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Temperature dependences of optical indicatrix and thermal expansion parameters of  TlIn(S1–xSex)2 solid solutions (x = 0, 0.02 and 0.06)

1Say A., 1Martynyuk-Lototska I., 1Mys O., 1Adamenko D., 1Kostyrko M., 1,2Gomonnai O. and 1Vlokh R.

1O.G. Vlokh Institute of Physical Optics, 23 Dragomanov Street, 79005 Lviv, Ukraine
2Uzhhorod National University, 46 Pidhirna Street, 88000 Uzhhorod, Ukraine

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Abstract. Temperature dependences of relative elongation, thermal expansion coefficient, birefringence increment and angle of optical indicatrix rotation are studied for TlIn(S1–xSex)2 crystals (x = 0, 0.02 and 0.06). We have found that all of these crystals reveal at least two diffused phase transitions (PTs), from normal phase to incommensurate phase and from incommensurate phase to ferroelectric phase. The temperature regions where these PTs take place are determined. A low-temperature PT represents a diffused PT of the first order. We have detected with our techniques that the solid solution with x = 0.02 is non-uniformly stressed. These internal stresses can be caused by a polytype structure. An additional anomaly in the temperature dependence of thermal expansion coefficient occurring at the temperature T1=214K in the compound with x = 0.06 also points to the existence of polytype structure.

Keywords: birefringence, optical indicatrix, thermal expansion, phase transitions, polytype structure, TlIn(S1–xSex)2 crystals

UDC: 535.012.2+544.015.3
Ukr. J. Phys. Opt. 21 57-64
doi: 10.3116/16091833/21/2/57/2020
Received: 04.03.2020

Анотація. Досліджено температурні залежності відносного теплового видовження, коефіцієнта теплового розширення, приросту подвійного оптичного заломлення та кута повороту оптичної індикатриси для кристалів TlIn(S1–xSex)2 (x = 0, 0,02 і 0,06). Показано, що ці кристали виявляють щонайменше два розмиті фазові переходи (ФП) – переходи з нормальної в неспівмірну фазу та з неспівмірної в сегнетоелектричну фазу. Встановлено температурні ділянки, де відбуваються ці ФП. Низькотемпературний ФП представляє собою розмитий ФП першого роду. На основі наших методик виявлено, що твердий розчин із x = 0,02 неоднорідно напружений. Ці внутрішні напруження можуть бути зумовлені політипною структурою. Додаткова аномалія на температурній залежності коефіцієнта теплового розширення, яка з’являється для сполуки з х = 0,06 за температури 
Т1=214К, також вказує на існування політипної структури.
 
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