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Growth, crystal structure, thermal properties and optical anisotropy of Tl4CdI6 single crystals

Franiv A. V., Kushnir O. S., Girnyk I. S., Franiv V. A., Kityk I., Piasecki M. and Plucinski K. J. 

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Abstract. We report on the growth and initial thermal and optical characterisation of a single-crystalline ternary halide, Tl4CdI6. The crystal is described by the centrosymmetric tetragonal class P4/mnc at the room temperature. The parameters of linear thermal expansion are studied in the temperature region 330–500 K. The crystal is optically positive and reveals very high optical anisotropy (the birefringence ~ 0.13 at 633 nm). Its optical pseudo-gap value corresponds to wide-gap semiconductors. A broad maximum at 400–410 K found in the temperature dependence of IR radiation-induced second harmonic generation may be indication of a polymorphic phase transformation.

Keywords: ternary halide crystals, А4ВХ6, thermal expansion, inversion centre, optical anisotropy, second harmonic generation, phase transformations 

PACS: 42.65.Ky, 61.10.Nz, 61.66.Fn, 64.70.Kb, 65.70.+y, 78.20.Fm
UDC: 548.0, 535.5 
Ukr. J. Phys. Opt. 14 6-14
doi: 10.3116/16091833/14/1/6/2013
Received: 17.11.2012

Анотація. Ми повідомляємо про вирощування та результати попередньої термічної та оп-тичної характеризації монокристалічного тернарного галоїду Tl4CdI6. За кімнатної темпе-ратури кристали описуються центросиметричним тетрагональним класом P4/mnc. Вивчено параметри лінійного термічного розширення в діапазоні 330–500 К. Кристали оптично до-датні і виявляють дуже високу оптичну анізотропію (подвійне заломлення ~ 0.13 при 633 нм). Величина їхньої оптичної псевдощілини відповідає широкозонним напівпровідникам. Широкий максимум при 400–410 К, знайдений у температурній залежності генерації другої гармоніки, індукованої ІЧ-випромінюванням, може вказувати на наявність поліморфного фазового пе-ретворення.
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