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Thermal behaviour of coprecipitated zinc-aluminium hydroxide gels, part 1
P K HALDAR, , T K PARYA
Published in -
2011
Volume: 60
   
Issue: 5
Pages: 292 - 295
Abstract
The effect of heat treatment on the coprecipitated zinc-aluminium binary hydroxide gel towards the formation of zinc-aluminate spinel precursor up to 1000 °C was investigated. A coprecipitated zinc-aluminium hydroxide gel was synthesized from water-soluble nitrate salts of respective ions with a 1 : 1 molar ratio of ZnO : Al 2O 3 at pH ∼8.5 using a combination of triethanol amine and ammonium hydroxide as a basic medium. The washed coprecipitated hydroxide gel was dried at 110 °C and heat treated at different temperatures up to 1000 °C and was examined with TG-DTA, XRD, FTIR and SEM studies. The coprecipitated zinc-aluminium hydroxide compound was observed to transform to a transient nanocrystalline zinc-aluminate spinel precursor at 400 °C. Further heat treatment at higher temperatures led to enhanced crystallinity of the zinc-aluminate spinel until formation of crystalline zinc-aluminate spinel powder at 1000 °C.
About the journal
JournalInterCeram: International Ceramic Review
Publisher-
ISSN0020-5214
Open AccessNo