Ukrainian Journal of Physical Optics

Number 3, Volume 3, 2002

Optical Properties of Langbeinites (II. Domain structure observation)
Vlokh R., Vlokh O.V., Skab I., Girnyk I.

Institute of Physical Optics, laboratory of gradient optics, polarimetry and phase transitions, 23 Dragomanov Str., 79005, Lviv, Ukraine

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The review paper is devoted to the collection and analyze of experimental results obtained by different researches that have been investigating the domain structure in langbeinites by optical microscopy method. These investigations in general consist of studying the domain structure in ferroelectrical langbeinites (NH4)2Cd2(SO4)3 and Rb2Cd2(SO4)3 and studying the “forbidden” domain walls in ferroelastical langbeinites - K2Cd2(SO4)3, K2Mn2(SO4)3 and solid solutions on their base as well as Tl2Cd2(SO4)3, K2Co2(SO4)3 ferroelastics. It was shown that “forbidden” domain walls should be considered as separate kind of thick (few tens of micrometers) walls that consist of the paraelastic phase layers. In a peculiar case of ferroelastic langbeinites these domain walls exist only due to the possibility of appearance high temperature phase (parent phase) with the point group of symmetry ?43m. The orientation of domain walls is discussed following from thermodynamic theory.

PACS: 42,33.SS-b.,77.80.B,78.20.Jq,78.30.-J

Keywords: langbeinites, domain structure, optical microscopy

doi 10.3116/16091833/3/3/215/2002

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