A (27)Al MAS NMR study of a sol-gel produced alumina: Identification of the NMR parameters of the theta-Al(2)O(3) transition alumina phase期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

A (27)Al MAS NMR study of a sol-gel produced alumina: Identification of the NMR parameters of the theta-Al(2)O(3) transition alumina phase

Authors:	O'Dell L A Savin S L P Chadwick A V Smith M E

Affiliation:	^aDepartment of Physics, University of Warwick, Coventry, CV4 7AL, UK ^bSchool of Physical Sciences, University of Kent, Canterbury, Kent, CT2 7NH, UK

Abstract:	²⁷Al 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 °C confirmed the presence of corundum, as suggested by XRD, and also the presence of nanocrystalline θ-Al₂O₃. ²⁷Al MAS NMR chemical shifts, quadrupolar coupling constants and asymmetry parameters are reported for the tetrahedral and octahedral aluminium sites within θ-Al₂O₃.

Keywords:	²⁷Al MAS NMR θ-alumina NMR interaction parameters
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