Network structure of M 2O–TeO 2 (M=Li, Na, Li 0.62Na 0.38) glasses

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The network structures of xM 2O–(100− x)TeO 2 (M=Li, Na, Li 0.62Na 0.38) ( x=10, 25, 33 mol%) glasses prepared by melt quenching were studied by X-ray and neutron diffraction. The partial correlation functions for network frameworks have been calculated using the Reverse Monte Carlo (RMC) method. As a result, it was found that Te–Te correlation does not change with increasing alkali content. The RMC result supports recent reported observation that the units of TeO 4 trigonal bipyramid decrease by addition of alkali oxide, while the units of TeO 3 trigonal pyramid increase.