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

A Franiv, O Kushnir, I Girnyk, V Franiv, I Kityk, M Piasecki, K Plucinski
2013 Ukrainian Journal of Physical Optics  
We report on the growth and initial thermal and optical characterisation of a single-crystalline ternary halide, Tl 4 CdI 6 . 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 widegap semiconductors. A
more » ... 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.
doi:10.3116/16091833/14/1/6/2013 fatcat:lz2mgqm5srbrdla5cbxiorz3fe