MIXED OXIDES OF THE Cs(WNb)5O14 – STRUCTURE TYPE CONTAINING VANADIUM

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The invention relates to formula (1) mixed oxides with an orthorhombic structure of the Cs(WNb)5O1 type M1VpAqBrCsOn(1)whereby M represents one or several elements selected from the molybdenum and tungsten groups; V stands for vanadium; A stands for one or more elements selected from the niobium, tantalum, bismuth, phosphorus, zirconium, titanium, hafnium, gallium, chrome, iron, cobalt, aluminum, rhenium, manganese, ruthenium, germanium, indium, tin, boron and rare earth metals group; B stands for one or several elements selected from the alkaline metals, alkaline earth metals, thallium and zinc group; C stands for one or more elements selected from the palladium, platinum, gold, silver, rhodium, iridium, nickel and copper group; O stands for oxygen; 25 p, q, r, s and n each stands for the atomic proportions of M, V, A, B, C, and O with the stipulation that p = 0.001 to 2; q = 0 to 0.9; r = 0 to 0.2; 30 s = 0 to 0.1; and n signifies a number determined by the valence requirements of the existing elements.