Abstract
AbstractThe new quaternary oxide Ag4CuTeO6 has been obtained by solid state reaction starting from stoichiometric amounts of the binary oxides at elevated temperatures and oxygen pressures. Ag4CuTeO6 crystallises in space group C2/c with a = 11.3021(8), b = 9.6875(6), c = 5.7082(5) Å, β = 99.301(7)°, V = 616.77(8) Å3, Z = 4; the structure refinement was based on 747 independent reflections and resulted in R1 = 3.26 %, wR2 = 7.29 %. The crystal structure consists of isolated TeO6 octahedra which are connected by distorted CuO4 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.Ag4CuTeO6 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 μB per copper ion. The electronic conductivity shows a maximum at ∼ 75 K, below a temperature characteristic of a semiconductor, above of a metal.
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