Correlations between 17O NMR parameters and local structure around oxygen in high-pressure silicates: implications for the structure of silicate melts at high pressure

Xue Xianyu Xue, J. F. Stebbins, M. Kanzaki

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

In order to understand the correlations between 17O NMR parameters and the local structure around O in high-pressure silicates, 17O MAS and static NMR spectra on several crystalline alkali silicate and silica phases, as well as on ambient pressure glasses have been obtained. The results show that 17O NMR is capable of distinguishing nonbridging O atoms (NBO), bridging atoms (BO: [4]Si-O-[4]Si), O atoms in the [4]Si-O-[6]Si linkage, and O atoms coordinated to three [6]Si ([3]O). NBO are characterized by small quadrupolar coupling constants (e2qQ/h, ~2.3 MHz), but their isotropic chemical shifts (δi) are very sensitive to the type of network-modifying cations. 17O NMR has also been applied to study the structure of alkali silicate glasses quenched from melts at high pressure. -from Authors

Original languageEnglish
Pages (from-to)31-42
Number of pages12
JournalAmerican Mineralogist
Volume79
Issue number1-2
Publication statusPublished - Jan 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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