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Crystallographic Stability of Metastable Phase Formed by Containerless Processing in REFeO3 (RE: Rare-Earth Element)Undercooling a melt often facilitates a metastable phase to nucleate preferentially. Although the classical nucleation theory shows that the most critical factor for forming a metastable phase is the interface free energy, the crystallographic stability is also indispensable for the phase to be frozen at ambient temperature. In compound materials such as oxides, authors have suggested that the decisive factors for forming a critical nucleus are not only the free energy difference but also the difference of the entropy of fusion between stable and metastable phases. In the present study, using REFeO3 (RE: rare-earth element) as a model material, we investigate the formation of a metastable phase from undercooled melts with respect to the competitive nucleation and crystallographical stabilities of both phases.
Document ID
20120015589
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Kuribayashi, Kazuhiko (Shibaura Inst. of Tech. Tokyo, Japan)
Kumar, M. S. Vijaya (Japan Aerospace Exploration Agency Kanagawa, Japan)
Date Acquired
August 26, 2013
Publication Date
September 1, 2012
Publication Information
Publication: Materials Research in Microgravity 2012
Subject Category
Inorganic, Organic And Physical Chemistry
Distribution Limits
Public
Copyright
Public Use Permitted.

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