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The electronic structure of ferroelectric Sr 0.5 Ba 0.5 Nb 2 O 6 thin film has been studied by soft-X-ray emission spectroscopy (SXES). In the valence band region, O 2 p and Nb 4 d partial densities of states are observed in the O 1 s and Nb 4 p SXES spectra. The energy position of the Nb 4 d state overlaps with that of the O 2 p state. This finding indicates that the O 2 p state strongly hybridizes with the Nb 4 d state in the valence band.
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Ohtake et al. (2004) studied this question.
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