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Single crystals of Ba 2 Nb 2 TeO 10 ) have been prepared by solid state reactions in air. X-ray investigations led to orthorhombic symmetry, space group D 15  2h -Pbca, a = 7.242(4), b = 12.433(3), c = 9.932(3) Å. Z = 4. Nb 5+  and Te 6+  show octahedral coordination by O 2-  . The crystal structure is characterized by planes of edge- and corner-sharing NbO 6 - and TeO 6 octahedra. It is shown that in spite of nearly identical lattice constants of Ba 2 Nb 2 TeO 10  with compounds of the composition M 0,5 BaNbTe 2 O 9  the so far unknown crystals of these substances may not be derived from the Ba 2 Nb 2 TeO 10  type.

Zur Kenntnis eines Barium-Oxoniobat-Tellurats: Ba 2 Nb 2 TeO 10 / On a Barium-Oxoniobate-Tellurate: Ba 2 Nb 2 TeO 10