Ukrainian Journal of Physical Optics 

Number  2, Volume  1, 2000
Other articles in this issue
The domain structure of the Rb2Cd2(SO4)3 and Tl2Cd2(SO4)3 langbeinite crystals 
 2. The domain structure in the ferroelectric-ferroelastic phases of the Rb2Cd2(SO4)3 crystals

Vlokh R., Skab I., Girnyk I., *Czapla Z., *Dacko S., *Kosturek B.

Institute of Physical Optics, 79005, 23 Dragomanov Str., Líviv, Ukraine
*Institute of Experimental Physics, Wroclaw University, 9 M.Born Sq., Wroclaw,Poland

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The temperature behavior of the domain structure in the ferroelectric-ferroelastic phases of the Rb2Cd2(SO4)3 langbeinite crystals were investigated by the optical microscopy method. The new phase with the point group of symmetry 3 was found in the temperature region 130K<T<113K. By the observation of the domain structure in the temperature region 113K<T<101K the coexistence of the monoclinic and trigonal phase was revealed. The broad maximum of the dielectric permitivity measured at frequency 1MHz around T=Tc4=113K was found. This maximum significate that phase transition at Tc4 is the diffuse phase transition

Key words: Rb2Cd2(SO4)3 , langbeinite crystals, domain structure, dielectric permitivity, phase transition

doi: 10.3116/16091833/1/2/103/2000


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