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- W2030790771 abstract "Abstract (NaPO 3 ) (1- x ) -(TiO 2 ) x glasses ( x ≤0.4) were prepared by melting at 1400°C mixtures of NaPO 3 and TiO 2 . The melt was poured out in a graphite mold and annealed. DSC measurements give the variation of T g from 290°C (NaPO 3 ) to 620°C ( x =0.4). FTIR spectroscopy shows the evolution of the phosphate skeleton: (PO 3 ) ∞ chains for NaPO 3 to PO 4 groups in the richest TiO 2 glass. Ionic conductivity is obtained by impedance plots (10 −2 -10 5 Hz) on cylindrical cells. It decreases from 10 −4 to 7×10 −6 ω −1 cm −1 at 200°C; the activation energy increases from 13.5 to 14 Kcal/mole. Neutron scattering (λ=0.9 A; Q:0.3 to 14 A −1 ) leads to pair distribution RDF with peaks at 1.5 (P-O) and 2.4 A (O-O and Na-O). ΔRDF enables discrimination between pairs either including Ti or not. The first negative peak at 1.95 A is assigned to the hexacoordination (Ti-O) of titanium. TiO 2 addition does not increase the conductivity, because the Na + molar fraction decreases and its environment is unmodified." @default.
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- W2030790771 date "1992-11-01" @default.
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- W2030790771 title "Correlations between structure and conductivity in NaPO3-TiO2 glasses" @default.
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- W2030790771 doi "https://doi.org/10.1016/0167-2738(92)90012-e" @default.
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