Powder Rietveld refinement of armstrongite, CaZr[Si6O15]·3H2O
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D.Yu. Pushcharovsky
Crystal data and results of structure refinement using powder X-ray diffraction and Rietveld analysis for armstrongite, CaZr[Si6O15]·3H2O, are reported. Experimental data were collected using MoKα1 radiation over the range 2° - 51.98° 2θ. Armstrongite is monoclinic (space group C2, Z = 4), with a = 14.018(1) Å, b = 14.133(1) Å, c = 7.840(1) Å, β = 109.40(1)°. The crystal structure, reported by Kashaev and Sapozhnikov (1978) has been refined by Rietveld analysis, resulting in Rwp = 2.75. The structure is based on a heterogeneous octahedra-tetrahedra framework (ZrSi6O15) built by corrugated silicate sheets connected by ZrO6 octahedra. The seven-fold Ca polyhedron contains 2 H2O molecules. Two new sites for H2O molecules on the 2-fold axis in the voids of the zeolite like framework allowed to achieve the complete correspondence between chemical and structural data.
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- Books Received
Articles in the same Issue
- Temperature related structural variation of the hydrous components in gypsum
- Modified hydrothermal diamond anvil cells for XAFS analyses of elements with low energy absorption edges in aqueous solutions at sub- and supercritical conditions
- Edgeworth series expansion of the truncated Cauchy function and its effectiveness in the study of atomic heterogeneity
- Intergrowth polytypoids as modulated structures: the example of the cation deficient oxides LaTi1-xO3
- Crystal structure and thermal expansion of β-RbB5O8 from powder diffraction data
- Potassium lithium carbonate, KLiCO3: single-crystal X-ray structure analysis and thermal expansion
- The crystal structures of NaNO3 at 100 K, 120 K and 563 K
- Powder Rietveld refinement of armstrongite, CaZr[Si6O15]·3H2O
- Molecular structures of two indole alkaloids, evodiamine and rutecarpine, from evodia fruit
- Synthesis and properties of N1-(1,2,3,6-tetrahydrophthaloyl)semi- and thiosemicarbazides. II. Chiral N-substituted amides of 1-(3-ethylthio-1,2,4-triazol-5-yl)-4-cyclohexene-2-carboxylic acid
- Books Received
