Relationship of Microstructures in YBa2Cu3O7−x with Growth Conditions and Superconducting Properties

Mingard, Ken; Romano, L. T.; Grovenor, C.R.M.; Cantor, B.

doi:10.1007/978-1-4684-1345-8_54

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…Mingard et al [10] reported that they could reduce the sintering temperature of Y-Ba-Cu-O by 40 ~ in an argon atmosphere, even when the superconducting properties are better than those of a sample annealed in air. Ra et al [9] insist that the role of an inert atmosphere is as follows.…”

Section: Resultsmentioning

confidence: 97%

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Enhancement in superconducting properties of Y-Ba-Cu-O thin films by post-annealing in an inert atmosphere

et al. 1992

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Y-Ba-Cu-O superconducting thin films were produced by ex situ r.f. magnetron sputtering. In the post-annealing procedure, several annealing conditions which were scheduled for heating rate and annealing atmosphere were tried systematically to determine major factors affecting the characteristics of post-annealed superconducting thin films. From the results of the study, it was found that the characteristics of the films are strongly dependent on the heating atmosphere rather than the heating cycle or heating time. Films with a high transition temperature were obtained by treatment in an argon atmosphere; this is considered to be attributable to the rapid atomic diffusion in tetragonal YBazCu3OT_x due to the high oxygen vacancy concentration and the expanded lattice in an inert atmosphere during heat treatment.

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Section: Resultsmentioning

confidence: 97%

“…In case of bulk superconductor, it has been reported [9,10] that the inert atmosphere enhances the grain growth, resulting in an improvement of electrical properties. Introduction of argon gas during heat treatment of the thin films is also expected to be effective in promoting atomic diffusion, as reported in the bulk.…”

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confidence: 99%

Enhancement in superconducting properties of Y-Ba-Cu-O thin films by post-annealing in an inert atmosphere

et al. 1992

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“…30 The microstructures of the films have been studied in some detail to identify the impurity phase distribution and defect content. The films were amorphous and insulating after deposition, and were annealed in O 2 at temperatures above 900 °C to render them superconducting.…”

Section: Experimental Details and Electrical Measurementsmentioning

confidence: 99%

A comparative study of the electrical properties and microstructure of polycrystalline YBaCuO and thallium-based thin films

et al. 1991

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Thin films of YBCO and thallium-based superconductor compounds have been deposited with very similar polycrystalline structures. The critical current densities carried by the YBCO films are much lower than measured in the thallium films (<10 3 , as opposed to >10 4 A/cm 2 ). Grain boundaries in these films have been studied to correlate microstructure with the measured electrical properties. High defect densities and frequent microcracking have been observed at and around the boundaries in the YBCO films, but these defects are not seen in the thallium-based films. We suppose that this difference is because of the higher differential thermal expansion stresses set up in YBCO during cooling. Our observations imply that eventual application of polycrystalline superconducting films prepared by an ex situ process is more likely for the thallium-based materials than for YBCO.

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Relationship of Microstructures in YBa2Cu3O7−x with Growth Conditions and Superconducting Properties

Cited by 2 publications

References 14 publications

Enhancement in superconducting properties of Y-Ba-Cu-O thin films by post-annealing in an inert atmosphere

Enhancement in superconducting properties of Y-Ba-Cu-O thin films by post-annealing in an inert atmosphere

A comparative study of the electrical properties and microstructure of polycrystalline YBaCuO and thallium-based thin films

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