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K2In12Se19, a Complex New Structure Type Based on Icosahedral Units of Se2−

✍ Scribed by Marc Schlosser; Christof Reiner; Hans-Jörg Deiseroth; Lorenz Kienle

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
505 KB
Volume
2001
Category
Article
ISSN
1434-1948

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✦ Synopsis

K 2 In 12 Se 19 is a new ternary chalcogenide in the system K 2 Se-In 2 Se 3 (m.p. 997 K; colour: dark red) with the two components in a molar ratio of 1:6. This unusual solid shows a temperature-dependent order-disorder transition originating mainly from a dynamical disorder of In 3+ at elevated temperatures. The average structure of the dynamically disordered phase at 673 K was analysed by means of high-temperature single-crystal X-ray data [a = 1393.18(5) pm, c = 1772.26( 9) pm, Z = 3, R3 ¯, hexagonal setting]. The most prominent feature of the complex solid is a partial structure of slightly distorted icosahedra formed by Se1 (central atom), Se3, and Se4. The topological arrangement of the icosahedra corresponds to a cubic close packing. A further independent partial struc- [a] Anorganische Chemie,

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