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

doi:10.1016/S0955-2219(00)00188-6

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 journal › Article › peer-review

100 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 language	English
Pages (from-to)	139-148
Number of pages	10
Journal	Journal of the European Ceramic Society
Volume	21
Issue number	2
DOIs	https://doi.org/10.1016/S0955-2219(00)00188-6
Publication status	Published - 2001 Feb
Externally published	Yes

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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title = "Synthesis of Mg-Al spinel powder via precipitation using ammonium bicarbonate as the precipitant",

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.",

author = "Li, {Ji Guang} and Takayasu Ikegami and Lee, {Jong Heun} and Toshiyuki Mori and Yoshiyuki Yajima",

year = "2001",

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doi = "10.1016/S0955-2219(00)00188-6",

language = "English",

volume = "21",

pages = "139--148",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Synthesis of Mg-Al spinel powder via precipitation using ammonium bicarbonate as the precipitant

AU - Li, Ji Guang

AU - Ikegami, Takayasu

AU - Lee, Jong Heun

AU - Mori, Toshiyuki

AU - Yajima, Yoshiyuki

PY - 2001/2

Y1 - 2001/2

N2 - 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.

AB - 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.

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