Abstract
CuSbTeO 3Cl 2 has been isolated during an investigation of the system Cu 2O:TeCl 4:Sb 2O 3:TeO 2. The new compound is light yellow and crystallises in the monoclinic system, space group C2/ m, a=20.333(5) Å, b=4.0667(9) Å, c=10.778(2) Å, Z=6. The structure is layered and is built up from corner and edge sharing [(Sb,Te)O 4E] trigonal bipyramids that have the lone pair (E) directed towards one of the equatorial positions, those groups build up [(Sb,Te) 2O 3E 2 +] n layers. The copper and the chlorine atoms are located in between those layers. There are two different Cu positions. The [Cu1Cl 4] group is a slightly distorted tetrahedron and these tetrahedra make up chains by corner sharing. The electron density for the half occupied Cu2 atom is spread out in the structure like a worm that run along the b-axis in the space in between two chains of [Cu1Cl 4] tetrahedrons. Analysis of the diamagnetic response in magnetic susceptibility measurements is in perfect agreement with a Cu + valence. Conductivity measurements in the temperature range 355–590 K gives an activation energy of 0.55 eV. The delocalised Cu2 position in the structure suggests that the compound is a Cu + ionic conductor along the b-axis.
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