Structural and dynamical aspects of structural phase transitions on incommensurate A2BX4 compounds

被引：1
|
作者：
Jorio, A [1 ]
Dantas, MSS
Speziali, NL
Pimenta, MA
Pinheiro, CB
Luk'Yanchuk, I
Saint-Grégoire, P
机构：
[1] Univ Fed Minas Gerais, Dept Fis, BR-30161 Belo Horizonte, MG, Brazil
[2] Univ Lausanne, Inst Chem, CH-1015 Lausanne, Switzerland
[3] Univ Picardie, Phys Mat Condensee Lab, F-80025 Amiens, France
[4] Univ Toulon & Var, Toulon, France
来源：
FERROELECTRICS | 2004年 / 305卷
关键词：
incommensurate; phase transition; Raman; infrared; DSC;
D O I：
10.1080/00150190490462432
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
At high temperature, the A(2)BX(4) crystals exhibit P6(3)/mmc structure. With temperature decreasing, a rich diagram of structural phases and phase transitions are observed, including different incommensurate phases. Ordering of the BX4 tetrahedra orientation in the unit cell drives the transitions, and they can be well described by an Ising model with competing interactions. Raman and infrared spectroscopy, differential scanning calorimetry (DSC) and thermogravimetry (TGA) are used to characterize the phase transitions in Cs2HgBr4 and Rb-2 WO4 crystals.
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页码：75 / 78
页数：4
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