MO-TeO_2(M=Mg, Zn, Sr, Ba and Pb)ガラスの^<125>Te NMR研究

概要

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The structure of MO-TeO_2(M=Mg, Zn, Sr, Ba and Pb)glasses has been studied by means of ^<125>Te static NMR technique. The fraction of TeO_4 trigonal bipyramid(tbp), N_4 decreased and that of TeO_3 trigonal pyramid(tp), N_3 increased almost linearly up to 33.3 mol% MO and rapidly in the range of 33.3 to 40 mol% MO, with increasing MO content. It was found that the glasses containing Mo in the range of 40 to 45 mol% MO consisted only of TeO_3 tp. On the basis of the structural model proposed in a previous paper, the fractions of TeO_4 tbp without a non-bridging oxygen(NBO) atom, TeO_<4/2>(N_4^0> TeO_4 tbp with an NBO atom, O_<3/2> Te-O^-(N_4^-)and TeO_3 tp with two NBO atoms, O_<1/2>Te=(=O)-O^-(N_3^-)were calculated. The structural change for MO-TeO_2 glasses in the range of 0 to 33.3 mol% MO could be well represented by the model previously proposed for alkali tellurite binary glasses. A new model which represents the structural change for MO-TeO_2 glasses containing more than 33.3 mol% MO has been proposed.
社団法人日本セラミックス協会の論文
1999-05-01