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Volume 134, 2007
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A 27Al, 29Si, 25Mg and 17O NMR investigation of alumina and silica Zener pinned, sol-gel prepared nanocrystalline ZrO2 and MgO

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Abstract

Alumina and silica Zener pinning particles in sol-gel prepared nanocrystalline ZrO2 and MgO have been characterised using 27Al and 29Si MAS NMR after annealing at various temperatures up to 1200 °C. The structures of the pinning phases were found to differ not just between the two metal oxide systems but also depending on the exact method of manufacture. Three distinct transitional alumina phases have been observed in different alumina-pinned samples annealed at 1200 °C, one in particular identified by a peak at a shift of 95 ppm in the 27Al NMR spectrum. Both the alumina and silica pinning phases reacted with the MgO nanocrystals, forming spinel in the case of alumina, and enstatite and forsterite in the case of silica. Despite reacting readily with the MgO, the silica pinning particles were effective at restricting grain growth, with 11 nm MgO nanocrystals remaining after annealing at 1000 °C.

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Publication details

The article was received on 08 Feb 2006, accepted on 04 May 2006 and first published on 21 Jul 2006


Article type: Paper
DOI: 10.1039/B601928E
Faraday Discuss., 2007,134, 83-102

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    A 27Al, 29Si, 25Mg and 17O NMR investigation of alumina and silica Zener pinned, sol-gel prepared nanocrystalline ZrO2 and MgO

    L. A. O’Dell, S. L. P. Savin, A. V. Chadwick and M. E. Smith, Faraday Discuss., 2007, 134, 83
    DOI: 10.1039/B601928E

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