Abstract
The co-effects of two glass-formers in the TeO2-P2O5 system are studied on the basis of neutron diffraction data. The curves for the radial distribution function (RDF) obtained show a high extent of destruction of the short-range order in the tellurite matrix, while the basic co-ordination PO4 polyhedron remains unchanged. The co-ordination number (cn) of the Te atom changes from 4 to 3+1 and marked tendency towards elongation of the Te-O distances over 2.3 Å is observed. The considerably higher stability of the PO4 polyhedra and their strong influence on the TeO4 polyhedra is established. The observed “smearing” effect of the Te-Te, Te-second O and O-second O distances in the range of 3.8 to 3.9 Å in other tellurite glasses is also characteristic of this system. A structural interpretation of the liquid-liquid immiscibility on the short-range order level in the system is given. A critical composition with 26±5% of the second glass-former is established, above which concentration a stable immiscibility in the tellurite systems is observed. An attempt is made to construct two adequate structural models (microhomogeneous and microheterogeneous) for the short-range order in the glasses studied.
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Neov, S., Gerasimova, I., Kozhukharov, V. et al. The structure of glasses in the TeO2-P2O5 system. J Mater Sci 15, 1153–1166 (1980). https://doi.org/10.1007/BF00551804
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DOI: https://doi.org/10.1007/BF00551804