Detection of surface impurity phases in high T.sub.C superconduc

Details Detection of surface impurity phases in high T.sub.C superconduc Detection of surface impurity phases in high T.sub.C superconduc

1988-11-23

1989-10-10

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

With heating of luminophors

2504841, G01N 2300

Patent

active

048734446

ABSTRACT:
Detection of surface impurity phases in high-temperature superconducting materials. Thermally stimulated luminescence has been found to occur in insulating impurity phases which commonly exist in high-temperature superconducting materials. The present invention is sensitive to impurity phases occurring at a level of less than 1% with a probe depth of about 1 .mu.m which is the region of interest for many superconductivity applications. Spectroscopic and spatial resolution of the emitted light from a sample permits identification and location of the impurity species. Absence of luminescence, and thus of insulating phases, can be correlated with low values of rf surface resistance.

REFERENCES:
patent: 2573245 (1951-10-01), Boyd et al.
patent: 3317727 (1967-05-01), Medlin

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