Anisotropy of the Refractive Indices and Thermal Expansion Coefficients of Rb2ZnCl4 Crystals
| Autor: | V. B. Stakhura, V. Yo. Stadnyk, Z. A. Kogut, B. V. Andrievskii |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Phase transition Materials science Condensed matter physics Physics::Optics General Chemistry 010403 inorganic & nuclear chemistry Condensed Matter Physics 01 natural sciences Landau theory Thermal expansion 0104 chemical sciences 0103 physical sciences General Materials Science Critical index Anisotropy Value (mathematics) Refractive index Optical path length |
| Zdroj: | Crystallography Reports. 63:1167-1172 |
| ISSN: | 1562-689X 1063-7745 |
| DOI: | 10.1134/s1063774518070234 |
| Popis: | The temperature dependences of the optical path difference ∆і(Т) and relative changes δlі/lі in the thickness of Rb2ZnCl4 crystals have been studied. The temperature dependences of the relative changes in the refractive indices δnі/(nі – 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 Аn – 1(Т) are calculated. A characteristic minimum near the phase transition temperature is found in these dependences. |
| Databáze: | OpenAIRE |
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