The crystal structure of FeInGe2O7
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J. Bucio
Abstract
A new iron indium germanate has been prepared as polycrystalline powder material which crystallizes in the monoclinic system (S.G. C2/m, No. 12). The structure was characterized by X-ray powder diffraction and Rietveld refinement of the resulting diffraction pattern. The cell parameters are a = 6.5124(4) Å, b = 8.5914(5) Å, c = 4.8936(3) Å, β = 102.683(2)°, V = 267.12(3) Å3 and Z = 2. The structure contains R+3 cations (R=Fe, In) almost equally distributed in distorted RO6 octahedral sites. These octahedra are joined by edge sharing forming a hexagonal arrangement on the ab planes. The RO6 octahedra layers are held together by sheets of isolated Ge2O7 diorthogroups constituted by a double tetrahedra sharing a common vertex. This compound has the thortveitite structure and keeps a strong relationship with the FeYGe2O7 germanate, which presents two R+3 sites with six-coordinated (R=Fe) and seven-coordinated (R=Y) oxygens, corresponding to the different symmetry given by the monoclinic space group P21/m (No. 11)
© 2001 Oldenbourg Wissenschaftsverlag GmbH
Articles in the same Issue
- In situ structure solution of helical sulphur at 3GPa and 400ºC
- Phonon dispersion curves by inelastic neutron scattering to 12 Gpa
- Self-intersecting three-periodic minimal surfaces forming one-periodic tubes or finite polyhedra
- The crystal structure of FeInGe2O7
- Crystal structure of kristiansenite: a case of class IIB twinning by metric merohedry
- The crystal structures of phenacite-type Li2(MoO4), and scheelite-type LiY(MoO4)2 and LiNd(MoO4)2
- A synchrotron X-ray diffraction analysis of near-stoichiometric LiNbO3
- Polymorphism and multiple twinning of (Et4N)2ZnCl4
- Prediction of crystal structure of a rare monosaccharide – influence of model geometry
Articles in the same Issue
- In situ structure solution of helical sulphur at 3GPa and 400ºC
- Phonon dispersion curves by inelastic neutron scattering to 12 Gpa
- Self-intersecting three-periodic minimal surfaces forming one-periodic tubes or finite polyhedra
- The crystal structure of FeInGe2O7
- Crystal structure of kristiansenite: a case of class IIB twinning by metric merohedry
- The crystal structures of phenacite-type Li2(MoO4), and scheelite-type LiY(MoO4)2 and LiNd(MoO4)2
- A synchrotron X-ray diffraction analysis of near-stoichiometric LiNbO3
- Polymorphism and multiple twinning of (Et4N)2ZnCl4
- Prediction of crystal structure of a rare monosaccharide – influence of model geometry
