Optical Properties of Langbeinites
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this article
R.Vlokh, O.V.Vlokh, I.Skab, I.Girnyk
The review paper is devoted to the collection and analysis of experimental
results obtained by different researches investigating the optical properties
of langbeinites. This investigation in general consists of the electrooptical
effect, optical activity, Raman scattering, crystallooptics of domains
and temperature studying of the birefringence. Langbeinites with their
simple structure and cubic symmetry could be model crystals for the development
of the microscopic theory of electrooptical effect and optical activity.
Most of the number of investigations concerning the domains configuration,
temperature behavior of birefringence and Raman scattering were conducted
in langbeinites because of quite an interesting and unusual sequence of
structural phase transitions in these crystals. It is shown in the present
paper that optical methods of investigations of phase transitions, particularly
in langbeinites, lead to obtaining important information on the change
of symmetry at phase transition, the temperature dependence of the order
parameter and lattice dynamics.
PACS: 42,33.SS-b.,77.80.B,78.20.Jq,78.30.-J
doi 10.3116/16091833/3/2/144/2002 |
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