Simultaneous Pyroelectric and Dilatometric Studies of Phase Transitions in Triglycine Sulphate and Glycine Posphite Crystals

• Authors: B. Andriyevsky , V. Kardash , S. Dacko , Z. Czapla
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

77.80.Bh

• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 99
• Issue: 5
• Pages: 593-600

Dates

published

2001-05

received

2000-11-03

received

2001-02-05

Contributors

author

B. Andriyevsky

• The Ivan Franko National University of L'viv, 8 Kyrylo & Mefodii Str., 79005 L'viv, Ukraine

author

V. Kardash

• The Ivan Franko National University of L'viv, 8 Kyrylo & Mefodii Str., 79005 L'viv, Ukraine

author

S. Dacko

• Institute of Experimental Physics, University of Wrocław, 9 M. Born Sqr., 50-204 Wrocław, Poland

author

Z. Czapla

• Institute of Experimental Physics, University of Wrocław, 9 M. Born Sqr., 50-204 Wrocław, Poland

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Identifiers

DOI

10.12693/APhysPolA.99.593