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Conversion of gamma lithium aluminate to lithium aluminum carbonate hydroxide hydrate

Published online by Cambridge University Press:  10 January 2013

Susan Jacob Beckerman ,
Robert B. Ford  and
Mark T. Nemeth
Susan Jacob Beckerman
Affiliation:
Cyprus Foote Mineral Company, Kings Mountain, North Carolina 28086
Robert B. Ford
Affiliation:
Cyprus Foote Mineral Company, Kings Mountain, North Carolina 28086
Mark T. Nemeth
Affiliation:
Cyprus Foote Mineral Company, Kings Mountain, North Carolina 28086
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Abstract

Gamma-phase lithium aluminate (LiAlO2) is a ceramic powder used in molten carbonate fuel cells (MCFCs) and in other nuclear and ceramic applications. Upon exposure to water vapor and carbon dioxide at 25 °C, we have observed that gamma-LiAlO2 converts to lithium aluminum carbonate hydroxide hydrate, Li2Al4(CO3)(OH)12·3H2O(LACHH) and Li2CO3. The conversion was observed by X-ray diffraction (XRD) and carbonate analysis. An equation for the conversion is given, and the morphology is determined by scanning electron microscopy. A high-temperature XRD study and thermogravimetric/differential thermal analysis (TGA/DTA) showed that LACHH decomposes at 250 °C. The decomposition products of LACHH and Li2CO3 react to form first alpha-LiAlO2 and then gamma-LiAlO2 at temperatures of 650 and 1000 °C, respectively.

Type
Research Article
Information
Powder Diffraction , Volume 11 , Issue 4 , December 1996 , pp. 312 - 317
Copyright
Copyright © Cambridge University Press 1996

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