skip to main content

Title: An experimental verification of a criterion for forming metastable phases in containerless solidification

On the thermodynamic condition for forming a metastable phase from undercooled melt in a containerless state, we had proposed a criterion that crystals will preferentially form if they have a smaller entropy of fusion than the entropy of fusion of equilibrium crystals (Kuribayashi et al., Mater. Sci. Eng., A 449–451, 675 (2007)). This criterion is proposed for being applied to materials that exhibit a faceted interface, such as semiconductors and oxides. However, no experimental data that support this criterion have been obtained. From this point, we used an aerodynamic levitator as a tool for forming metastable phases from undercooled melt and verified the above-mentioned criterion using LnFeO{sub 3} (Ln: lanthanide and Y) as the model material. In addition, the condition for double recalescence, which corresponds to forming metastable phases and stable phases, was discussed in terms of competitive 2D isomorphic nucleation of the metastable phase and 3D polymorphic nucleation of the stable phase.
Authors:
 [1] ;  [2] ; ;  [1] ; ;  [3]
  1. Shibaura Institute of Technology, Toyosu, Koto, Tokyo 135-8548 (Japan)
  2. (Japan)
  3. ISAS/JAXA, Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan)
Publication Date:
OSTI Identifier:
22402885
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 15; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRYSTALS; ENTROPY; EQUILIBRIUM; INTERFACES; IRON OXIDES; NUCLEATION; PHASE STABILITY; RARE EARTH COMPOUNDS; SEMICONDUCTOR MATERIALS; SOLIDIFICATION; THERMODYNAMICS; YTTRIUM COMPOUNDS