Measuring the homogeneity of ceramic superconductors by eddy current probing

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

doi:10.1063/1.1143745

Measuring the homogeneity of ceramic superconductors by eddy current probing

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

Physics and Astronomy (Twin Cities)

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Abstract

The homogeneity of a bulk YBa₂Cu₃O_x sample prepared by standard methods has been determined. Measurements of the conductivity, T_c (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 language	English (US)
Pages (from-to)	3417-3421
Number of pages	5
Journal	Review of Scientific Instruments
Volume	63
Issue number	6
DOIs	https://doi.org/10.1063/1.1143745
State	Published - 1992

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abstract = "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.",

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AU - Jenks, W. G.

AU - Bouma, P.

AU - Rey, C. M.

AU - Testardi, L. R.

AU - Vinals, J.

PY - 1992

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AB - 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.

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Measuring the homogeneity of ceramic superconductors by eddy current probing

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