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ChemInform Abstract: Syntheses and Crystal Structures of Three Copper Tellurides: BaDyCuTe3, K1.5Dy2Cu2.5Te5, and Acentric K0.5Ba0.5DyCu1.5Te3.

✍ Scribed by F. Q. HUANG; W. CHOE; S. LEE; J. S. CHU

Publisher: John Wiley and Sons
Year: 2010
Weight: 36 KB
Volume: 29
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199832008

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✦ Synopsis

The title compounds are prepared by reaction of the elements at 850 • C with fluxes such as BaCl 2 or an eutectic mixture of LiCl/KCl. Single crystal XRD of all three compounds show tetrahedral structures based on CuTe 4 units. BaDyCuTe 3 crystallizes in the orthorhombic space group Cmcm with Z = 4, K 1.5 Dy 2 Cu 2.5 Te 5 is orthorhombic with space group Pmnn with Z = 4, and K 0.5 Ba 0.5 DyCu 1.5 Te 3 belongs to the orthorhombic space group Cmc 2 1 with Z = 4. While BaDyCuTe 3 contains infinite one-dimensional chains of tetrahedra with stoichiometry [CuTe 5-3 ]∞, the new phase K 0.5 Ba 0.5 DyCu 1.5 Te 3 forms a three-dimensional framework of tetrahedra. In K 1.5 Dy 2 Cu 2.5 Te 5 infinite chains of vertex-sharing [CuTe 5-3 ]∞ are present which form a three-dimensional network. -(HUANG, F. Q.;

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