Dielectric and Birefringent Properties of [(CH_3)_2NH_2]_5Cd_2CuCl_{11} Solid Solutions in the Region of Their Phase Transitions

• Authors: Yu Eliyashevskyy , V Kapustianyk , S Dacko , Z Czapla , A Batiuk , S Sveleba
• Languages of publication: EN

Abstracts

EN

On the basis of the optical and dielectric investigations of [(CH_3)_2NH_2]_5Cd_2CuCl_{11} solid solutions the existence of phase transitions at T_1=175 K and T_2=117.5 K was confirmed. Both phase transitions were found to be shifted toward lower temperatures with respect to the corresponding transitions in the "host" [(CH_3)_2NH_2]_5Cd_3Cl_{11} crystals. It was found that the proton conductivity in [(CH_3)_2NH_2 ]_5Cd_2CuCl_{11} crystals is realized through the Grotthus mechanism. The investigations of the birefringent properties confirmed existence of the structural changes at T_0=320 K connected with the complex co-operative effect involving weakening of the hydrogen bonds and modification of the Jahn-Teller distortion with temperature.

Keywords

EN

65.40.-b; 77.22.Ch

Discipline

• 65.40.-b: Thermal properties of crystalline solids
• 77.22.Ch: Permittivity (dielectric function)(for low-permittivity dielectric films, see 77.55.Bh; for high-permittivity gate dielectric films, 77.55.D-)

• Journal: Acta Physica Polonica A
• Year: 2006
• Volume: 109
• Issue: 2
• Pages: 171-178

Dates

published

2006-02

received

2005-06-06

(unknown)

2005-10-10

(unknown)

2005-11-29

Contributors

author

Yu Eliyashevskyy

• Institute of Experimental Physics, University of Wrocław, pl. M. Borna 9, 50-204 Wrocław, Poland

author

V Kapustianyk

• Lviv Ivan Franko National University, Scientific-Technical and Educational Center of Low Temperature Studies, Dragomanova St. 50, 79005, Lviv, Ukraine

author

S Dacko

• Institute of Experimental Physics, University of Wrocław, pl. M. Borna 9, 50-204 Wrocław, Poland

author

Z Czapla

• Institute of Experimental Physics, University of Wrocław, pl. M. Borna 9, 50-204 Wrocław, Poland

author

A Batiuk

• Lviv Ivan Franko National University, Scientific-Technical and Educational Center of Low Temperature Studies, Dragomanova St. 50, 79005, Lviv, Ukraine

author

S Sveleba

• Lviv Ivan Franko National University, Scientific-Technical and Educational Center of Low Temperature Studies, Dragomanova St. 50, 79005, Lviv, Ukraine

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Identifiers

DOI

10.12693/APhysPolA.109.171