The electronic structure and bonding in the Y₂{O}₃$ crystal is completely elucidated by first-principles self-consistent band-structure and optical calculations. Results agree well with experiments. The unique type of bonding in ${Y}₂O₃ is emphasized; it does not support the fully ionic picture and is best descibed as Y₂+2.16{O}₃^{{{-}}1.44}$.
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Ching et al. (1990) studied this question.
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