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A Al-27 MAS NMR study of a sol-gel produced alumina: Identification of the NMR parameters of the theta-Al2O3 transition alumina phase

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<mark>Journal publication date</mark>1/07/2007
<mark>Journal</mark>Solid State Nuclear Magnetic Resonance
Issue number4
Volume31
Number of pages5
Pages (from-to)169-173
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Al-27 MAS NMR has been used to study a sol-gel prepared alumina annealed at various temperatures. Two-field simulation of the sample heated to 1200 degrees C confirmed the presence of corundum, as suggested by XRD, and also the presence of nanocrystalline theta-Al2O3. Al-27 MAS NMR chemical shifts, quadrupolar coupling constants and asymmetry parameters are reported for the tetrahedral and octahedral aluminium sites within theta-Al2O3.