TY  - JOUR
AU  - Nugroho, S.
AU  - Chen, Z-C.
AU  - Kawasaki, A.
AU  - Jarligo, M.O.
TI  - Solid-state synthesis and formation mechanism of barium hexaaluminate from mechanically activated Al2O3-BaCO3 powder mixtures
JO  - Journal of alloys and compounds
VL  - 502
SN  - 0925-8388
CY  - Lausanne
PB  - Elsevier
M1  - PreJuSER-23061
SP  - 466 - 471
PY  - 2010
N1  - The first author (SN) gratefully acknowledges the Ministry of Education, Culture, Sports, Science and Technology of Japan, for providing financial support during the study and this research at Tohoku University.
AB  - The synthesis and formation mechanism of barium hexaaluminate compound (Ba-P-Al2O3) by solid-state reactions between powdered reactants of alumina (Al2O3) and barium carbonate (BaCO3) have been investigated. The processes for synthesizing Ba-beta-Al2O3 phase include mechanically activated milling of Al2O3-BaCO3 powder mixtures and subsequent solid-state reactions at high temperatures. The mechanically activated milling results in a significant decrease in the decomposition temperature of BaCO3, hence promotes its reactions with Al2O3. Almost monophasic Ba-beta-Al2O3 can be synthesized by 9-12 h ball milling, followed by heat treatment at 1500 C for 2 h. The formation of Ba-beta-Al2O3 phase includes three stages: (i) decomposition of BaCO3, (ii) formation and growth of spherical BaO center dot Al2O3 particles, and (iii) reaction between Al2O3 and BaO center dot Al2O3 to form Ba-beta-Al2O3 with an elongated morphology. (C) 2010 Elsevier B.V. All rights reserved.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000280471100042
DO  - DOI:10.1016/j.jallcom.2010.04.198
UR  - https://juser.fz-juelich.de/record/23061
ER  -