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http://hdl.handle.net/2080/41
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 |
URI: | http://hdl.handle.net/2080/41 |
Appears in Collections: | Journal Articles |
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File | Description | Size | Format | |
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bhatta3.pdf | 210.69 kB | Adobe PDF | View/Open |
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