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

98 Citations (Scopus)

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

ASJC Scopus subject areas

  • Ceramics and Composites

Fingerprint Dive into the research topics of 'Synthesis of Mg-Al spinel powder via precipitation using ammonium bicarbonate as the precipitant'. Together they form a unique fingerprint.

  • Cite this