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.
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Li et al. (2003) studied this question.
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