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Preparation of lithium B ''-alumina by the ion-exchange reaction

Jayaraman, V and Periaswami, G and Kutty, TRN (1998) Preparation of lithium B ''-alumina by the ion-exchange reaction. In: Materials Research Bulletin, 33 (12). pp. 1811-1820.

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Abstract

Preparation of Li-beta"-alumina is realized by the heterogeneous ion-exchange reaction between Na-beta"-alumina and LiCl in the solid state or melt at 800 to 930 K. The utility of Na-beta"-alumina as a template wherein Li+ ions replace Na+ from the conduction planes arises from the high reactivity of the precursor prepared by the novel wet chemical gel-to-crystallite conversion (G-C) technique. High-resolution transmission electron microscopy (HRTEM) revealed the presence of splinter fragments resulting from high density of stacking faults in Li-beta"-alumina. The decrease in intensities of (00l) reflections in powder X-ray diffraction (XRD) patterns on annealing between 873 and 1173 K is due to the intra-diffusion of Li+ from the conduction planes into the spinel blocks. gamma-LiAlO2 and LiAl5O8 are formed when Li-beta"-alumina is heated above 1273 K. Lithium aluminospinel, LiAl5O8, is the only residual phase when heated to 1673 K, which is formed as a result of the evaporation of Li2O.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: oxides;chemical synthesis;electron microscopy; thermogravimetric analysis (TGA);ionic conductivity.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 29 Dec 2009 08:53
Last Modified: 19 Sep 2010 05:26
URI: http://eprints.iisc.ernet.in/id/eprint/19087

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