Structure Refinements with a New Version of the Rietveld-Refinement Program RIETAN
نویسندگان
چکیده
منابع مشابه
Crystal structure of Na2HfSi2O7 by Rietveld refinement
The structure of triclinic disodium hafnium disilicate, Na2HfSi2O7, has been determined by laboratory powder X-ray diffraction and refined by the Rietveld refinement. The structure is a framework made of alternate layers of HfO6 octa-hedra and SiO4 tetra-hedra linked by common O atoms. Sodium atoms are located in the voids of the framework, aligned into tunnels along the [010] direction. Na2HfS...
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Y(2)GeO(5) (yttrium germanium penta-oxide) was synthesized by solid-state reaction at 1443 K. The arrangement, which has monoclinic symmetry, is isostructural with Dy(2)GeO(5) and presents two independent sites for the Y atoms. Around these atoms there are distorted six-coordinated YO(6) octa-hedra and seven-coordinated YO(7) penta-gonal bipyramids. The YO(7) polyhedra are linked together, shar...
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Abstraet.The crystal structure of the new zeolite mineral gobbinsite, Cao.6Na2.6K2.2Al6Si¡o032 . 12H20, has been determined in the space groupPmn2¡ with a = 10.108(1), b = 9.766(1) and e = 10.171(1) Á. The topology of the framework is the same as that of gismondine and can be describedas a stacking of2-dimensional arrays of double crankshaft chains. The structure was refined by the Rietveld tec...
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Global optimisation methods of structure determination from powder diffraction data have risen to prominence in a relatively short space of time and they now constitute a key approach in the examination of polycrystalline molecular organic materials. A correctly formulated global optimisation approach may be regarded as a "global Rietveld refinement" that is capable of delivering accurate cryst...
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ژورنال
عنوان ژورنال: Journal of the Ceramic Society of Japan
سال: 1994
ISSN: 0914-5400,1882-1022
DOI: 10.2109/jcersj.102.401