UNSPECIFIED (1993) AN EXPERIMENTAL-STUDY OF CROSS-POLARIZATION FROM H-1 TO AL-27 IN CRYSTALLINE AND AMORPHOUS MATERIALS. APPLIED MAGNETIC RESONANCE, 4 (1-2). pp. 89-100. ISSN 0937-9347

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Abstract

The conditions for successful H-1 - Al-27 cross polarization experiments have been investigated. It was found that boehmite was a good material for setting up the Hartmann-Hahn match condition, and both tetrahedral and octahedral aluminium was observed in a variety of environments. The contact time dependence of the CP signal was studied for several samples and simulations showed that T(IS) could be estimated and hence information on mean H-1-Al-27 distances in glasses deduced. CP signals could be obtained even if T1rho(Al) is much less than T(IS), contrary to some previous suggestions. MAS reduces both the size of the CP signal and the optimum contact time and to maintain signal strength spinning should be as slow as possible.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	APPLIED MAGNETIC RESONANCE
Publisher:	SPRINGER VERLAG
ISSN:	0937-9347
Date:	1993
Volume:	4
Number:	1-2
Number of Pages:	12
Page Range:	pp. 89-100
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/21197

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