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Related Experiment Videos

Pressure-induced phase transformations in LiAlH4.

Raja S Chellappa1, Dhanesh Chandra, Stephen A Gramsch

  • 1Metallurgical and Materials Engineering Division (MS 388), University of Nevada, Reno, Nevada 89557, USA.

The Journal of Physical Chemistry. B
|June 15, 2006
PubMed
Summary

High pressure transforms lithium aluminum hydride (LiAlH4) into a new phase, altering its Al-H bonds. This high-pressure phase is recoverable at lower pressures, indicating potential for new material properties.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Spectroscopy

Background:

  • Lithium aluminum hydride (LiAlH4) is a key material in hydrogen storage.
  • Understanding its structural behavior under pressure is crucial for material applications.

Purpose of the Study:

  • To investigate pressure-induced phase transformations in LiAlH4.
  • To characterize the structural and bonding changes using in situ Raman spectroscopy.

Main Methods:

  • In situ Raman spectroscopy was employed to study LiAlH4 up to 7 GPa.
  • Analysis of spectral shifts and modes identified phase transitions and bonding alterations.

Main Results:

  • A phase transition was observed at approximately 3 GPa from alpha-LiAlH4 to beta-LiAlH4.

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  • The Al-H stretching mode softened significantly above 3 GPa, indicating bond weakening.
  • The high-pressure beta-LiAlH4 phase was recoverable at approximately 1.2 GPa.

    • Conclusions:

    • LiAlH4 undergoes a reversible pressure-induced phase transformation.
    • The Al-H bond weakens under high pressure and in the recovered phase.
    • These findings offer insights into the pressure-dependent properties of LiAlH4.