Process using supercritical conditions for producing highly accu

Details Process using supercritical conditions for producing highly accu Process using supercritical conditions for producing highly accu

1988-06-02

1991-04-30

Roy, Upendra

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

23293R, 156621, 203 49, 423592, 505734, B01D 306, H01L 3912

Patent

active

050118196

ABSTRACT:
A process is disclosed for the formation of a uniform and homogeneous mixture of a plurality of compounds in a desired stoichiometric ratio as a precipitate from a fluid under supercritical processing conditions which comprises dissolving at a first supercritical temperature a stoichiometric mixture of compounds in a fluid in a closed reaction vessel having a fixed first volume and rapidly expanding the volume in which the fluid is confined to lower the density sufficiently to cause the stoichiometric mixture of compounds to precipitate as a unifrom and stoichiometrically accurate mixture of the compounds, preferably without changing the phase of the fluid. The process may be used to form a high quality superconductor material because of the uniform and homogeneous distribution of the precipitated components in a stoichiometrically accurate ratio throughout said mixture.

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