Crystal structures of Ca5Ge3O11 and wollastonite-type GaGeO3
Abstract
The crystal structures of triclinic Ca5Ge3O11 and triclinic wollastonite-type CaGeO3 have been determined by X-ray diffraction using single crystals grown from a K2MoO4 flux. Ca5Ge3O11 is closely related to monoclinic Ca5(Ge,Si)3O11 and crystallizes in the C[unk] space group with the cell parameters: a = 10.855(2) Å, b = 8.715(2) Å, c = 10.998(2) Å, α = 90.60(3)°, β = 96.49(3)°, γ = 90.17(3)°, Z = 4, wR(F2) = 0.080 for 4877 unique reflections. Ca5Ge3O11 is a mixed-anion germanate containing single and double tetrahedra, with a structural formula written as Ca5[GeO4] [Ge2O7]. CaGeO3 is isostructural with CaSiO3, wollastonite-1T, and crystallizes in the P[unk] space group with the cell parameters: a = 7.269(2) Å, b = 7.526(2) Å, c = 8.094(2) Å, α = 103.44(3)°, β = 94.42(3)°, γ = 90.11(3)°, Z = 6, wR(F2) = 0.074 for 9279 unique reflections. The CaGeO3 structure contains tetrahedral dreier single chains corresponding to the structural formula Ca3{uB∞1}[Ge3O9]. The bonding in the two compounds is analyzed in terms of a comparison between observed bond valences and bond valences predicted from the bond topology.
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Articles in the same Issue
- Icosahedral coincidence rotations
- Localization and integration of diffraction spots from two-dimensional X-ray detector images by digital filtering
- Finite periodicity and crystal structures
- Structure determination from powder data using anomalous scattering: difference and partial, Patterson densities, and phases of structure factors
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- One-dimensional staircase aggregates in crystals of 1,7-bis(dimethylamino)heptamethinium hexafluorophosphate, a polymethine dye
- Crystal structures of N-4-methyl phenyl)-2,2,2-trichloroacetamide, N-2,3-dimethyl phenyl)-2,2,2-trichloroacetamide and N-(2-nitro phenyl)-2,2,2-trichloroacetamide
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- Structural variations in the mercury(II) bis(1,1-dithiolate)s: the crystal and molecular structure of [Hg(S2CNMe2)2]
