Detection of “free” oxide ions in low-silica Ca/Mg silicate glasses: Results from 17O → 29Si HETCOR NMR
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- 作者：Ivan Hunga ; Zhehong Gana ; Peter L. Gor'kova ; Derrick C. Kasemanb ; Sabyasachi Senb ; Michelle LaCombc ; Jonathan F. Stebbinsc ; stebbins@stanford.edu" class="auth_mail" title="E-mail the corresponding author
- 关键词：Nuclear magnetic resonance ; NMR ; Heteronuclear correlation ; HETCOR ; Silicate glass ; Free oxide ion
- 刊名：Journal of Non-Crystalline Solids
- 出版年：2016
- 出版时间：1 August 2016
- 年：2016
- 卷：445-446
- 期：Complete
- 页码：1-6
- 全文大小：647 K
文摘
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17O to 29Si HETCOR NMR can select oxygen sites with and w/o Si neighbors in silicates.
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We tested this selectivity on crystalline Ca3SiO5, which contains ‘free’ oxide ions.
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In Ca/Mg silicate glasses with 29–33% SiO2, HETCOR NMR reveals such ‘free’ oxide ions.
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These ‘free’ oxide ions are largely coordinated by Mg2 +, not a Ca/Mg mixture.