LOCAL-STRUCTURE AND CHEMICAL-SHIFTS FOR 6-COORDINATED SILICON IN HIGH-PRESSURE MANTLE PHASES

被引：62

作者：

STEBBINS, JF ^{[1
]}

KANZAKI, M ^{[1
]}

机构：

[1] UNIV ALBERTA, EXPTL PETROL LAB, EDMONTON T6G 2E3, ALBERTA, CANADA

来源：

SCIENCE | 1991年 / 251卷 / 4991期

关键词：

D O I：

10.1126/science.251.4991.294

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Most of the earth's mantle is made up of high-pressure silicate minerals that contain octahedrally coordinated silicon (Si(VI), 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 Si(VI) 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.

引用

页码：294 / 298

页数：5

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