Auger study of grain boundaries in large-grained YBa2Cu3Ox

Verhoeven, J. D.; Bevolo, A. J.; McCallum, R. W.; Gibson, E. D.; Noack, M. A.
February 1988
Applied Physics Letters;2/29/1988, Vol. 52 Issue 9, p745
Academic Journal
A scanning Auger microscopy study has been carried out on fractured surfaces of YBa2Cu3Ox samples prepared by standard sintering procedures from powders. It is concluded that in the large-grained samples examined, a majority of the grain boundaries are sufficiently ‘‘open’’ that standard metallographic preparation causes them to become contaminated with C. This suggests that an actual loss of contact at the grain boundaries during sample preparation is responsible for the low Jc values observed in bulk-sized large-grained YBa2Cu3Ox.


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