Optimum synthetic conditions of ammonium aluminum carbonate hydroxide (AACH) as starting material for α-alumina fine powders

Koichi Hayashi, Seiji Toyoda, Kunihiko Nakashima, Kenji Morinaga

研究成果: ジャーナルへの寄稿記事

20 引用 (Scopus)

抄録

Ammonium aluminum carbonate hydroxide (AACH) as starting material to obtain α-alumina fine powders was synthesized between aqueous solutions of ammonium hydrogen carbonate (AHC) and ammonium alum (AA). The effects of pH of the AHC aqueous solution and reaction temperature on the formation of AACH are discussed. Three products, amorphous aluminum hydroxide, pseudoboehmite (= low crystalline boehmite) and AACH were formed depending on pH. AACH was mainly formed in alkaline aqueous solutions. Crystallite size of AACH decreased with increasing concentrations of ionic species [NH4 +]·[AlO(OH)2 -]· [HCO3 -] and decreasing reaction temperature. Homogeneous spherical α-alumina particles with a particle size of 0.2 μm were obtained by firing at 1050°C for 6h from the AACH with a crystallite size of 50 angstrom synthesized at a pH of 10.0 at 5°C.

元の言語英語
ページ(範囲)444-449
ページ数6
ジャーナルNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
98
発行部数5
出版物ステータス出版済み - 1990

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Aluminum Oxide
Carbonates
Aluminum
Ammonium Compounds
Powders
hydroxides
carbonates
Alumina
aluminum oxides
aluminum
Crystallite size
Bicarbonates
aqueous solutions
alum
Aluminum Hydroxide
Hydrated alumina
Hydrogen
hydroxide ion
hydrogen
Particle size

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

これを引用

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title = "Optimum synthetic conditions of ammonium aluminum carbonate hydroxide (AACH) as starting material for α-alumina fine powders",
abstract = "Ammonium aluminum carbonate hydroxide (AACH) as starting material to obtain α-alumina fine powders was synthesized between aqueous solutions of ammonium hydrogen carbonate (AHC) and ammonium alum (AA). The effects of pH of the AHC aqueous solution and reaction temperature on the formation of AACH are discussed. Three products, amorphous aluminum hydroxide, pseudoboehmite (= low crystalline boehmite) and AACH were formed depending on pH. AACH was mainly formed in alkaline aqueous solutions. Crystallite size of AACH decreased with increasing concentrations of ionic species [NH4 +]·[AlO(OH)2 -]· [HCO3 -] and decreasing reaction temperature. Homogeneous spherical α-alumina particles with a particle size of 0.2 μm were obtained by firing at 1050°C for 6h from the AACH with a crystallite size of 50 angstrom synthesized at a pH of 10.0 at 5°C.",
author = "Koichi Hayashi and Seiji Toyoda and Kunihiko Nakashima and Kenji Morinaga",
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T1 - Optimum synthetic conditions of ammonium aluminum carbonate hydroxide (AACH) as starting material for α-alumina fine powders

AU - Hayashi, Koichi

AU - Toyoda, Seiji

AU - Nakashima, Kunihiko

AU - Morinaga, Kenji

PY - 1990

Y1 - 1990

N2 - Ammonium aluminum carbonate hydroxide (AACH) as starting material to obtain α-alumina fine powders was synthesized between aqueous solutions of ammonium hydrogen carbonate (AHC) and ammonium alum (AA). The effects of pH of the AHC aqueous solution and reaction temperature on the formation of AACH are discussed. Three products, amorphous aluminum hydroxide, pseudoboehmite (= low crystalline boehmite) and AACH were formed depending on pH. AACH was mainly formed in alkaline aqueous solutions. Crystallite size of AACH decreased with increasing concentrations of ionic species [NH4 +]·[AlO(OH)2 -]· [HCO3 -] and decreasing reaction temperature. Homogeneous spherical α-alumina particles with a particle size of 0.2 μm were obtained by firing at 1050°C for 6h from the AACH with a crystallite size of 50 angstrom synthesized at a pH of 10.0 at 5°C.

AB - Ammonium aluminum carbonate hydroxide (AACH) as starting material to obtain α-alumina fine powders was synthesized between aqueous solutions of ammonium hydrogen carbonate (AHC) and ammonium alum (AA). The effects of pH of the AHC aqueous solution and reaction temperature on the formation of AACH are discussed. Three products, amorphous aluminum hydroxide, pseudoboehmite (= low crystalline boehmite) and AACH were formed depending on pH. AACH was mainly formed in alkaline aqueous solutions. Crystallite size of AACH decreased with increasing concentrations of ionic species [NH4 +]·[AlO(OH)2 -]· [HCO3 -] and decreasing reaction temperature. Homogeneous spherical α-alumina particles with a particle size of 0.2 μm were obtained by firing at 1050°C for 6h from the AACH with a crystallite size of 50 angstrom synthesized at a pH of 10.0 at 5°C.

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