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Pressure-Induced Phase Transformations in Li-based Complex Hydrides

Published online by Cambridge University Press:  26 February 2011

Raja Chellappa ,
Dhanesh Chandra ,
Stephen Gramsch ,
Maddury Somayazulu  and
Russell Hemley
Raja Chellappa
Affiliation:
raja@unr.edu, University of Nevada, Reno, Chemical & Metallurgical Engineering, 1664 N. Virginia Street (MS 388), Reno, NV, 89557, United States, 7757841446, 7753275059
Dhanesh Chandra
Affiliation:
dchandra@unr.edu, University of Nevada, Reno, Chemical & Metallurgical Engineering, 1664 N. Virginia Street (MS 388), Reno, NV, 89557, United States
Stephen Gramsch
Affiliation:
s.gramsch@gl.ciw.edu, Carnegie Institution of Washington, Geophysical Laboratory, 5251 Broad Branch, NW, Washington, DC, 20015, United States
Maddury Somayazulu
Affiliation:
zulu@gl.ciw.edu, Carnegie Institution of Washington, Geophysical Laboratory, 5251 Broad Branch, NW, Washington, DC, 20015, United States
Russell Hemley
Affiliation:
r.hemley@gl.ciw.edu, Carnegie Institution of Washington, Geophysical Laboratory, 5251 Broad Branch, NW, Washington, DC, 20015, United States
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Abstract

An overview of the pressure-induced transformations and order-disorder phenomena in LiAlH4 (up to 7 GPa) and LiNH2 (up to 25 GPa) are presented. The analysis of pressure-induced changes in Raman spectra suggest a phase transition at ∼3 GPa for LiAlH4 and ∼14 GPa for LiNH2. New results on the metastable recovery of the high pressure β-LiAlH4 phase are also presented. An examination of the lattice translational and librational modes reveals that the high pressure β-LiAlH4 phase is disordered while there is evidence of orientational ordering in the high pressure beta-LiNH2 phase.

Keywords

phase transformationRaman spectroscopydensification
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 987: Symposium PP – Materials Research at High Pressure , 2006 , 0987-PP04-10
Copyright
Copyright © Materials Research Society 2007

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References

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