Pressure-Induced Changes in Parameters of the Indicatrix of Lithium Sodium Sulfate Crystals


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Abstract

Spectral, temperature, and baric dependences of birefringence Δni of LiNaSO4 (LSS) crystals have been studied. It is established that dispersion Δn(λ) is anomalous. It is shown that uniaxial compression leads to changes in Δnі with different magnitudes and signs. The dispersion effect of changes in Δnі decreases under stress \(\sigma \, \bot \, z\) and increases in the opposite case (σ || z). Pressure-induced changes in the refractive index are estimated; it is established that the refractive indices of an LSS crystal increase under uniaxial compression, which may be related to compression of the crystal and change in its interatomic bond nature.

About the authors

V. Yo. Stadnyk

Ivan Franko National University of Lviv

Author for correspondence.
Email: vasylstadnyk@ukr.net
Ukraine, Lviv, 79005

P. A. Shchepanskyi

Ivan Franko National University of Lviv; Jan Dlugosz University in Częstochowa

Email: vasylstadnyk@ukr.net
Ukraine, Lviv, 79005; Częstochowa, 42200

R. S. Brezvin

Ivan Franko National University of Lviv

Email: vasylstadnyk@ukr.net
Ukraine, Lviv, 79005

M. Ya. Rudysh

Ivan Franko National University of Lviv; Jan Dlugosz University in Częstochowa

Email: vasylstadnyk@ukr.net
Ukraine, Lviv, 79005; Częstochowa, 42200

R. B. Matviiv

Ivan Franko National University of Lviv

Email: vasylstadnyk@ukr.net
Ukraine, Lviv, 79005

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