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Science 18 January 1991:
Vol. 251. no. 4991, pp. 294 - 298
DOI: 10.1126/science.251.4991.294
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Articles

Local Structure and Chemical Shifts for Six-Coordinated Silicon in High-Pressure Mantle Phases

JONATHAN F. STEBBINS 1 and MASAMI KANZAKI 2

1 Department of Geology, Stanford University, Stanford, CA 94305
2 Department of Geology and C. M. Scarfe Laboratory for Experimental Petrology, University of Alberta, Edmonton, Canada AB T6G 2E3

Most of the earth's mantle is made up of high-pressure silicate minerals that contain octahedrally coordinated silicon (SiVI), but many thermodynamically important details of cation site ordering remain unknown. Silicon-29 nuclear magnetic resonance (NMR) spectroscopy is potentially very useful for determining short-range structure. A systematic study of silicon-29 chemical shifts for SiVI has revealed empirical correlations between shift and structure that are useful in understanding several new calcium silicates. The observed ordering state of a number of high-pressure magnesium silicates is consistent with the results of previous x-ray diffraction studies

Submitted on September 4, 1990
Accepted on October 24, 1990


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