Order and disorder in sodium silicate glasses and melts at 10 GPa

Details Order and disorder in sodium silicate glasses and melts at 10 GPa Order and disorder in sodium silicate glasses and melts at 10 GPa

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30psde6l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 16, pp. SDE 6-1, CiteID 1845, DOI 10.1029/2003GL017735

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9

Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: High-Pressure Behavior, Mineral Physics: Nmr, Mossbauer Spectroscopy, And Other Magnetic Techniques, Mineral Physics: Physical Thermodynamics, Volcanology: Magma Migration

Scientific paper

We report experimental evidence, in conjunction with quantum chemical calculation, supporting chemical ordering among network polyhedra (e.g. [5]Si and [6]Si) in sodium silicate glasses quenched from melts at 10 GPa by using 17O 3QMAS (triple quantum magic angle spinning) NMR, which resolves new oxygen sites at high pressure, including [5,6]Si-O-[4]Si and Na-O-[5,6]Si. The distribution of network polyhedra at 10 GPa, a controlling factor for transport and melting processes in the mantle, is not completely random but favors formation of oxygen linking dissimilar Si pairs such as [5,6]Si-O-[4]Si. The presence of non-bridging oxygens (NBOs) in highly coordinated units at 10 GPa, Na-O-[5,6]Si, indicates that the formation of highly coordinated Si can also occur at initially depolymerized silicon tetrahedra such as Q3 or Q2. The methods and results given here yield improved prospects for understanding melt structures at high pressure and the atomistic origin of magmatic processes in the Earth's interior.

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