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DOI: 10.1039/A701565H (Paper) Reference Section for: J. Mater. Chem., 1997, 7, 1867-1870

Synthesis and crystal structure of zirconium tungstate ZrW2O7(OH,Cl)2·2H2 O

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Mike S. Dadachov and Richard M. Lambrecht

Abstract

ZrW2O7(OH,Cl)2 ·2H2O has been synthesised by refluxing, followed by hydrothermal crystallisation of amorphous zirconium tungstate gels in 1–8 m HCl. It is known that the amorphous Zr tungstate can be used as a gel-generator for production of the 188Re medical radioisotope. The structure of ZrW2O7(OH,Cl)2 ·2H2O has been refined by conventional powder diffractometer data. The compound crystallises in the tetragonal space group I41cd (no. 110) with a=11.4454(4), c=12.4851(7) Å, Z=8 and Dc=3.74 g cm-3 . Rietveld refinement has been carried out from X-ray diffraction data using Co-Kα radiation over the angular range 15–105° (2θ) and converged with Rwp=8.85%, Rp=6.60%. The structure consists of regular ZrO7 pentagonal bipyramids and distorted WO6 octahedra, connected in a three-dimensional framework. The terminal hydroxy groups of tungsten polyhedra are statistically substituted by Cl.

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