Ukrainian Journal of Physical Optics 

Number  2, Volume 5,  2004

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Studies of Phase Transition Sequence in (C3H7NH3)2CuCl4 Crystals 
1Kushnir O., 1Shopa R.,2Girnyk I., 1Polovynko I.

1Electronics Department, L'viv National University, 107 Tarnavskii Str., 79017 L'viv, Ukraine
2Institute of Physical Optics, 23 Dragomanov Str., 79005 L'viv, Ukraine

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Using the Senarmont polarimeter and the quartz dilatometer, temperature dependences of optical bi-refringence and thermal expansion of (C3H7NH3)2CuCl4 crystals are studied. The temperature positions and characteristics of the phase transitions are discussed and the structure-defect interaction effects in incommensurate g phase are revealed.

Key words: phase transitions, incommensurate phases, birefringence, thermal expansion.
PACS: 78.20Ci; 64.70R; 07.60

doi 10.3116/16091833/5/2/61/2004
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