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Grain-boundary chemistry and weak-link behavior of polycrystalline YBa[subscript 2]Cu[subscript 4]O[subscript 8]

Wang, Z. L. (Zhong Lin); Brynestad, J.; Kroeger, D. M.; Sun, Y. R.; Thompson, J. R.; Williams, R. K. (Georgia Institute of Technology, 1993-10)

Magnetic-susceptibility and grain-boundary-chemistry data were obtained on dense YBa[subscript 2]Cu[subscript 4]O[subscript 8] (Y1:2:4) samples. Transmission-electron microscopy showed that the grain boundaries were free ...

Strong, Asymmetric Flux Pinning by Miscut-Growth-Initiated Columnar Defects in Epitaxial YBa[subscript 2]Cu[subscript 3]O[subscript 7—chi] Films

Lowndes, D. H.; Christen, D. K.; Klabunde, C. E.; Wang, Z. L. (Zhong Lin); Kroeger, D. M.; Budai, J. D.; Zhu, Shen; Norton, D. P. (Georgia Institute of Technology, 1995-03-20)

Strong flux pinning and a pronounced asymmetric angular dependence of J[subscript c]([eta, theta]) have been discovered in YBa[subscript 2]Cu[subscript 3]O[subscript 7—chi] films grown on miscut, mosaic LaAlO[subscript 3] ...

Studies on Superplastically Deformed 123/Ag Composites

Goyal, A.; Wang, Z. L. (Zhong Lin); Sun, Y. R.; Kroeger, D. M.; Thompson, J. R.; Chou, Y. T.; Yun, Y.; Harmer, A. P. (Georgia Institute of Technology, 1995-05)

Composites containing 25 vol% Ag were compressed at room temperature to over 110% at 850°C in air. Measurement of the strain rate sensitivity yielded a value of 0.5, characteristic of superplastic deformation. As ...

Local texture and percolative paths for long-range conduction in high critical current density TlBa₂Ca₂Cu₃O₈₊ₓ deposits

Kroeger, D. M.; Goyal, A.; Specht, E. D.; Wang, Z. L. (Zhong Lin); Tkaczyk, J. E.; Sutliff, J. A.; DeLuca, J. A. (Georgia Institute of Technology, 1994-01-03)

A possible microstructural origin of the high critical current densities which have been obtained in c-axis-aligned, polycrystalline TlBa₂Ca₂Cu₃O₈₊ₓdeposits has been identified. The results of x-ray diffraction determinations ...

Texture and transport in spray pyrolyzed TlBa₂Ca₂Cu₃O₉ thick films

Tkaczyk, J. E.; Sutliff, J. A.; DeLuca, J. A.; Bednarczyk, P. J.; Briant, C. L.; Wang, Z. L. (Zhong Lin); Goyal, A.; Kroeger, D. M.; Lowndes, D. H.; Specht, E. D. (Georgia Institute of Technology, 1995-09)

The electron backscattering pattern technique has been applied to the microstructural investigation of Tl(1223) thick films formed by vapor-phase thallination of Ag-containing Ba–Ca–Cu–oxide precursors. For samples grown ...

Thermal stability and annealing of columnar defects in Bi₂Sr₂Ca₁Cu₂O₈/Ag superconductor

Thompson, J. R.; Paul, David; Wang, Z. L. (Zhong Lin); Kroeger, D. M.; Christen, D. K. (Georgia Institute of Technology, 1995-08-14)

This work establishes the stability at elevated temperatures of columnar defects, artificially formed in the Bi-based cupric oxide superconductor Bi₂Sr₂Ca₁Cu₂O₈ for enhanced vortex pinning. Isochronal anneals, conducted ...

Structural and chemical disorder near the Y₂BaCuO₅/YBa₂Cu₃O₇-δ interface and its possible relation to the flux-pinning behavior in melt-textured YBa₂Cu₃O₇-δ

Wang, Z. L. (Zhong Lin); Goyal, A.; Kroeger, D. M. (Georgia Institute of Technology, 1993-03-01)

Transmission-electron microscopy and energy-dispersive x-ray spectroscopy were used to study the microstructure of the YBa₂Cu₃O₇-δ (1:2:3) region adjacent to the Y₂BaCuO5/YBa₂Cu₃O₇-δ (2:1:1/1:2:3) interface. It is found ...