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Preparation and some properties of thallium orthothioarsenate single crystals
Author(s) -
Olexeyuk I. D.,
Babidorich P. I.,
Rez I. S.,
Voroshilov Yu. V.
Publication year - 1978
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19780130414
Subject(s) - thallium , orthorhombic crystal system , indentation hardness , materials science , crystallography , cleavage (geology) , analytical chemistry (journal) , chemistry , crystal structure , metallurgy , composite material , microstructure , chromatography , fracture (geology)
Growing of large (Ø 25–30 mm, L = 50–60 mm) optically homogenous single crystals of Tl 3 AsS 4 using the Bridgman‐Stockbarger method is described. Tl 3 AsS 4 is orthorhombic (Pnma), a = 8.85 ± 0.03, b = 10.86 ± 0.03, c = 9.18 ± 0.03 Å; z = 4; ϱ x = 6.15 g · cm −3 ; ϱ p = 6.15 ± 0,03 g · cm −3 , T m = 424 ± 3°C, Moh's hardness = 3, microhardness and ultrasonics velocity along x, y, z are 65–85 kg · mm −2 and 2.16 – 2.37 · 10 5 cm · sec −1 , respectively. The crystals possess perfect cleavage plane (010). Their transparency range is 0.6–12 microns. – Unsuccessful attempts to obtain Tl 3 AsS 4 and its alloys in the vitreous state were taken. The possibilities of glass formation and boundaries of the vitreous region in the system Tl–As–S based on the characteristic features of the melt forming structural units are analyzed.