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NMR to determine rates of motion and structures in metal-hydrides

Conradi, Mark S. and Mendenhall, Michael P. and Ivancic, Timothy M. and Carl, Erik A. and Browning, Caleb D. and Notten, P. H. L. and Kalisvaart, W. P. and Magusin, Pieter C. M. M. and Bowman, R. C., Jr. and Hwang, Son-Jong and Adolphi, Natalie L. (2007) NMR to determine rates of motion and structures in metal-hydrides. Journal of Alloys and Compounds, 446-44 . pp. 499-503. ISSN 0925-8388. doi:10.1016/j.jallcom.2006.11.149.

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Measurements of nuclear magnetic resonance (NMR) relaxation times allow the rates of H and D atomic hopping in metal-hydrides to be determined. A first example compares the rates of H hopping in Mg_(65)Sc_(35)Pd_(2.4)H_(220), a promising new battery electrode and storage alloy, to LaNi_5H_x and to the end-members of the alloy system, ScH_2 and MgH_2. The motion of MgScH is more rapid than in the metallic ScH_2 and the ionic MgH_2, but slower than in LaNi_5H_x. Magic-angle spinning (MAS) NMR of metal-deuterides is a newer method that can resolve inequivalent D atoms and measure the rate of diffusive exchange between the sites. Examples include the tetrahedral and octahedral sites in YD_(2+x) and D in ZrNiD_x.

Item Type:Article
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Bowman, R. C., Jr.0000-0002-2114-1713
Hwang, Son-Jong0000-0002-3210-466X
Additional Information:© 2006 Elsevier B.V. Received 26 September 2006; accepted 16 November 2006. Available online 2 January 2007. The authors acknowledge support from NSF grant DMR-0400512 and DOE grants DE-FG02-05ER46256 and DEAI- 01-05EE11105. The ZrNiDx work was performed under NSF grant DMR-9804094 and Research Corp. grant CC4705. The research was partially performed at Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautical and Space Administration. The effort of the Caltech NMR facility was supported under NSF grants 97243240 and DMR-0080065(MRSEC program).We thank T.J. Udovic and the authors of Ref. [26] for use of their data. The research on MgSc hydrides was performed as part of the Sustainable Hydrogen Program of Active Chemical Technologies for Sustainability (ACTS).
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-05ER46256
Department of Energy (DOE)DEAI-01-05EE11105
Research Corp.CC4705
Subject Keywords:Metal hydrides; Diffusion; Nuclear resonances
Record Number:CaltechAUTHORS:20100503-142517559
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18114
Deposited By: Tony Diaz
Deposited On:05 May 2010 02:54
Last Modified:08 Nov 2021 23:41

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