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Synthesis, Crystal Structure and Properties of Ag 4 CuTeO 6
Author(s) -
Klein Wilhelm,
Curda Jan,
Jansen Martin
Publication year - 2007
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200600292
Subject(s) - octahedron , antiferromagnetism , crystal structure , crystallography , paramagnetism , stoichiometry , materials science , magnetic moment , oxide , magnetic susceptibility , electrical resistivity and conductivity , condensed matter physics , chemistry , physics , metallurgy , quantum mechanics
The new quaternary oxide Ag 4 CuTeO 6 has been obtained by solid state reaction starting from stoichiometric amounts of the binary oxides at elevated temperatures and oxygen pressures. Ag 4 CuTeO 6 crystallises in space group C 2/ c with a = 11.3021(8), b = 9.6875(6), c = 5.7082(5) Å, β = 99.301(7)°, V = 616.77(8) Å 3 , Z = 4; the structure refinement was based on 747 independent reflections and resulted in R 1 = 3.26 %, wR 2 = 7.29 %. The crystal structure consists of isolated TeO 6 octahedra which are connected by distorted CuO 4 squares, thus forming one‐dimensional, infinite heteropolyanions, extending along the c axis. According to the approximately fcc packing and a distorted octahedral oxygen environment of all the cations, the structure may be regarded a derivative of the NaCl structure type. Ag 4 CuTeO 6 is paramagnetic between 300 K and 7 K, where it develops antiferromagnetic ordering. An evaluation according to the Curie‐Weiss law yielded a magnetic moment of 1.86 μ B per copper ion. The electronic conductivity shows a maximum at ∼ 75 K, below a temperature characteristic of a semiconductor, above of a metal.