Adhikari, Uday Bhanu and Parya, T K (2010) Thermal behaviour of co-precipitated magnesium-aluminium hydroxides gel. Journal of the Indian Chemical Society, 87 (3). pp. 331-338. ISSN 0019-4522

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Abstract

Thermal behaviour of co-precipitated Mg-Al hydroxides gel towards the formation of composite powders of periclase and MgAl(2)O(4) spinel at low temperature was investigated. The co-precipitated Mg-Al hydroxy compounds were synthesized at two different temperatures and at pH ranges in between 8.56 and 9.20 from chloride salts of respective ions with molar ratio for MgO : Al(2)O(3) as 2 : 1 using various combinations of ammonium hydroxides, triethanol amine (TEA) and ammonium carbonate mixture as basic media for co-precipitation The co-precipitated hydroxide gel dried at 110 degrees C and heated at different temperatures up to 1000 degrees C were characterised by DTA. TGA and XRD studies. In all cases the co-precipitated Mg-Al hydroxy phases collapsed at 400 degrees C with the conversion to transient amorphous phases. Further heat treatment at higher temperatures led to the formation of MgAl(2)O(4) spinel and minor periclase phases at temperature as low as 600 degrees C. The cm-precipitated Mg-Al hydroxides gel derived from TEA-NH(4)OH basic media exhibited promising results so far as transformation to composite powders of MgAl(2)O(4) spinel and periclase at relatively low temperature is concerned.

Item Type:	Article
Uncontrolled Keywords:	Co-precipitation; basic media; Mg-Al hydroxide gel; MgAl(2)O(4) spinel
Subjects:	Basic Science
Divisions:	Ceramic Membrane
Depositing User:	Bidhan Chaudhuri
Date Deposited:	01 Feb 2012 11:39
Last Modified:	11 Jun 2015 06:25
URI:	http://cgcri.csircentral.net/id/eprint/583

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