CoTeMoO6, Co4TeMo3O16: Two new cobalt molybdotellurates

It has been found that a solid-state reaction of CoMoO₄ with TeO₂ at 500°C yields a new compound of the formula CoTeMoO₆. This compound is also formed in the course of annealing of CoMoO₄H₆TeO₆ mixtures. Another new compound, the cobalt molybdotellurate containing Te⁶⁺, was prepared by a solid-state reaction of Co₅TeO₈ with MoO₃. It has the formula Co₄TeMo₃O₁₆. Both CoTeMoO₆ and Co₄TeMo₃O₁₆ have been characterized by X-ray method. The latter has the structure of a wolframite type with the unit cell dimensions a = 4.66, b = 5.67, c = 4.96 Å, β ? 90°.