Hostname: page-component-cd9895bd7-gbm5v Total loading time: 0 Render date: 2024-12-27T01:58:50.850Z Has data issue: false hasContentIssue false
  • English
  • Français

NMR and X-ray Diffraction Studies of Phases in the Destabilized LiH-Si System

Published online by Cambridge University Press:  01 February 2011

R. C. Bowman Jr ,
S.-J. Hwang ,
C. C. Ahn  and
J. J. Vajo
R. C. Bowman Jr
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, U.S.A.
S.-J. Hwang
Affiliation:
Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, U.S.A.
C. C. Ahn
Affiliation:
Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA 91125, U.S.A.
J. J. Vajo
Affiliation:
HRL Laboratories, LLC, Malibu, CA 90265, U.S.A.
Get access

Abstract

Hydrogen absorption and desorption isotherms have been measured on ballmilled mixtures of LiH+Si powders to evaluate the thermodynamic parameters of these reversible reactions. The phase compositions at the various stages of reaction have been examined by Magic Angle Spinning-Nuclear Magnetic Resonance (MAS-NMR) of the 7Li, 1H, and 29Si nuclei and powder x-ray diffraction (XRD). The initial mixtures of LiH and Si were found to convert into known Li-Si silicide intermetallics (i.e., Li12Si7, Li7Si3, and Li13Si4) as well as providing evidence for a previously unknown ternary Li-Si-H phase as hydrogen was first desorbed and then absorbed. While the absorption reactions are reversible over portions of the Li-Si-H composition range, incomplete recovery of the original LiH + Si phases was also observed under some test conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 837: Symposium N – Materials for Hydrogen Storage – 2004 , 2004 , N3.6
Copyright
Copyright © Materials Research Society 2005

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Vajo, J. J., Mertens, F., Ahn, C. C., Bowman, R. C. Jr, and Fultz, B., J. Phys. Chem. B108, 13977 (2004).Google Scholar
2. van der Marel, C., Vinke, G. J. B., and van der Lugt, W., Solid State Comm. 54, 917 (1985).Google Scholar
3. Braga, M. H., Malheiros, L. F., and Ansara, I., J. Phase Equil. 16, 324 (1995).Google Scholar
4. Stearns, L. A., Gryko, J., Diefenbacher, J., Ramachandran, G. K., and McMillan, P. F., J. Sol. St. Chem. 173, 251 (2003).Google Scholar
5. Shao, W.-L., Shinar, J., Gerstein, B. C., Li, F., Lannin, J. S., Phys. Rev. B 41, 9491 (1990).Google Scholar
6. Veleckis, E., J. Nucl. Mater. 79, 20 (1979).Google Scholar
7. Brandt, M. S., Ready, S. E., and Boyce, J. B., Appl. Phys. Lett. 70, 188 (1997).Google Scholar