Changes in fracture surface composition and morphology with time in vacuum in YBa2Cu3O7-x

Kroeger, D. M.; Brynestad, J.; Padgett, R. A.
April 1988
Applied Physics Letters;4/11/1988, Vol. 52 Issue 15, p1266
Academic Journal
Changes in fracture surface composition and morphology with time after fracture in a high vacuum environment are observed in the high transition temperature oxide superconductor YBa2 Cu3 O7-x . Morphological changes involving several grains and extending over distances of tens of microns are seen. Changes in fracture surface morphology are, at least in some cases, preceded by changes in surface composition as determined from Auger electron spectroscopy, and can occur at room temperature in the absence of electron beam excitation.


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