Journal Article

PreJuSER-23061

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Solid-state synthesis and formation mechanism of barium hexaaluminate from mechanically activated Al2O3-BaCO3 powder mixtures

Nugroho, S. ; Chen, Z.-C. ; Kawasaki, A. ; Jarligo, M. O.FZJ*

2010
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2010.04.198

Abstract: 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.

Keyword(s): J ; Oxide materials (auto) ; Ba-beta-Al2O3 (auto) ; High-energy planetary ball milling (auto) ; Mechanical activation (auto) ; Solid-state synthesis (auto) ; X-ray diffraction (auto)

Note: 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.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellverfahren (IEK-1)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2010

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