Abstract:
=========
Defects or impurities, surface or grain boundaries segregations, are known to
be very harmful for superconducting materials, especially for RF applications.
A wide range of techniques exists to explore either the global purity or very
localized places of the material. This paper reviews some of the techniques
which were used at Saclay or with close collaborators, along with their
limitations and/or complementarity. Two domains are described : the behavior
of material at cryogenic temperature, with our recent improvements in measuring
the usual superconducting parameters and localized chemical analysis
techniques.
|
