Abstract
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.
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Kurlyak, V.Y., Stadnyk, V.Y., Stakhura, V.B. et al. Birefringence of mechanically stressed Rb2ZnCl4 crystals. Crystallogr. Rep. 60, 929–934 (2015). https://doi.org/10.1134/S1063774515060164
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DOI: https://doi.org/10.1134/S1063774515060164