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A new alkaline earth vanadyl arsenate Ba(VO) 4 (AsO 4 ) 2 (As 2 O 7 ) has been synthesized by solid state reactions in closed quartz tubes. X-ray investigations led to orthorhombic symmetry, space group D 16  2h -Pnma, α = 17.540(2), b = 7.6223(8), c = 11.0633(12) Å, Z = 4. The crystal structure is characterized by AsO 4  single and As 2 O 7  double tetrahedra and face shared asymmetric stretched V 2 O 8+1 , double octahedra, forming a network of polyhedra. The incorporated Ba 2+  ions show 12-fold coordination by oxygen. Ba(VO) 4 (AsO 4 ) 2 (As 2 O 7 ) is the first vanadyl compound containing V 2 O 8  divanadyl groups originating from face sharing stretched VO 5+1  octahedra

zeitschrift für naturforschung b

Ba(VO) 4 (AsO 4 ) 2 (As 2 O 7 ): Ein neues Divanadyl(IV)-Arsenat mit flächenverknüpften V 2 O 8+1 -Oktaederdoppeln / Ba(VO) 4  (AsO 4 ) 2  (As 2 O 7 ): A New Divanadyl(IV)-Arsenate Containing Face Shared V 2 O 8+ , Double Octahedra