Synthesis and Structure of a New Germanate Fluoride: NaCa₂GeO₄F

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In this Subject: <a title="Chemistry (General)" href="/content/subcat?j_subject=166&j_availability=">Chemistry (General)
By this author: Schneemeyer L.F. ;&nbsp; Guterman L. ;&nbsp; Siegrist T. ;&nbsp; Kowach G.R.

Authors: Schneemeyer L.F.; Guterman L.; Siegrist T.; Kowach G.R.

Source: Journal of Solid State Chemistry, Volume 160, Number 1, August 2001 , pp. 33-38(6)

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Abstract:

We report the synthesis and structural characterization of a new oxoanion halide, NaCa₂GeO₄F. Crystal data: FW=235.74, Pnma (No. 62), orthorhombic, a=5.362(2), b=7.328(3), c=12.681(4) Å, V=498.3(3) Å³, Z=4, R(F)=0.044, R_w(F)=0.046 for 404 averaged reflections. Compositionally, this material can be viewed as the end-member of the hypothetical solid solution Ca₂GeO₄ sdot (CaO)_1-x sdot (NaF)_x. However, in this unusual oxyfluoride, the fluoride ion orders and fully occupies one anion site. The structure consists of complicated condensed chains of six-coordinated cations centered by fluoride ions and linked by chains of isolated germanium oxide tetrahedra. The structure is best described in terms of the anion packing rather than the packing of cation-centered coordination polyhedra. Copyright 2001 Academic Press.