On the transition to the X-phase in highly brominated Betaine Calcium Chloride Dihydrate (BCCD)

被引：1
|
作者：
Vieira, LG [1 ]
Ribeiro, JL
Hernandez, O
Quilichini, M
Almeida, A
Chaves, MR
Klöpperpieper, A
机构：
[1] Univ Minho, Dept Fis, P-4709 Braga, Portugal
[2] CEA Saclay, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France
[3] Univ Porto, Fac Ciencias, Dept Fis, IMAT,IFIMUP, P-4169007 Porto, Portugal
[4] Univ Saarlandes, Fachbereich Phys, D-66200 Saarbrucken, Germany
来源：
FERROELECTRICS | 2000年 / 240卷 / 1-4期
关键词：
structural phase transitions; incommensurate phases; neutron scattering; birefringence; dielectric properties;
D O I：
10.1080/00150190008227967
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report dielectric and optical birefringence measurements in 38% brominated BCCD, which confirm the transition to the X-phase, at ambient pressure, around T-c=80 K. These results are compared with elastic neutron scattering data. A coexistence of the parent Pnma phase with the X-phase is observed in a large range of temperature centered at about T-c. It is found that the mosaic spread of the crystal varies strongly and irreversibly when a temperature cycle Pnma - X-phase - Pnma is performed. A 30% brominated BCCD has also been investigated by elastic neutron scattering. For this compound, an intermediate incommensurate phase occurring between T(1)approximate to 111 K and T(c)approximate to 50 K is observed.
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页码：1435 / 1442
页数：8
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