Hyper- and Hypobaric Processing of T1-Ca-Ba-Cu-O Superconductors


Tl-based superconductors of initial composition Tl:Ca:Ba:Cu equal to 2:2:2:3 and 1:3:1:3 were heated in oxygen at pressures of 104 to 6 x 105 Pa. The 2:2:2:3 composition formed primarily the 2-layer superconductor with zero resistance from 77 to 104 K. The 1:3:1:3 composition formed nearly phase pure 3-layer superconductor with a maximum zero resistance temperature of 120 K. Application of hyperbaric pressure influenced phase purities and transition temperatures slightly; phase purities decreased significantly with application of hypobaric pressures.

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  1. 1

    A. Schilling, H. R. Ott, and F. Hulliger. Physica C 157. 144 (1989).

    Article  Google Scholar 

  2. 2

    D. S. Ginley, J. F. Kwak, E. L. Venturini. B. Morosin, and R. J. Baughman, Physica C 160. 42 (1989).

    CAS  Article  Google Scholar 

  3. 3

    I. K. Gopalakrishnan, P. V. P. S. S. Sastry, H. Rajagopal, A. Sequeira, J. V. Yakhmi. and R. M. Iyer, Physica C 159. 811 (1989) .

    CAS  Article  Google Scholar 

  4. 4

    K. C. Goretta, D. Shi, B. Malecki, M. C. Hash, and I. Bloom, Supercond. Sci. Tech. 2, 192 (1989).

    CAS  Article  Google Scholar 

  5. 5

    N. Uno, N. Enomoto, Y. Tanaka, and H. Takami. Jpn. J. Appl. Phys. 27, L1003 (1988).

    CAS  Article  Google Scholar 

  6. 6

    U. Balachandran, R. B. Poeppel, J. E. Emerson, S. A. Johnson. M. T. Lanagan. C. A. Youngdahl, D. Shi, K. C. Goretta, and N. G. Eror, Mater. Lett. 8. Dec. issue (1989).

  7. 7

    F. A. Karbarz, O. D. Lacy, K. C. Goretta, U. Balachandran, D. Shi, J. G. Chen, M. Xu, and M. C. Hash. Mater. Res. Bull.. in press.

  8. 8

    S. S. P. Parkin. V. Y. Lee. E. M. Engler. A. I. Nazzal, T. C. Huang. G. Gorman, R. Savoy, and R. Beyers, Phys. Rev. Lett. 60. 2539 (1988).

    CAS  Article  Google Scholar 

  9. 9

    R. M. Iyer. G. M. Phatak, K. Gangadharan, M. D. Sastry, R. M. Kadam. P. V. P. S. S. Sastry, and J. V. Yakhmi, Physica C 160. 155 (1989).

    CAS  Article  Google Scholar 

  10. 10

    Z. Z. Sheng, L. Sheng, H. M. Su. and A. M. Hermann. Appl. Phys. Lett. 53. 2686 (1988).

    CAS  Article  Google Scholar 

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Goretta, K.C., Routbort, J.L., Shi, D. et al. Hyper- and Hypobaric Processing of T1-Ca-Ba-Cu-O Superconductors. MRS Online Proceedings Library 169, 365–368 (1989). https://doi.org/10.1557/PROC-169-365

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