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Abstracts
Temperature dependences of the linear dimension L(T) and spontaneous polarization P_s(T) for triglycine sulphate and glycine posphite single crystals have been measured in the same run of temperature. A decrease in the spontaneous electrostriction coefficient Q_L of both crystals studied is displayed when approaching the corresponding phase transition point T_c. A temperature dependence of the coefficients Q_L(T) shows that the rates of temperature changes of displacement of the atomic complexes of corresponding crystal structure forming the square of spontaneous polarization P_s^2 (primary order parameter) and the displacements of all atomic complexes forming the spontaneous linear thermal expansionδ L_s/L (secondary order parameter) are different. The applying external electric field E=3×10 ^5 V/m to triglycine sulphate crystal does not influence essentially the temperature dependence of Q_L(T) in the temperature range of phase transition below T_c.
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593-600
Physical description
Dates
published
2001-05
received
2000-11-03
received
2001-02-05
Contributors
author
- The Ivan Franko National University of L'viv, 8 Kyrylo & Mefodii Str., 79005 L'viv, Ukraine
author
- The Ivan Franko National University of L'viv, 8 Kyrylo & Mefodii Str., 79005 L'viv, Ukraine
author
- Institute of Experimental Physics, University of Wrocław, 9 M. Born Sqr., 50-204 Wrocław, Poland
author
- Institute of Experimental Physics, University of Wrocław, 9 M. Born Sqr., 50-204 Wrocław, Poland
References
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Document Type
Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv99n507kz