Patent ID: 6191075
Filing Date: 2001-02-20
Classification: C04B,H01L

Abstract:
A method of preparing a high temperature superconducting 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 Angstroms in diameter; and(c) combining said ultra-fine grained superparamagnetic particles with said powdered high temperature superconductor to form a solid mass comprised of crystalline grains of said superparamagnetic particles and said powdered high temperature superconductor, said superparamagnetic particles constituting about 0.1-0.3% by weight of the total, and having grain boundaries between said grains of said powdered high temperature superconductor and a dispersion of said superparamagnetic particles on the grain boundaries, thereby enhancing intergrain critical current density of said high temperature superconducting material.