Processing of Mixed Oxide Superconductors,
Abstract
The most important conclusion was that the barriers pre venting useful super currents are rather widely spaced and this should make it easier to develop a process to eliminate them. It has become clear that two sets of critical current densities are involved in these materials, the currents between grains and the currents within grains. To distinguish between them we have to make the samples in the form of hollow cylinders and measure the flux in coils round the cylinders and within them. This apparatus is now working and we are in the process of calibrating it. We shall then be in a position to assess quantitatively the effects of various processing techniques. We are also assembling in inductance apparatus to measure AC losses, which will give further information on the current densities. The magnetic separation is proving a rather complex phenomenon. It is clear that particle size and anistropy are relevant parameters. The original geometries also led to clumping of the particles which may prevent efficient separation. Work on these problems is in progress on a redesigned apparatus. Keywords: Superconductivity. (mgm)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1987
- Accession Number
- ADA195615
Entities
People
- B. Micheelsen
- F. List
Organizations
- University of Cambridge