Dilatometric Investigations of Overcritical Behaviour in [N(C_{2}H_{5})_{4}]_{2}CuCl_{4} Crystals

• Authors: R. Poprawski , A. Liber , E. Małek
• Languages of publication: EN

Abstracts

EN

The results of experimental investigation of thermal expansion of [N(C_{2}H_{5})_{4}]_{2}CuCl_{4} crystals in a wide temperature range are presented. The anomaly of thermal deformation typical of first order phase transition at 258 K and additional continuous anomaly at 195 K were observed. It was shown that low temperature anomalies of physical properties of [N(C_{2}H_{5})_{4}]_{2}CuCl_{4} crystals can be described as overcritical trace of isomorphous phase transitions. Results of numerical analysis of phenomenological model of improper ferroelastic exhibiting isomorphous phase transitions are presented and compared with experimentally determined temperature dependencies of spontaneous deformation of [N(C_{2}H_{5})_{4}]_{2}Cu Cl_{4} crystals.

Keywords

EN

61.68.+n

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2000
• Volume: 98
• Issue: 1-2
• Pages: 61-70

Dates

published

2000-07

received

2000-02-23

Contributors

author

R. Poprawski

• Institute of Physics, Wrocław University of Technology Wybrzeze Wyspiańskiego 27, 50-370 Wrocław, Poland

author

A. Liber

• Computer Science Department, Wrocław University of Technology Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

author

E. Małek

• Institute of Physics, Wrocław University of Technology Wybrzeze Wyspiańskiego 27, 50-370 Wrocław, Poland