Abstract
A precursor for Mg-Al spinel has been synthesized via the precipitation method, using ammonium bicarbonate as the precipitant. The precursor was composed of crystalline ammonium dawsonite hydrate [NH4Al(OH)2CO3·H2O] and hydrotalcite [Mg6Al2(CO3)(OH)16·4H2O] phases. The precursor converted to pure spinel phase at approximately 900 °C via two steps upon calcination: (i) decomposition of hydrotalcite at lower temperatures (400-800 °C) and (ii) solid-state reaction between MgO (decomposed from hydrotalcite) and γ-Al2O3 (derived from NH4Al(OH)2CO3·H2O) at higher temperatures (>800 °C). The effect of calcination temperature on particle morphology and sinterability of the resultant spinel powders were investigated.
Original language | English |
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Pages (from-to) | 139-148 |
Number of pages | 10 |
Journal | Journal of the European Ceramic Society |
Volume | 21 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2001 Feb |
Externally published | Yes |
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry