Optical and dilatometric properties of (CH3)2NH2Al(SO4)2 •6H2O crystals in paraelectric and ferroelectric phases

被引：3
|
作者：
Podsiadla, D
Czapla, Z
Andriyevsky, B
Myshchyshyn, O
机构：
[1] Univ Wroclaw, Inst Expt Phys, PL-50204 Wroclaw, Poland
[2] Ivan Franko State Univ Lviv, Fac Phys, UA-290005 Lviv, Ukraine
来源：
ACTA PHYSICA POLONICA A | 1999年 / 96卷 / 3-4期
关键词：
D O I：
10.12693/APhysPolA.96.409
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Experimental investigation of the thermal linear expansion l(T) and temperature dependencies of the interference optical path difference D(T) were carried out for (CH3)(2)NH2Al(SO4)(2). 6H(2)O crystal, in the range of 120-310 K for three crystal physical directions. Decrease in electrostriction coefficients g of crystal was observed on approaching the phase transition point T-c approximate to 150 K in ferroelectric phase. Relative temperature changes of the lengthening delta l/l and refractive index delta n/(n - 1) are of the same order of magnitude. Peculiarities of temperature dependence of dilatometric and optical parameters of (CH3)(2)NH2Al/(SO4)(2). 6H(2)O testify for qualitative reconstruction of chemical bonds in the crystal when temperature changes in the same phase.
引用
收藏
页码：409 / 416
页数：8
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