Containerless solidification of BiFeO3 oxide under microgravity

Jianding Yu; Yasutomo Arai; Naokiyo Koshikawa; Takehito Ishikawa; Shinichi Yoda

doi:10.1117/12.351281

6 July 1999 Containerless solidification of BiFeO3 oxide under microgravity

Jianding Yu, Yasutomo Arai, Naokiyo Koshikawa, Takehito Ishikawa, Shinichi Yoda

Proceedings Volume 3792, Materials Research in Low Gravity II; (1999) https://doi.org/10.1117/12.351281
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

Citation Download Citation

Jianding Yu, Yasutomo Arai, Naokiyo Koshikawa, Takehito Ishikawa, and Shinichi Yoda "Containerless solidification of BiFeO3 oxide under microgravity", Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); https://doi.org/10.1117/12.351281

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