Synthesis of Mg-Al spinel powder via precipitation using ammonium bicarbonate as the precipitant

Ji Guang Li, Takayasu Ikegami, Jong Heun Lee, Toshiyuki Mori, Yoshiyuki Yajima

Research output: Contribution to journalArticle

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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 languageEnglish
Pages (from-to)139-148
Number of pages10
JournalJournal of the European Ceramic Society
Volume21
Issue number2
DOIs
Publication statusPublished - 2001 Feb 1
Externally publishedYes

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hydrotalcite
Ammonium bicarbonate
Powders
Calcination
Hydrates
Solid state reactions
Ammonium Compounds
Temperature
Crystalline materials
Decomposition
spinell
ammonium bicarbonate

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Synthesis of Mg-Al spinel powder via precipitation using ammonium bicarbonate as the precipitant. / Li, Ji Guang; Ikegami, Takayasu; Lee, Jong Heun; Mori, Toshiyuki; Yajima, Yoshiyuki.

In: Journal of the European Ceramic Society, Vol. 21, No. 2, 01.02.2001, p. 139-148.

Research output: Contribution to journalArticle

Li, Ji Guang ; Ikegami, Takayasu ; Lee, Jong Heun ; Mori, Toshiyuki ; Yajima, Yoshiyuki. / Synthesis of Mg-Al spinel powder via precipitation using ammonium bicarbonate as the precipitant. In: Journal of the European Ceramic Society. 2001 ; Vol. 21, No. 2. pp. 139-148.
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