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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:
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.
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页码:362 / 371
页数:10
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