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Titolo:
Synthesis of Mg-Al spinel powder via precipitation using ammonium bicarbonate as the precipitant
Autore:
Li, JG; Ikegami, T; Lee, JH; Mori, T; Yajima, Y;
Indirizzi:
Natl Inst Res Inorgan Mat, Tsukuba, Ibaraki 3050044, Japan Natl Inst Res Inorgan Mat Tsukuba Ibaraki Japan 3050044 ki 3050044, Japan
Titolo Testata:
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
fascicolo: 2, volume: 21, anno: 2001,
pagine: 139 - 148
SICI:
0955-2219(200102)21:2<139:SOMSPV>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNESIUM-ALUMINUM SPINEL; MGAL2O4 SPINEL; ALKOXIDE; GEL; HYDROXIDE;
Keywords:
calcination; MgAl2O4; powders-chemical preparation; sintering; spinels;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Li, JG Natl Inst Res Inorgan Mat, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan Natl Inst Res Inorgan Mat Namiki 1-1 Tsukuba Ibaraki Japan 3050044
Citazione:
J.G. Li et al., "Synthesis of Mg-Al spinel powder via precipitation using ammonium bicarbonate as the precipitant", J EUR CERAM, 21(2), 2001, pp. 139-148

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)(2)CO3.H2O] and hydrotalcite [Mg6Al2(CO3)(OH)(16). 4H(2)O] phases. The precursor converted topure spinel phase at similar to 900 degreesC via two steps upon calcination: (i) decomposition of hydrotalcite at lower temperatures (400-800 degreesC) and (ii) solid-state reaction between MgO (decomposed from hydrotalcite)and gamma -Al2O3 (derived from NH4Al(OH)(2)CO3.H2O) at higher temperatures( > 800 degreesC). The effect of calcination temperature on particle morphology and sinterability of the resultant spinel powders were investigated. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 26/09/20 alle ore 04:46:01