Abstract
The zone axis critical voltage effect of YBa2Cu3O7-y is investigated, in order to detect a local change in oxygen content and to examine ionic states of constituent atoms.The critical voltage is determined with an accuracy of 1~3% by observing convergent-beam electron diffraction discs or measuring the characteristic X-ray intensities. The Critical voltages calculated theoretically do not fit the measured values due to an uncertainty of scattering factors for ions, in particular for an oxygen ion. The calculated critical voltage changes linearly with a change in oxygen content and the slope is almost constant irrespective of values of the scattering factors used. A relative local change in oxygen content can be detected with an accuracy of 0.3~0.7% and the spatial resolution better than 0.1μm, by measuring the critical voltage, although an absolute value of oxygen content is not determined. Applying this technique to a melt-textured sample we observed a local change of 0.8% in 7-y near a dislocation.
Published Version
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