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Thermal behaviour of hydroxides, hydroxysalts and hydrotalcites

Bera, Parthasarathi and Rajamathi, Michael and Hegde, MS and Kamath, Vishnu P (2000) Thermal behaviour of hydroxides, hydroxysalts and hydrotalcites. In: Bulletin of Materials Science, 23 (2). pp. 141-145.

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Abstract

Mass spectrometric analysis of gases evolved during thermal decomposition of divalent metal hydroxides, hydroxysalts and hydrotalcites show that all these compounds undergo dehydration in the temperature range 30 < T < 220°C followed by decomposition at temperatures above 250°C. The latter step involves simultaneous deanation and dehydroxylation of the layers. Our observations conclusively prove that alternative mechanisms which envisage CO2 evolution due to deanation at lower temperatures proposed by Kanezaki to be wrong.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Indian Academy Sciences.
Keywords: Hydroxides;hydrotalcites;temperature programmed decomposition (TPD).
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 12 Oct 2004
Last Modified: 19 Sep 2010 04:15
URI: http://eprints.iisc.ernet.in/id/eprint/1728

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