Pressure-induced phase transformations in LiAlH4

Article Abstract:

The pressure induced phase transformations in pure LiAlH4 were studied using in situ Raman spectroscopy. The analyses of the spectra reveal a phase transition at approximately 3 GPa from the ambient pressure monoclinic [alpha]-LiAlH4 phase to a high pressure phase [beta]-LiAlH4 having a distorted [[AlH4].sup.-] tetrahedron and the Al-H stretching mode in the quenched state further shifts to lower frequencies, suggesting a weakening of the Al-H bond.

Dehydrogenation

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Comment on "effect of chromium substitution on the lattice vibration of spinel lithium manganate: A new interpretation of the Raman spectrum of LiMn2O4"

Article Abstract:

The effects of the chromium substitution in spinel lithium manganate (LiMn(sub2-x)Cr(sub x)O(sub 4) 0 (less than or equal to) x (less than or equal to) 0.5 is examined by means of the X-ray absorption spectroscopy (XAS) and micro-Raman spectroscopy. The results showed that the true Raman spectrum of LiMn2O4 consists of a broad peak at around 580 cm(super -1), with poorly defined features between 300 and 450 cm(super -1).

Italy, Science & research, Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Chromium, Research, X-ray spectroscopy, Chromium (Metal)

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