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 at900C via two steps upon calcination: (i) decomposition of hydrotalcite at lower temperatures (400‐800C) and (ii) solid-state reaction between MgO (decomposed from hydrotalcite) and g-Al2O3 (derived from NH4Al(OH)2CO3 .H2O) at higher temperatures (>800C). The eAect of calcination temperature on particle morphology and sinterability of the resultant spinel powders were investigated. # 2001 Elsevier Science Ltd. All rights reserved.
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