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Solid State NMR Studies of the Aluminum Hydride Phases

Published online by Cambridge University Press:  01 February 2011

Son-Jong Hwang ,
Robert C. Bowman ,
Jason Graetz  and
J. J. Reilly
Son-Jong Hwang
Affiliation:
sonjong@cheme.caltech.edu, California Institute of Technology, The Div of Chem and Chem Eng., 1200 E. California Blvd., Pasadena, CA, 91125, United States, 626-395-2323, 626-568-8743
Robert C. Bowman
Affiliation:
rbowman@jpl.nasa.gov, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, United States
Jason Graetz
Affiliation:
graetz@bnl.gov, Brookhaven National Laboratory, Department of Energy Science and Technology, Upton, NY, 11973, United States
J. J. Reilly
Affiliation:
jreillys@bnl.gov, Brookhaven National Laboratory, Department of Energy Science and Technology, Upton, NY, 11973, United States
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Abstract

Several solid state NMR techniques including magic-angle-spinning (MAS) and multiple-quantum (MQ) MAS experiments have been used to characterize various AlH3 samples. MAS-NMR spectra for the 1H and 27Al nuclei have been obtained on a variety of AlH3 samples that include the β- and γ- phases as well as the most stable α-phase. While the dominant components in these NMR spectra correspond to the aluminum hydride phases, other species were found that include Al metal, molecular hydrogen (H2), as well as peaks that can be assigned to Al-O species in different configurations. The occurrence and concentration of these extraneous components are dependent upon the initial AlH3 phase composition and preparation procedures. Both the β-AlH3 and γ-AlH3 phases were found to generate substantial amounts of Al metal when the materials were stored at room temperature while the α-phase materials do not exhibit these changes.

Keywords

nuclear magnetic resonance (NMR)HAl
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 927: Symposium EE – Hydrogen Storage Materials , 2006 , 0927-EE03-03
Copyright
Copyright © Materials Research Society 2006

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