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.
(27)Al 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-Al(2)O(3). (27)Al MAS NMR chemical shifts, quadrupolar coupling constants and asymmetry parameters are reported for the tetrahedral and octahedral aluminium sites within theta-Al(2)O(3).
O'Dell
L A
LA
Department of Physics, University of Warwick, Coventry, UK.
Savin
S L P
SL
Chadwick
A V
AV
Smith
M E
ME
D000535:Aluminum; D000537:Aluminum Oxide; D009682:Magnetic Resonance Spectroscopy; D009686:Nuclear Physics
D000535:Aluminum; D000537:Aluminum Oxide