High-resolution 17O NMR spectroscopy of wadsleyite (β-Mg2SiO4)

被引：29

作者：

Ashbrook, SE

Berry, AJ

Hibberson, WO

Steuernagel, S

Wimperis, S ^{[1
]}

机构：

[1] Univ Exeter, Sch Chem, Exeter EX4 4QD, Devon, England

[2] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia

[3] Bruker BioSpin GmbH, D-76287 Rheinstetten, Germany

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2003年 / 125卷 / 39期

关键词：

D O I：

10.1021/ja036777k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The sensitivity of high-resolution 17O (I = 5/2) NMR spectroscopy of solids has advanced significantly in recent years. Here, we show that excellent results are now obtainable from milligram quantities of 17O-enriched materials, thereby allowing the technique to be applied to silicate phases synthesized under very high pressures in a multiple-anvil apparatus. We report the first 17O NMR study of β-Mg2SiO4 (9.6 mg of 35% 17O-enriched material, synthesized at p = 16 GPa and T = 1873 K), a dense phase believed to have a significant role in the Earth's mantle. Using STMAS at magnetic fields of B0 = 9.4 and 11.7 T and MQMAS at B0 = 18.8 T, we have resolved and assigned all four crystallographically distinct O sites and determined their chemical shift and quadrupolar parameters. Copyright © 2003 American Chemical Society.

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页码：11824 / 11825

页数：2

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