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dc.contributor.authorBehera, S K-
dc.contributor.authorBarpanda, P-
dc.contributor.authorPratihar, S K-
dc.contributor.authorBhattacharyya, S-
dc.identifier.citationMaterials Letters, Vol 58, Iss 9, P 1451-1455en
dc.descriptionCopyright of this article belongs to Elsevier Science Ltden
dc.description.abstractMagnesium–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.en
dc.format.extent215747 bytes-
dc.subjectCitrate–nitrate gelen
dc.subjectBlack ashen
dc.subjectOrder–disorder Mag–Al spinelen
dc.titleSynthesis of magnesium–aluminium spinel from autoignition of citrate–nitrate gelen
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