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Proceedings Paper

Containerless solidification of BiFeO3 oxide under microgravity
Author(s): Jianding Yu; Yasutomo Arai; Naokiyo Koshikawa; Takehito Ishikawa; Shinichi Yoda
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Paper Abstract

Containerless solidification of BiFeO3 oxide has been carried out under microgravity with Electrostatic Levitation Furnace (ELF) aboard on the sounding rocket (TR-IA). It is a first containerless experiment using ELF under microgravity for studying the solidification of oxide insulator material. Spherical BiFeO3 sample with diameter of 5mm was heated by two lasers in oxygen and nitrogen mixing atmosphere, and the sample position by electrostatic force under pinpoint model and free drift model. In order to compare the solidification behavior in microgravity with on ground, solidification experiments of BiFeO3 in crucible and drop tube were carried out. In crucible experiment, it was very difficult to get single BiFeO3 phase, because segregation of Fe2O3 occured very fast and easily. In drop tube experiment, fine homogeneous BiFeO3 microstructure was obtained in a droplet about 300 μm. It implies that containerless processing can promote the phase selection in solidification. In microgravity experiment, because the heating temperature was lower than that of estimated, the sample was heated into Fe2O3+liquid phase region. Fe2O3 single crystal grew on the surface of the spherical sample, whose sample was clearly different from that observed in ground experiments.

Paper Details

Date Published: 6 July 1999
PDF: 8 pages
Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); doi: 10.1117/12.351281
Show Author Affiliations
Jianding Yu, National Space Development Agency of Japan (Japan)
Yasutomo Arai, National Space Development Agency of Japan (Japan)
Naokiyo Koshikawa, National Space Development Agency of Japan (Japan)
Takehito Ishikawa, National Space Development Agency of Japan (Japan)
Shinichi Yoda, National Space Development Agency of Japan (Japan)


Published in SPIE Proceedings Vol. 3792:
Materials Research in Low Gravity II
Narayanan Ramachandran, Editor(s)

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