Anionic speciation in sodium and potassium silicate glasses near the metasilicate ([Na,K]2SiO3) composition: 29Si, 17O, and 23Na MAS NMR
Anionic speciation in sodium and potassium silicate glasses near the metasilicate ([Na,K]2SiO3) composition: 29Si, 17O, and 23Na MAS NMR
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钠和钾硅酸盐玻璃中偏硅酸盐 ([Na,K]2SiO3) 成分附近的阴离子形态:29Si、17O 和 23Na MAS NMR
DOI:
10.1016/j.nocx.2020.100049
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发表时间:
2020
影响因子:
--
通讯作者:
Stebbins, Jonathan F.
中科院分区:
文献类型:
--
作者:
Stebbins, Jonathan F.
Alkali silicate glasses near to the metasilicate composition provide sensitive tests of anionic speciation. However, reports on29Si NMR data vary considerably in their derived proportions of silicate species. In some cases, an apparent deficit in the content of non-bridging oxygen has been attributed to up to 5 to 10% “free” oxide ions. Here we provide new NMR data on a series of sodium silicate glasses ranging from 56 to 45 mol% silica with accurately analyzed compositions. High signal-to-noise data for a29Si-enriched glass provide improved constraints on fitting models for spectra, and suggests a slight asymmetry in the main Q2component. Data are consistent with conventional models in which “free” oxide contents are below detection limits of about 0.5 to 1%. Spectra for an17O-enriched K-silicate glass with about 53% silica confirm that there is no obvious direct signature for “free” oxide species in this compositional range.
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DOI:
--
发表时间:
1991
期刊:
影响因子:
--
作者:
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DOI:
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1989
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通讯作者:
TAULELLE, F