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Title: Synthesis of magnesium–aluminium spinel from autoignition of citrate–nitrate gel
Authors: Behera, S K
Barpanda, P
Pratihar, S K
Bhattacharyya, S
Keywords: Autoignition
Citrate–nitrate gel
Black ash
Order–disorder Mag–Al spinel
Issue Date: Mar-2004
Publisher: Elsevier
Citation: Materials Letters, Vol 58, Iss 9, P 1451-1455
Abstract: Magnesium–aluminium spinel has been synthesized by citrate–nitrate route using hydrated nitrates of Mg and Al as the precursors with a citrate–nitrate ratio of 1:1. Self-ignition of the gel-like mass yielded a black mass, which crystallized to Mag–Al spinel on calcination at 650 °C for 9 h. The crystallized mass was a mixture of ordered and disordered phases of Mag–Al spinel. Phase pure-ordered spinel could be obtained for powders calcined at 1100 °C and above. The green compacts of the spinel powders could be sintered to near theoretical density at 1150 °C for 30 min. The activation energy for densification was calculated (16.4 kcal/mol) assuming Arrhenius type behaviour. The densification mechanism could be assigned to the ordering of the disordered spinel involving vacancy diffusion through the surface.
Description: Copyright of this article belongs to Elsevier Science Ltd
Appears in Collections:Journal Articles

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