Oxygen Speciation in Nanophase MgO from Solid-State 17O NMR

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• 作者：Alan V. Chadwick ; Iain J. F. Poplett ; David T. S. Maitland ; and Mark E. Smith
• 刊名：Chemistry of Materials
• 出版年：1998
• 出版时间：March 1998
• 年：1998
• 卷：10
• 期：3
• 页码：864 - 870
• 全文大小：118K
• 年卷期：v.10,no.3(March 1998)
• ISSN：1520-5002

文摘

Nanocrystalline MgO has been sol-gel manufactured to give arange of crystallite sizesfrom 1.8 to 35 nm as determined by powder X-ray diffraction. Amultinuclear magneticresonance approach using ¹³C, ¹⁷O, and²⁵Mg provides information on the atomicscalestructure. It is found that despite extensive hydrolysis that-CH₃ fragments persist untilextensive calcination has been performed. In ¹⁷O magicangle spinning NMR spectra threesignals are detected that are assigned to MgO-like, a surface species,and a unit also likeMgO but with carbon as the third nearest neighbor, demonstrating thehigh sensitivity ofthe ¹⁷O chemical shift to local structure and its abilityto detect medium-range order.