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16 Result(s)

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  1. No Access

    Article

    Aligned conical carbon nanotubes

    Aligned conical carbon nanotubes (CCNTs) have been synthesized on catalyst-coated Si (100) substrates by a D.C. plasma-assisted hot filament chemical vapor deposition process. The same technique under slightly...

    Yan Chen, Li** Guo, S. Patel, D. T. Shaw in Journal of Materials Science (2000)

  2. No Access

    Article

    Degradation and Recovery of Transport Properties of Strained HTS Conductors

    Mechanical bending of HTS tapes can result in the deterioration and destruction of their transport properties. Depending on the magnitude and type of strain (tensile or compressive), the films can be permanent...

    S. Patel, J. Ye, T. Haugan, S. Chen, S. S. Li, F. Wong… in MRS Online Proceedings Library (1992)

  3. No Access

    Article

    Superconducting Behavior of YBa2Cu3O6.8/Bi2Sr2CanCun+1Ox Multilayers

    Composite YBCO/BSCCO films on MgO(lOO) substrates were fabricated by using laser deposition. The structures and transport properties of these composite films were studied. The model of 3D percolating network i...

    E. Narumi, J. Lee, C. Li, S. Patel, D. T. Shaw in MRS Online Proceedings Library (1992)

  4. No Access

    Article

    Critical current and microstructure of uniaxially aligned, polycrystalline YBa2Cu3O7−δ

    Three processing routes that generate uniaxial alignment but otherwise yield very different microstructure and critical current are compared. Fine grain size and c-axis alignment are obtained in magnetically a...

    J. E. Tkaczyk, C. L. Briant, J. A. DeLuca, E. L. Hall… in Journal of Materials Research (1992)

  5. No Access

    Article

    Microstructures in Y-Ba-Cu-O Thin Films Investigated by XAFS Techniques

    Superconducting films of YBa2Cu3O7-6 obtained by laser ablation on MgO and ZrO2 substrates were investigated by soft x-ray absorption fine structure technique (XAFS) at O K-edge. Local environment around oxygen a...

    A. Krol, Z. H. Ming, C. S. Lin, Y. L. Soo, C. X. Gu… in MRS Online Proceedings Library (1990)

  6. No Access

    Article

    Flexible stainless steel foil as a substrate for superconducting Y-Ba-Cu-O films

    As-deposited superconducting Y-Ba-Cu-O films have been grown on stainless steel substrates by the plasma assisted laser deposition technique. Low interfacial diffusion of iron at the 550°C growth temperature e...

    S. Witanachchi, S. Patel, Y. Z. Zhu, H. S. Kwok… in Journal of Materials Research (1990)

  7. No Access

    Article

    Critical Current Density of Narrow Superconducting Thin Films Fabricated by Laser Ablation Techniques

    The variations of critical current density Jc of narrow Y-Ba-Cu-O films as a function of temperature and magnetic field are investigated. Films with thickness of 150-200 nm and width of 20-100 urn were prepared b...

    L. W. Song, Y. H. Kao, Q. Y. Ying, J. P. Zheng… in MRS Online Proceedings Library (1989)

  8. No Access

    Article

    Soft X-Ray Studies of Y-Ba-Cu-O Thin Films Prepared by Laser Ablation

    Angular variation of x-ray fluorescence due to oxygen atoms in high-T Y-Ba-Cu-O thin films is measured for the first time by using a new parallel plate avalanche chamber. This technique allows the possibility ...

    A. Krol, C. J. Sher, D. R. Storch, L. W. Song, Y. H. Kao… in MRS Online Proceedings Library (1989)

  9. No Access

    Article

    Laser Patterning and Electrical Properties of Submicron Lines of Y-Ba-Cu-O

    0.6 µm-wide lines of high Tc Y-Ba-Cu-O have been fabricated by direct laser writing on mirror-like thin films which were grown by laser deposition without post annealing. Laser ablation etching had no effect on t...

    J. P Zheng, Q. Y. Ying, H. S. Kim, D. Bhattacharya… in MRS Online Proceedings Library (1989)

  10. No Access

    Article

    Study of In-Situ Laser-Deposition of Superconducting Thin Films by In-Situ Resistance Measurement

    The electric resistance was measured in real time during laser evaporation deposition of superconducting thin films. It was found that different substrates led to different behaviors in the temporal change of ...

    Q. Y. Ying, H. S. Kim, D. T. Shaw, H. S. Kwok in MRS Online Proceedings Library (1989)

  11. No Access

    Article

    Y1Ba2Cu3O7-x Films from Nitrate Solution using Rf Plasma Deposition

    A nitrate solution of Y, Ba and Cu was atomized and introduced into an inductively coupled argon - oxygen plasma operated at 4.4 kW and 13.56 MHz under atmospheric pressure. As-deposited superconducting films ...

    A. Shah, T. Haugan, S. Witanachchi, S. Patel, D. T. Shaw in MRS Online Proceedings Library (1989)

  12. No Access

    Article

    Fabrication of High TC Superconducting Composite Structure

    The laser ablation technique was used to fabricate high Tc superconducting composite structures. The multilayered structures were fabricated in-situ by changing the target during deposition. Thin MgO films and yt...

    J. Chang, L. W. Song, R. Barone, P. Bush, F. Yang… in MRS Online Proceedings Library (1989)

  13. No Access

    Article

    Superconducting properties of mixtures of Y1Ba2Cu3O9−x and Y1.8Ba0.2Cu1O5−y

    The superconducting properties of heat-treated mixtures of Y1Ba2Cu3O9−x (A) and Y1.8Ba0.2Cu1O5−y (B) have been studied. As the concentration of B increases, the Meissner effect decreases, while the resistance jum...

    X. W. Wang, H. S. Kwok, L. Shi, J. P. Zheng, P. Mattocks… in Journal of Materials Research (1988)

  14. No Access

    Article

    Growth of Highly Oriented CdsXSe1.X Thin Films By Uv Laser Evaporation Deposition

    CdSxSe1−x thin films have been grown by uv laser-evaporation deposition in a clean vacuum environment. The films have their c-axis perpendicular to the surface, and are optically smooth and homogeneous. These hig...

    H. S. Kwok, P. Mattocks, D. T. Shaw, L. Shi, X. W. Wang… in MRS Online Proceedings Library (1987)

  15. No Access

    Article

    Laser Induced Deposition of YBa2Cu3O7−x Thin Films

    We describe here the deposition of the YBaCuO superconducting thin films by the laser evaporation technique. The characterization of this process, and possible optimization with regards to wavelength and pulse...

    H. S. Kwok, P. Mattocks, D. T. Shaw, L. Shi, X. W. Wang… in MRS Online Proceedings Library (1987)

  16. No Access

    Article

    Laser Induced Deposition of YBa2Cu3O7−x Thin Films

    We describe here the deposition of the YBCO superconducting thin films by the laser evaporation technique. The characterization of this process, and possible optimization with regards to wavelength and pulse d...

    H. S. Kwok, P. Mattocks, D. T. Shaw, L. Shi, X. W. Wang… in MRS Online Proceedings Library (1987)