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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of applied physics 2012-11, Vol.112 (10)
Hauptverfasser: Chen, Y. Y., Fang, T. F., Li, W., Yan, S. B., Yao, X., Xiong, J., Tao, B. W.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4766446