A Study on the Fabrication of Bi-(Pb)-Sr-Ca-Cu-O Thick Films by using SrCaCu2O4、SrCaCu4O6 and Ag as a Substrate

• Main Authors: Kao,Sheng Jou, 高勝洲
• Other Authors: Lin, Tze Yi
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/85052452075631729779

碩士 === 中原大學 === 應用物理學系 === 82 === The Bi-Sr-Ca-Cu-O superconducting thick films were grown by printing appropriate mixtures of Bi2O3+PbO and the BSCCO films with (Bi2O3+PbO)-doped on substrates of SrCaCu2O4 , SrCaCu4O6 and Ag separately, and then followed by a diffusion process at 700-900℃ according to the DTA data. The results from XRD reveal that the BSCCO films by using SrCaCu4O6 substrate are (2201) accompany with a little (2212) phase and for those by using SrCaCu2O4 substrate are (2212) phases dominantly. Both superconducting BSCCO films by R-T andχa.c.measurements show a mixed phases of (2223) and (2212) with Tc(onset)=110K and Tc( zero)=80K. The thickness of the BSCCO films are about 50um. They have shown to possess Tc=80K by SQUID and R-T measurements on Ag substrate. BSCCO films have shown a preferred orientation by XRD measurements. Because the excess oxygen causes degradation of the superconducting parameters of BSCCO thick films. Thereore , the grown thick films were annealed in N2 atomphere at 600℃ for 2 hr and cooled to room temperature at a rate of 500℃/hr. Tc of the as-grown thick films have enhanced up to 85k by the R-T measurement. In addition, the chemical composition of these samples as determined by EDS analysis are (Bi,Pb)2(Sr,Ca)3Cu2Ox.