Bonding and Structural Variations in Doped Bi2Sn2O7

✍ Scribed by Ismunandar; Brendan J. Kennedy; Brett A. Hunter; Tom Vogt

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 295 KB
• Volume: 131
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7387

✦ Synopsis

The structural properties of Y-doped Bi 2 Sn 2 O 7 have 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)Sn 2 O 7 and (BiYb) Sn 2 O 7 have been undertaken. The structure of the high temperature, pyrochlore phase of Bi 2 Sn 2 O 7 has 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.