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Raman Spectroscopy Measurements of the Pressure−Temperature Behavior of LiAlH4

Fallas, Juan C.
Chien, Wen-Ming
Kamisetty, Vamsi K.
Emmons, Erik D.
Covington, Aaron M.
Chellappa, Raja
Gramsch, Stephen A.
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Published in Journal of Physical Chemistry. C. 2010, vol. 114, no. 27, p. 11991-11997
Abstract The pressure/temperature phase diagram of LiAlH4 has been constructed by using Raman spectroscopy data. In situ high pressure−temperature experiments were carried out using resistively heated diamond anvil cells up to 150 °C and 7 GPa. Room temperature phase transitions of monoclinic α-LiAlH4 → δ-LiAlH4 were observed at ~3.2 GPa. As the temperature is increased to ~100 °C, both the α and δ phases transform to β-LiAlH4 and remain stable up to 5.5 GPa. At temperatures greater than 300 °C, a new γ-LiAlH4 phase forms. Data of Konovalov (1995) has been used to define the phase boundary between β- and γ-LiAlH4 phases. We present a pressure−temperature phase diagram of LiAlH4 based using diamond anvil cells coupled with Raman spectroscopy.
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FALLAS, Juan C. et al. Raman Spectroscopy Measurements of the Pressure−Temperature Behavior of LiAlH4. In: Journal of Physical Chemistry. C, 2010, vol. 114, n° 27, p. 11991-11997. https://archive-ouverte.unige.ch/unige:14747

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Deposited on : 2011-03-18

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