Birefringence of mechanically stressed Rb2ZnCl4 crystals
| Autor: | V. B. Stakhura, V. Yu. Kurlyak, V. Yo. Stadnyk, Z. O. Kohut |
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| Rok vydání: | 2015 |
| Předmět: |
Phase transition
Materials science Birefringence Condensed matter physics Annealing (metallurgy) Physics::Optics General Chemistry Dielectric Condensed Matter Physics Uniaxial pressure Crystal Condensed Matter::Materials Science Crystallography Condensed Matter::Superconductivity General Materials Science |
| Zdroj: | Crystallography Reports. 60:929-934 |
| ISSN: | 1562-689X 1063-7745 |
| DOI: | 10.1134/s1063774515060164 |
| Popis: | The spectral and temperature dependences of the birefringence of mechanically free and uniaxially stressed Rb2ZnCl4 crystals have been investigated. It is shown that annealing a crystal leads to step changes in the birefringence at the phase transition from the incommensurate to commensurate phase, whereas the birefringence of as-prepared crystals changes continuously. It is established that the birefringence of Rb2ZnCl4 crystal is sensitive to uniaxial pressure; however, uniaxial stress does not change the character of its dispersion and temperature dependences. A new “pseudoisotropic” state of this crystal and a baric shift of the points of paraelectric phase–incommensurate phase–commensurate phase transitions to different temperature regions are found. |
| Databáze: | OpenAIRE |
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