Crystal structure determination of systematically intergrown compounds: Li5(OH)2Br3 and Li2(OH)Br
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K. Friese
Abstract
We carried out a structure refinement of a crystal which was composed of two phases. Phase I was up to now unknown and corresponds to Li5(OH)2Br3 with lattice parameters a = 4.02335(1), c = 21.5638(1) Å, space group I4̅m2. Phase II is Li2(OH)Br with lattice parameters a = 4.04594(3) Å and space group Pm3̅m. The two phases have the a, b-plane in common and consequently part of the reflections overlap systematically. We performed a joint structure refinement of the two phases taking into account all reflections. The structure of Li5(OH)2Br3 is characterized by anti-perovskite like double layers of composition 2 × Li2(OH)Br, which alternate with rock-salt like layers of composition LiBr. Results for Li2(OH)Br are in good agreement with literature and confirm the correctness of the underlying model and the usefulness of the method employed in structure refinement.
© 2003 Oldenbourg Wissenschaftsverlag GmbH
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Artikel in diesem Heft
- Strukturverwandtschaft durch Streckung in Richtung von Symmetrieachsen
- Electron crystallography of zeolites. 2. Mordenite and the role of secondary scattering on structure determination
- Rietveld refinement of incommensurate low tridymite
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- Wickenburgite, a double-layer silicate Pb3Al[6][Ca[6]Al[4]Si[4]10O27(H2O)3]·H2O: Crystal chemistry and thermal behaviour
- Natural and synthetic compounds with kröhnkite-type chains. An update
- Geometrical isomerism in uranyl chromates I. Crystal structures of (UO2)(CrO4)(H2O)2, [(UO2)(CrO4)(H2O)2](H2O) and [(UO2)(CrO4)(H2O)2]4(H2O)9
- Structure characterization of molecular complexes for non-linear optical materials I. X-ray analysis and AM1 calculations of 1 : 1 complexes of 8-hydroxiquinoline (1) and isonicotinamide (2) with 2,4,6-trinitrophenol
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