Formation process of high Tc superconducting Bi-Pb-Ca-Sr-Cu-O thick films via melt solidification
Abstract
High Tc superconducting thick films Bi1.6Pb0.4Ca2Sr2Cu3Ox were prepared by the melt solidification process. The preparation conditions were optimized to obtain films with higher Tc. Rapid cooling of the molten samples to the heat treatment temperature of 855 °C produced superconducting films with a maximum Tc (zero) of 104 K. Slow cooling of the melt declined the superconducting properties of the films because of the formation of Ca2CuO3, which may prevent the formation of the 110 K phase, during cooling through the temperature range around 900 °C.
- Publication:
-
Applied Physics Letters
- Pub Date:
- December 1990
- DOI:
- 10.1063/1.104185
- Bibcode:
- 1990ApPhL..57.2597T
- Keywords:
-
- Heat Treatment;
- High Temperature Superconductors;
- Melts (Crystal Growth);
- Mixed Oxides;
- Phase Transformations;
- Solidification;
- Superconducting Films;
- Thick Films;
- Bismuth Oxides;
- Calcium Oxides;
- Cooling;
- Copper Oxides;
- Lead Oxides;
- Strontium Compounds;
- Temperature Dependence;
- Solid-State Physics