Silicon coordination and speciation changes in a silicate liquid at high pressures

Xianyu Xue, Jonathan F. Stebbins, Masami Kanzaki, Reidar G. Trønnes

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Abstract

Coordination and local geometry around Si cations in silicate liquids are of primary importance in controlling the chemical and physical properties of magmas. Pressure-induced changes from fourfold to sixfold coordination of Si in silicate glass samples quenched from liquids has been detected with 29Si magic-angle spinning nuclear magnetic resonance spectrometry. Samples of Na2Si2O5 glass quenched from 8 gigapascals and 1500°C contained about 1.5 percent octahedral Si, which was demonstrably part of a homogeneous, amorphous phase. The dominant tetrahedral Si speciation in these glasses became disproportionated to a more random distribution of bridging and nonbridging oxygens with increasing pressure.

Original languageEnglish
Pages (from-to)962-964
Number of pages3
JournalScience
Volume245
Issue number4921
Publication statusPublished - 1989
Externally publishedYes

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