Chaudhuri, S P and Patra, S K (1997) Preparation and characterisation of transition metal ion doped mullite. British Ceramic Transactions, 96 (3). pp. 105-111. ISSN 0967-9782

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Pure mullite, with and without small amounts (=2%) of transition metal ions (Mn, Fe, Cr, and Tl) as dopants, has been synthesised by coprecipitating the hydroxides of Al, Si, and the dopant with ammonia. Water soluble salts and organometallic compounds were used as starting materials. The coprecipitates were calcined to mullite precursors which were then converted completely to mullite by sintering in air for 3 h at 1600 degrees C. The coprecipitates and calcined materials were characterised, and the purity and stoichiometry of the mullite determined by XRD, chemical analysis, DTA, and IR spectroscopy. The mullite properties, lattice parameters cell volumes X-ray densities, and the size and shape of the grains were determined by XRD, XRF, and SEM. The results showed that the dopant materials formed solid solutions in the mullite lattice causing expansion of the b and c axes and contraction of the a axis. The shape and size of calcined mullite grains were found to be related to the size of the dopant ion impurity being needle shaped for Fe and Ti, rectangular for Mn, and spheroidal for Cr.

Item Type: Article
Subjects: Microstructure and Characterization
Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 18 Jul 2012 08:04
Last Modified: 18 Jul 2012 08:04

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