Crystal structure of the stoichiometric compound Cs2W3O10 with a fractional number of atoms in the unit cell
Tóm tắt
The crystal structure of Cs2W3O10 (a=16.103, c=10.169 Å,
$$I\bar 4$$
, Z=120/11) was determined from three-dimensional X-ray diffraction data (CAD-4 automatic diffractometer, 1612 reflections, R=0.044). The structure has an AB2O6 defective pyrochlore motif in which some of the groups consisting of four WO6 octahedra have been subtracted from the tungsten-oxygen framework and substituted by Cs+. The crystal has no vacancies in the substitution site (as confirmed by the occupancy refinement), and the composition of the crystal is strictly stoichiometric with a fractional number of atoms in the unit cell. A similar composition is suggested for the isostructural rubidium compound, which was earlier considered nonstoichiometric.
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