Baric changes in refractive indices of K2ZnCl4 crystals

Autor:	V. Yo. Stadnyk, M. O. Romanyuk, Z. O. Kogut, B. V. Andrievsky
Rok vydání:	2010
Předmět:	Phase transition Materials science Condensed matter physics business.industry Dielectric Crystal structure Uniaxial pressure Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Stress (mechanics) Optics Polarizability Dispersion (optics) business Refractive index
Zdroj:	Optics and Spectroscopy. 108:753-760
ISSN:	1562-6911 0030-400X
DOI:	10.1134/s0030400x10050139
Popis:	The influence of uniaxial pressure applied along the principal crystallophysical directions on the dispersion and temperature dependences of the refractive indices n i of K2ZnCl4 crystals has been investigated. The n i values are found to be fairly sensitive to uniaxial pressure, whereas an uniaxial stress does not change the behavior of the dispersion and temperature dependences of n i . The baric changes in n i have been studied. The electronic polarizability α i , refractions R, and parameters of UV oscillators (λ0i , B 1i ) of mechanically deformed K2ZnCl4 crystals have been calculated. The contributions of UV and IR oscillators to n i (λ) have been estimated for different temperatures, spectral regions, and stresses. A significant baric shift of the points of the paraelectric phase-incommensurate phase-commensurate phase transitions to different temperature ranges, depending on the direction of pressure application, is found; this shift is due to the effect of uniaxial stress on the K2ZnCl4 crystal structure.
Databáze:	OpenAIRE
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