Ukrainian Journal of Physical Optics 

Number  4, Volume 3,  2002

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Optical Observation of Ferroelastic Domains in Cu6PS5X (X=I,Br,Cl) Crystals
Kaynts D.I., Studenyak I.P., Nebola I.I., Horvat A.A.

Institution for Solid State Physics and Chemistry, Uzhgorod National University, 46 Pidhirna St., Uzhgorod, 88000, Ukraine

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The ferroelectric-ferroelastic domain structure in Cu6PS5Br2 and  Cu6PS5I0.8Cl0.2 crystals is investigated using a polarizing microscope. Four types of domain walls are found. These domain walls separate at least six orientation states. The domain walls are classified as W and W` walls. The Cu6PS5I0.8Cl0.2 ferroelastic phase transition temperature point is detected on the base of birefringence temperature dependence.

Key words: ferroelastic and superionic crystals, domain structure.

PACS: 77.80Dj ; 42.25Lc

doi 10.3116/16091833/3/4/267/2002

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