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Single crystals of Ba(BAsO 5 ) (I) and Ba 3 (AsO 4 ) 2  (II) were obtained by melting B 2 O 3 , arsenic pentoxide and BaO at 1100°C. Both compounds crystallize trigonally, space groups (I): C 3  2  - P3 1  (Nr. 144), (II): D 3d  5  - R3̄m (Nr. 166), with the lattice parameters (I): a = 726.7(1), c = 710.6(1) pm, Z = 3 and (II): a = 576.7(1), c = 2116.3(2) pm, Z = 3. Ba(BAsO 5 ) is isotypic to Pb(BAsO 5 ) (Stillwellite structure) and Ba 3 (AsO 4 ) 2  to Ba 3 (PO 4 ) 2 . The structure of Ba(BAsO 5 ) is characterized by helical chains of rings of two borate tetrahedra and one arsenate tetrahedron. Barium is tenfold coordinated by oxygen. A rod-like sequence of coordination polyhedra, AsO 4  -  Ba(2)O 10 -Ba(1)O 12 -Ba(2)O 10 -AsO 4  is characteristic in the crystal structure of Ba 3 (AsO 4 ) 2 .

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Zur Synthese und Kristallstruktur von Bariumboroarsenat Ba(BAsO 5 ) mit einem Beitrag über Bariumorthoarsenat Ba 3 (AsO 4 ) 2  / Synthesis and Crystal Structure of Barium Boroarsenate Ba(BAsO 5 ) with a Contribution on Barium Orthoarsenate Ba 3 (AsO 4 ) 2