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Preparation and characteristics of Bi-Pb-Sr-Ca-Cu-O superconducting films by spray pyrolysis and post-annealing
| Content Provider | Semantic Scholar |
|---|---|
| Author | Koo, Horng-Show Tseng, Tseung-Yuen |
| Copyright Year | 1998 |
| Abstract | Abstract Two kinds of high-Tc superconducting films, Bi1.8Pb0.2Sr2Ca2Cu3Oy and Bi2PbSr2Ca2Cu3Oy, were prepared by spray pyrolysis and post-annealing with the aid of Bi-based bulk. Highly c-oriented and nearly single-phase 2223 high-Tc Bi-based superconducting films can be achieved for the as-sprayed Bi1.8Pb0.2Sr2Ca2Cu3Oy and the Bi2PbSr2Ca2Cu3Oy films annealed at 845°C for 20 h. X-ray diffraction (XRD) patterns exhibit amorphous-like phases with microcrystals for the as-sprayed films and the transformation of amorphous-like phase into crystalline high-Tc (2223), low-Tc (2212) and Ca2PbO4 phases for the resultant films. For as-sprayed films, post-annealing in the closed system with Bi-based bulk sources is favourable to the formation of 2223 phase; on the contrary, the 2212 phase is formed in the open system, as demonstrated by XRD and scanning electron microscopy (SEM). SEM and XRD analyses show a plate-like microstructure for the 2223 phase and a needle-like one for the 2212 phase. This phenomenon explains that compensation and diffusion of Bi-based bulk sources into the as-sprayed films help in the formation of 2223 phase and these processes are more efficient in the closed system. The resultant film shows a high critical transition temperature (Tc,zero) of 104 K and a critical current density (Jc) of 1.8 × 104 A/cm2. |
| Starting Page | 226 |
| Ending Page | 235 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/S0254-0584(98)00184-9 |
| Volume Number | 56 |
| Alternate Webpage(s) | https://ir.nctu.edu.tw/bitstream/11536/31812/1/000076579800005.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/S0254-0584%2898%2900184-9 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
