%0 Journal Article
%A Nugroho, S.
%A Chen, Z-C.
%A Kawasaki, A.
%A Jarligo, M.O.
%T Solid-state synthesis and formation mechanism of barium hexaaluminate from mechanically activated Al2O3-BaCO3 powder mixtures
%J Journal of alloys and compounds
%V 502
%@ 0925-8388
%C Lausanne
%I Elsevier
%M PreJuSER-23061
%P 466 - 471
%D 2010
%Z 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.
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000280471100042
%R 10.1016/j.jallcom.2010.04.198
%U https://juser.fz-juelich.de/record/23061