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An X-Ray Study of the Polymorphism in Thallium Monosulfide: The Structure of Two Tetragonal Forms

✍ Scribed by S. Kashida; K. Nakamura

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 361 KB
Volume: 110
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1994.1168

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✦ Synopsis

Thallium monosulfidé is a mixed valence compound, as represented by the formula (\mathbf{T l}^{1} \mathrm{~T}^{1 \prime \prime} \mathrm{S}{2}). Two different structures with tetragonal symmetry are identified in TIS. The first is space group (14 / \mathrm{mcm}: a=b=7.785(2), c=6.802(2) \AA), and (Z=8) (the TISe type). The structure is characterized by chains formed of edgeconnected (\mathrm{Tl}^{\prime \prime \prime} \mathrm{S}{4}) tetrahedra. Monovalent (\mathrm{Tl}^{1}) ions are located between the chains and have eightfold antiprismatic coordination of the sulfir ions. The second is space group (P^{\prime} 4,2,2: a=b=7.803(9)), (c=29.55(2) A), and (Z=32). The structure is characterized by layers formed of corner-connected (\mathrm{Tl}^{\text {III }} \mathrm{S}_{4}) tetrahedra. Monovalent TI' ions are located between the layers and have sevenfold capped trigonal coordination of the sulfur ions. 1994 Academic Press, lnc.

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