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- W4323349393 abstract "The oxygen speciation in (Na2O)x(GeO2)100-x glasses with 4 ≤ x ≤ 28 is studied using high-resolution 17O NMR spectroscopy at ultra-high field (35.2 T). The structure of glasses with x ≤ 18 consists of oxygen atoms bridging either two four-coordinated GeIV atoms (O44) or a GeIV and another six-coordinated GeVI atom (O46). The O46: O44 ratio monotonically increases with increasing Na2O content in this composition range. Further addition of Na2O results in a lowering of O46 and in a concomitant rise in the concentration of non-bridging oxygen (NBO) atoms. The resulting compositional variation in the average coordination number of Ge atoms is associated with the non-monotonic evolution of density and the germanate anomaly in these glasses. On the other hand, increasing fictive temperature results in a net conversion of GeVI → GeIV + NBO in these glasses, which is argued to be a source of temperature dependent configurational entropy in germanate liquids." @default.
- W4323349393 created "2023-03-08" @default.
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- W4323349393 date "2023-06-01" @default.
- W4323349393 modified "2023-09-27" @default.
- W4323349393 title "Germanate anomaly and its temperature dependence: An ultra-high field 17O NMR spectroscopic study of sodium germanate glasses" @default.
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- W4323349393 doi "https://doi.org/10.1016/j.nocx.2023.100175" @default.
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