Measuring the homogeneity of ceramic superconductors by eddy current probing

W. G. Jenks, P. Bouma, C. M. Rey, L. R. Testardi, J. Vinals

Research output: Contribution to journalArticlepeer-review

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The homogeneity of a bulk YBa2Cu3Ox sample prepared by standard methods has been determined. Measurements of the conductivity, Tc (by induction), and x-ray analysis showed no deviation from bulk material previously characterized as "homogeneous" in the literature; the sample was shown to be inhomogeneous by the eddy current method. We use the sample's response to multifrequency eddy current probing as a measure of homogeneity. This response is calculated from measurements of the complex impedance of a coil, which contains the sample, as a function of frequency. The homogeneity of the sample after being quenched in air from three successively higher temperatures (650, 700, 800°C) has also been determined. A rough conductivity profile in one dimension is obtained for all four sample conditions.

Original languageEnglish (US)
Pages (from-to)3417-3421
Number of pages5
JournalReview of Scientific Instruments
Issue number6
StatePublished - 1992


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