Formation of phase intergrowth in the syntheses of Bi-superconducting thin films

Phase intergrowth among some kinds of the Bi2Sr2Can−1CunOy phases is observed in the thin film fabrication at ultralow co-deposition with multitargets by means of ion beam sputtering. The molar fraction of the Bi2212 phase in the mixed crystal of the grown films is investigated as a function of the...

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Veröffentlicht in:Applied Physics Letters 1997-03, Vol.70 (11), p.1471-1473
Hauptverfasser: Ota, Hiroyuki, Sakai, Kazuo, Mori, Zon, Aoki, Ryozo
Format: Artikel
Sprache:eng
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Zusammenfassung:Phase intergrowth among some kinds of the Bi2Sr2Can−1CunOy phases is observed in the thin film fabrication at ultralow co-deposition with multitargets by means of ion beam sputtering. The molar fraction of the Bi2212 phase in the mixed crystal of the grown films is investigated as a function of the applied ozone pressure and the substrate temperature. The activation energy for the phase transformation from the Bi2201 to the Bi2212 is estimated in terms of the Avrami equation. This study reveals that the formation of a liquid phase contributes significantly to the construction of the Bi2212 phase in the thin films, differing from the bulk synthesis.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.118565