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Preparation of Superconducting Ba 2 YCu 3 O 7-y Films by the Dipping-Pyrolysis Process at 700° and 750°C

1991; Institute of Physics; Volume: 30; Issue: 1A Linguagem: Inglês

10.1143/jjap.30.l28

1347-4065

Toshiya Kumagai, T. Manabe, W. Kondo, Susumu Mizuta,

ZnO doping and properties

Superconducting Ba 2 YCu 3 O 7- y (BYCO) films were prepared by the dipping-pyrolysis process using metal acetylacetonates as starting materials through heat treatments below 800°C under controlled low oxygen partial pressures ( p (O 2 )'s) followed by O 2 annealing. Values of T c,zero ( r )'s were greatly dependent on the temperature and p (O 2 ) of heat treatment; they were 64 K and 85 K with the heat treatments at 700° and 750°C, respectively, under an initial p (O 2 ) of 2×10 -4 atm for 2-µm-thick BYCO films. Moreover, silver precoating was effective for improving the superconducting and surface properties of the films heat-treated at 700°C.