Anisotropy of the Refractive Indices and Thermal Expansion Coefficients of Rb2ZnCl4 Crystals

The temperature dependences of the optical path difference ∆ і ( Т ) and relative changes δ l і / l і in the thickness of Rb 2 ZnCl 4 crystals have been studied. The temperature dependences of the relative changes in the refractive indices δ n і /( n і  – 1) are calculated. The critical index of the...

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Bibliographic Details
Published in:Crystallography reports 2018, Vol.63 (7), p.1167-1172
Main Authors: Stadnyk, V. Yo, Andrievskii, B. V., Stakhura, V. B., Kogut, Z. A.
Format: Article
Language:English
Subjects:
Anisotropy
Crystallography and Scattering Methods
Crystals
Mathematical analysis
Phase transitions
Physical Properties of Crystals
Physics
Physics and Astronomy
Refractivity
Thermal expansion
Transition temperature
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Summary:The temperature dependences of the optical path difference ∆ і ( Т ) and relative changes δ l і / l і in the thickness of Rb 2 ZnCl 4 crystals have been studied. The temperature dependences of the relative changes in the refractive indices δ n і /( n і  – 1) are calculated. The critical index of the temperature changes in the refractive indices is estimated to be β = 0.31 ± 0.02, a value that is well consistent with the Landau theory of phase transitions. The coefficients of anisotropy of refractive indices А n   – 1 ( Т ) are calculated. A characteristic minimum near the phase transition temperature is found in these dependences.
ISSN:1063-7745
1562-689X
DOI:10.1134/S1063774518070234