Unexpected metastable transition in high superheating state
By high temperature microscopy, we conducted in-situ observation on the evolution of peritectic melting of YBa2Cu3O7−y thin films (denoted as the α phase). As the α phase was highly superheated above a critical temperature, we found that a non-equilibrium phase transition occurred. An unexpected met...
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Veröffentlicht in: | Journal of applied physics 2012-11, Vol.112 (10) |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | By high temperature microscopy, we conducted in-situ observation on the evolution of peritectic melting of YBa2Cu3O7−y thin films (denoted as the α phase). As the α phase was highly superheated above a critical temperature, we found that a non-equilibrium phase transition occurred. An unexpected metastable Y2O3 phase (denoted as the γ phase), resulted from the decomposition of the α film, nucleated preferentially to the stable phase of Y2BaCuO5 (denoted as the β phase). Both high superheating capability of the α film and low interface energy of the γ phase with substrates are responsible for the metastable phase transition in this work. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.4766446 |