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Method for Classification of Superconducting Powders Based On Particle Tc

IP.com Disclosure Number: IPCOM000101032D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Goland, D: AUTHOR [+2]

Abstract

This article describes a method for classifying particles with different superconducting transition temperatures, and separating them from a bulk sample. The method is to levitate particles in a pulsating magnetic field and form a suspension in a liquid which can then be separated and the particles recovered.

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Method for Classification of Superconducting Powders Based On Particle Tc

       This article describes a method for classifying particles
with different superconducting transition temperatures, and
separating them from a bulk sample.  The method is to levitate
particles in a pulsating magnetic field and form a suspension in a
liquid which can then be separated and the particles recovered.

      The method of separating particles with various critical
temperatures described here relies on the fact that below a
particle's critical temperature it will exclude magnetic flux.  This
phenomena can be utilized in such a way as to cause a particle to
levitate in the presence of a magnetic field.  The operation would
entail placing a batch of powder consisting of particles with various
critical temperatures in a vessel containing a supercritical fluid
and subjecting it to a pulsed magnetic field.  At a given
temperature, all of the particles whose critical temperature was
above the operating temperature would remain on the bottom of the
vessel.  If the levitated particles are sufficiently small, they will
become suspended in the surrounding liquid, which can then be
siphoned from the vessel and the particles recovered.  It is
important to note that the particles should be of uniform size to
eliminate any effect from sedimentation on the classification.

      In order to facilitate such an operation an apparatus, such as
the one in the figure, could be used.  Th...