Ab-initio molecular orbital calculations have been performed on the cluster modeling the medium-range structure of TeO
2 glass at the Hartree-Fock level. The calculations have reasonably reproduced a neutron radial distribution function and Raman spectrum observed for TeO
2 glass. The calculated results have also demonstrated that the short- and medium-range structures of TeO
2 glass cannot be interpreted in terms of the structural unit of either α-TeO
2 or β-TeO
2 crystal, suggesting that TeO
2 glass has an inherent structure that can not be found in the corresponding crystals.
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