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Structure and refractive properties of LiNaSO4 single crystals

1,2Shchepanskyi P.A., 3Kushnir O.S., 1Stadnyk V.Yo., 1Brezvin R.S. and 4Fedorchuk A.O.

1Physics Faculty, Ivan Franko National University of Lviv, 19 Dragomanov Street,   79005 Lviv, Ukraine 2Institute of Physics, J. Dlugosh University in Czestochowa, Armii Krajowej 13/15,   PL-42-201, Czestochowa, Poland
3Faculty of Electronics and Computer Technologies, Ivan Franko National   University of Lviv, 107 Tarnavsky Street, 79017 Lviv, Ukraine
4Department of Inorganic and Organic Chemistry, Lviv National University of   Veterinary Medicine and Biotechnologies, 50 Pekarska Street, 79010 Lviv,   Ukraine
 

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Abstract. We report experimental results on the structure, refractive indices and birefringence of LiNaSO4 (LSS) crystals. Spectral behaviours of the refractive indices and the birefringence of LSS at the room temperature, as well as temperature and baric dependences of the birefringence are discussed. We examine the refractive indices and the birefringence using Sellmeier and Lorentz–Lorenz formulae and energy-band structure calculations. Unlike LiKSO4, the birefringence of LSS decreases with increasing temperature, while accidental optically isotropic states are absent under the normal conditions. A significant increase in the birefringence of LSS, if compared with LiKSO4, is assumed to be linked with asymmetry appearing in the local second-coordination environment of the LSS structure.

Keywords: lithium–sodium sulphate, ABSO4 crystals, structure, refractive indices, birefringence, optical anisotropy

PACS: 78.20.Ci, 78.20.Hp, 81.40.Vw
UDC: 535.323, 535.5, 535.012, 548.0
Ukr. J. Phys. Opt. 19: 141-149
doi: 10.3116/16091833/19/3/141/2018
Received: 14.04.2018

Анотація. У цій праці наведено експериментальні результати для структури, показників заломлення та подвійного променезаломлення (ПП) кристалів LiNaSO4 (ЛНС). Обговорено спектральну поведінку показників заломлення та ПП кристалів ЛНС за кімнатної температури, а також температурні та баричні залежності ПП. Показники заломлення описано на підставі формули Лорентц–Лоренца, спрощеної формули Зельмеєра і розрахунків енергетичної структури. На відміну від LiKSO4, ПП кристалів ЛНС зменшується зі зростанням температури, а випадкові стани оптичної ізотропії за нормальних умов відсутні. Значне зростання ПП ЛНС, порівняно з LiKSO4, пов’язано з асиметрією локального другого координаційного оточення в структурі ЛНС.
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