Processing and Fabrication of High Temperature Oxide Superconductors
Abstract
Synthesis of YBa2Cu3O7-a superconductor powders by freeze-drying was developed. The freeze-drying process consists of forming a solution of Y and Cu nitrates and Ba acetate, freezing, sublimating the water and calcination. The effect of processing variables on the powder characteristics, including surface area, size, stoichiometry, agglomeration, were investigated. Stoichiometry control requires control of the chemistry of the system, and careful analysis of starting solutions is required to prepare powders of the desired composition. Powders were sintered into pellets and the superconducting behavior was evaluated. Stanford University served as a subcontractor and was responsible for most of the critical transition temperature and critical current measurements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1992
- Accession Number
- ADA258281
Entities
People
- Michael I. Gusman
- Sylvia M. Johnson
Organizations
- SRI International