Appeal No. 1997-0534
Application 08/171,904
constitute all the pending claims in the application.
The invention relates to a method of preparing a high
temperature superconductor. High temperature superconductor
materials are polycrystalline, and the grain boundaries of
these materials can act as weak links causing drastic
reduction in current transport across the grain boundaries,
thereby degrading electrical transport properties. The
invention is intended to improve electrical transport
properties by ameliorating the grain boundary weak links.
This is achieved by adding ultra-fine grained
superparamagnetic particles to the grain boundaries of the
polycrystalline superconductor material. The invention is
further illustrated by the following claim.
1. A method of preparing a high temperature
superconducing material, comprising the steps of:
(a) providing a powdered high temperature superconductor
having particles of micron size range;
(b) providing ultra-fine grained superparamagnetic
particles having diameters of from about 10 to 500 Angstroms,
and having a localized magnetic susceptibility behavior
arising from their size being in the range of about 10 to 500
2
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