Eddy Current Sensing of Oxygen Content in High-Tc Superconductors

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1990
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Johnson, Ward
Kahn, A.
Chiang, C. K.
Wadley, H.
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.

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The superconducting properties of Ba2YCu3O7-x are strongly dependent on the amount of oxygen contained in the material. Although the physical mechanisms of oxidation have not yet been fully characterized, the reaction rates appear to be influenced by surface adsorption, in addition to bulk diffusion [1,2]. The task of constructing an optimal high-temperature processing schedule is, therefore, complicated by the fact that porosity and surface conditions strongly influence oxidation. An additional complication arises from the fact that, while the diffusion and adsorption rates increase with increasing temperature, the equilibrium oxygen concentration in the material decreases with increasing temperature, so that, after the final annealing, cooling must proceed slowly enough to allow adequate absorption to occur.

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Mon Jan 01 00:00:00 UTC 1990