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À propos de : Structural and Electronic Properties of the RuPyrochlores Bi2-yYbyRu2O7-δ        

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  • Structural and Electronic Properties of the RuPyrochlores Bi2-yYbyRu2O7-δ
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  • The origin of the metal−semiconductor transition in ruthenium pyrochlores is explained by a combination of structural studies and band structure calculations. These demonstrate the structural and electronic importance of the Bi 6s lone pair electrons and oxygen vacancies.
  • The structures of 13 members in the series Bi2-yYbyRu2O7-δ have been refined using high-resolution powder neutron diffraction data. The resulting structural parameters have beenused to calculate the bandwidths for the oxides, and these show a smooth reduction in thet2g bandwidth as the Yb content is increased. Resistivity measurements show a transitionfrom metallic to semiconducting behavior occurs near y ≈ 0.9. This corresponds to the pointat which the oxygen vacancies are no longer present in the oxides. Evidence for disorder ofthe Bi cations is presented.
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