In situ x-ray investigation of the melting of Bi-Sr-Ca-Cu-O phases
Abstract
High-temperature x-ray studies of the melting of Bi2Sr2Ca1Cu2O8-δ/Ag composites have been undertaken in order to determine the factors that control the melting temperature and the various phases that form during the melt-processing part of the fabrication of these conductors. During the melting process, three distinct phases form and then dissolve in the Bi-rich liquid: first (Sr,Ca)1Cu1O2, then (Sr,Ca)2Cu1O3, and finally (Sr,Ca)O. Ag suppresses the melting point about 30 °C and as much as 10% Ag can dissolve in the Bi-rich liquid. A slight Bi excess also decreases the temperature where the Bi2Sr2Ca1Cu2O8-δ structure disappears and liquid forms.
- Publication:
-
Applied Physics Letters
- Pub Date:
- December 1991
- DOI:
- 10.1063/1.105605
- Bibcode:
- 1991ApPhL..59.3640P
- Keywords:
-
- Copper Oxides;
- High Temperature Superconductors;
- Melting Points;
- Phase Transformations;
- X Ray Analysis;
- Bismuth Oxides;
- Calcium Oxides;
- Crystal Growth;
- Strontium Compounds;
- Solid-State Physics