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Synthesis and Characterization of Se4Nb2O13:  A New Ternary Se4+−Nb5+−Oxide with Monoselenite and Diselenite Groups

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posted on 1998-01-22, 00:00 authored by P. Shiv Halasyamani, Dermot O'Hare
A new noncentrosymmetric ternary selenite, Se4Nb2O13, has been synthesized from SeO2 and Nb2O5. Crystal data:  Se4Nb2O13, Mr = 709.64, monoclinic, space group Pa (No. 7), a = 7.555(6) Å, b = 6.637(8) Å, c = 11.377(5) Å, β = 109.23(3)°, V = 538.64(2) Å3 (T = 200 K), Z = 2, R(F) = 6.44%, Rw(F) = 7.12%. The compound consists of rows of corner-linked NbO6 octahedra that are also connected through monoselenite, SeO3, and diselenite, Se2O5, groups.

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