Structural and Electronic Properties of the Ru Pyrochlores Bi2-yYbyRu2O7-δ
| Autor: | Leqing Li, Brendan J. Kennedy |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
General Chemical Engineering
Semiconductor materials Inorganic chemistry Neutron diffraction chemistry.chemical_element General Chemistry Crystal structure Oxygen Metal Crystallography chemistry Electrical resistivity and conductivity visual_art Materials Chemistry visual_art.visual_art_medium Electronic band structure Electronic properties |
| Zdroj: | Chemistry of Materials. 15:4060-4067 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm034503q |
| Popis: | The structures of 13 members in the series Bi 2-y Yb y Ru 2 O 7-δ have been refined using high-resolution powder neutron diffraction data. The resulting structural parameters have been used to calculate the bandwidths for the oxides, and these show a smooth reduction in the t 2g bandwidth as the Yb content is increased. Resistivity measurements show a transition from metallic to semiconducting behavior occurs near y ≃0.9. This corresponds to the point at which the oxygen vacancies are no longer present in the oxides. Evidence for disorder of the Bi cations is presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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