Jung, Y.M. Kim, S.W. 2024-01-12T07:56:00Z 2024-01-12T07:56:00Z 2022-03-07 2006-09 1012-0394 https://pubs.kist.re.kr/handle/201004/81573 The microwave-assisted combustion synthesis as a route to obtain ultrafine α-alumina and magnesium aluminate composite powders starting from the ammonium aluminum carbonate hydroxide precursor was investigated. The synthetic temperature and the crystallite size of the α-alumina nanocomposite powder were significantly affected by the environmental atmosphere in the microwave assisted combustion. The α-alumina and spinel composite powder was obtained by the microwave-assisted combustion at temperature of 1000°C under H2/N2, but at 1150°C by the normal heat process under air. The rapid transformation from γ- to α-phase was achieved by microwave assisted nucleation at low temperature of 900°C under H 2/N2 atmosphere. The least crystallite size of 26.2 nm was obtained under H2/N2 atmosphere at 1000°C for 10 min. English Materials Research Society Rapid transformation of α-alumina nanocomposite powders by microwave assisted combustion Conference 10.4028/3-908451-31-0.823 1 IUMRS International Conference in Asia 2006, IUMRS-ICA 2006, pp.823 - 826 IUMRS International Conference in Asia 2006, IUMRS-ICA 2006 823 826 US Jeju 2006-09-10 Solid State Phenomena 2-s2.0-38549165852