Abstract
The structural properties of Y-doped Bi2Sn2O7have been determined by Rietveld analysis of powder neutron and synchrotron X-ray diffraction data. These materials form a series of cubic pyrochlore-type oxides with a distinct miscibility gap at low Bi contents and show large deviations from Vegards law. Temperature-dependent structural studies of (BiY)Sn2O7and (BiYb) Sn2O7have been undertaken. The structure of the high temperature, pyrochlore phase of Bi2Sn2O7has been refined using powder neutron diffraction data. The evolution of the charge density on the Bi site has been probed using a combination of bond valence sum calculations and electronic spectroscopy.
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