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In the scope of providing new chemical insight of the oxidation states of copper and vanadium, crystal structures of VOB's  β′ -Cu  x  V 2 O 5  with  x  = 0.29, 0.47 and 0.59, have been carefully investigated. The structures are monoclinic, space group  C 2/ m , with  a  = 15.233(3) Å, 15.218(1) Å, 15.2007(7) Å,  b  = 3.6133(9) Å, 3.6271(6) Å, 3.6375(3) Å,  c  = 10.0927(9) Å, 10.087(8) Å, 10.0925(4) Å,  β  = 107.30(1) Å, 106.55(4) Å, 106.13(2)°,  R  = 0.0467, 0.0290, 0.0315.

Vanadium oxide bronzes – the double mixed valence phases Cu[unk]Cu[unk] (1− t ) V[unk] (2− t ) V[unk] (2− t ) O 5 A joint XRD and ESCA investigation