Optical and Dilatometric Properties of (CH_{3})_{2}NH_{2}Al(SO_{4})_{2}·6H_{2}O Crystals in Paraelectric and Ferroelectric Phases

• Authors: D. Podsiadła , Z. Czapla , B. Andriyevsky , O. Myshchyshyn
• Languages of publication: EN

Abstracts

EN

Experimental investigation of the thermal linear expansion l(T) and temperature dependencies of the interference optical path difference D(T) were carried out for (CH_{3})_{2} NH_{2}Al(SO_{4})_{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} ≈ 150 K in ferroelectric phase. Relative temperature changes of the lengthening δl/l and refractive index δn/(n-1) are of the same order of magnitude. Peculiarities of temperature dependence of dilatometric and optical parameters of (CH_{3})_{2}NH_{2}Al(SO_{4})_{2}·6H_{2}O testify for qualitative reconstruction of chemical bonds in the crystal when temperature changes in the same phase.

Keywords

EN

64.70.Kb; 78.20.Fm

Discipline

• 78.20.Fm: Birefringence

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1999
• Volume: 96
• Issue: 3-4
• Pages: 409-416

Dates

published

1999-09

received

1999-03-22

Contributors

author

D. Podsiadła

• Institute of Experimental Physics, University of Wroclaw, Pl. M. Borna 9, 50-204 Wroclaw, Poland

author

Z. Czapla

• Institute of Experimental Physics, University of Wroclaw, Pl. M. Borna 9, 50-204 Wroclaw, Poland

author

B. Andriyevsky

• Faculty of Physics, Ivan Franko State University of L'viv, 8 Kyryla and Mefodiya Str., 290005 L'viv, Ukraine

author

O. Myshchyshyn

• Faculty of Physics, Ivan Franko State University of L'viv, 8 Kyryla and Mefodiya Str., 290005 L'viv, Ukraine

Identifiers

DOI

10.12693/APhysPolA.96.409