Crystallographic Stability of Metastable Phase Formed by Containerless Processing in REFeO3 (RE: Rare-Earth Element)

Undercooling a melt often facilitates a metastable phase to preferentially nucleate. In case of REFeO3 (RE: Rare-earth element), although the equilibrium phase is perovskite, the space group of which is Pbnm, metastable hexagonal phases of P63cm or P63/mmc are formed from the deeply undercooled melt...

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Bibliographic Details
Published in:AIP conference proceedings 2012-03
Main Authors: Kuribayashi, Kazuhiko, Vijaya Kumar, M S
Format: Article
Language:English
Subjects:
Criteria
Crystallography
Hexagonal phase
Melts
Metastable phases
Rare earth metals
Stability
Tolerances
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Summary:Undercooling a melt often facilitates a metastable phase to preferentially nucleate. In case of REFeO3 (RE: Rare-earth element), although the equilibrium phase is perovskite, the space group of which is Pbnm, metastable hexagonal phases of P63cm or P63/mmc are formed from the deeply undercooled melt. The stability of perovskite structure can be well described by the tolerance factor TF. That is, TF=1: ideal, 0.8
ISSN:0094-243X