, LAAS, F-31077 Toulouse 4, France
[3] Univ Limoges, Fac Sci, SPCTS, UMR 6638, F-87060 Limoges, France
[4] IFW Dresden, D-01069 Dresden, Germany
[5] Univ Poitiers, LACCO, F-86022 Poitiers, France
[6] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201800, Peoples R China
[7] Univ La Rochelle, LEACIM, F-17042 La Rochelle, France
来源：
FERROELECTRICS | 2010年 / 400卷
关键词：
SINGLE-CRYSTALS; RAMAN-SPECTROSCOPY; SOFT PHONON; PBTIO3;
D O I：
10.1080/00150193.2010.505857
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Raman scattering, dielectric studies, powder and single crystal X-ray diffraction on 0.6Pb(Mg1/3Nb2/3)O-3-0.4PbTiO(3) (PMN-40PT) and 0.55Pb(Mg1/3Nb2/3) O-3-0.45PbTiO(3) (PMN-45PT) were carried out over a wide temperature range. Dielectric plots of PMN-45PT revealed two phase transitions with a sharp maximum at T-C (paraelectric-ferroelectric transition at 485 K, from cubic to tetragonal with respective space groups Pm-3m and P4mm similar to PMN-40PT) and a second broad Raman shift at around 225 K. The Raman investigations confirmed the existence of phase transitions in PMN-45PT crystals, and the lowest frequency behaves like a soft mode. The appearance of diffuse scattering at room temperature in PMN-45PT suggests a phase distinct from PMN-40PT below T-C. The identification of the symmetry in this temperature region will be further demonstrated.
引用
收藏
页码：362 / 371
页数：10
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