Effect of liquid precursor pyrolysis on phase selection in the $MgO-MgAl_2$$O_4$ system

Bhatia, T and Chattopadhyay, K and Jayaram, V (1997) Effect of liquid precursor pyrolysis on phase selection in the $MgO-MgAl_2$$O_4$ system. In: 9th International Conference on Rapidly Quenched and Metastable Materials, AUG 25-30, 1996, BRATISLAVA, SLOVAKIA, pp. 930-937.

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Abstract

Aqueous solutions of Al and Mg nitrates have been spray pyrolysed at 673 K to synthesize powders with compositions varying between MgO and MgAl2O4. This has been carried out with the aim of studying phase selection and phase evolution in this system. The powders have been subsequently heat treated and the sequence of phases characterised by X-ray diffraction and transmission electron microscopy. Metastable extensions of the different phase fields have been calculated based on functions which predict the equilibrium phase diagram accurately. The appearance of phases is closely related to the temperature and to the non-stoichiometry in different compositional ranges of the system. The sequence of phase evolution has been correlated to the thermodynamics of nucleation in the system.

Item Type:	Conference Paper
Publication:	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs Elsevier Science.
Keywords:	liquid precursor pyrolysis;magnesia/periclase;spinel;phase selection;phase evolution.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	02 Jun 2009 06:36
Last Modified:	19 Sep 2010 05:25
URI:	http://eprints.iisc.ac.in/id/eprint/18898

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