Neutron powder diffraction study of the products from fluorinating YBa2Cu3O7−s at room temperature and at 400 °C

Abstract

Fluorination of YBa2Cu3O7−s at room temperature results in no change of the critical temperature but a drastic reduction of superconducting volume fraction as determined by magnetic flux exclusion measurements. Rietveld refinement of neutron powder diffraction data indicates that the bulk structure has not changed in any significant way despite the loss of superconductivity. In marked contrast, when the superconducting oxide is fluorinated at 400 °C, a structural transformation from orthorhombic to tetragonal symmetry occurs that is accompanied by essentially complete filling of eight of the nine perovskite anion sites and total loss of superconductivity above 7 K. Interpretation of neutron activation analysis and neutron diffraction results render the formula of the fluorinated product as YBa2Cu3F3.5O4.5, but fluoride ions in the unit cell were not distinguished from oxide ions.

This is a preview of subscription content, access via your institution.

References

  1. 1

    J. G. Bednorz and K. A. Muller, Z. Phys. B 64, 189 (1986).

    Article  Google Scholar 

  2. 2

    C. W. Chu, P. H. Hor, R. L. Meng, L. Gao, Z. J. Hung, and Y. Z. Wang, Phys. Rev. Lett. 58, 405 (1987).

    CAS  Article  Google Scholar 

  3. 3

    M. K. Wu, J. R. Ashburn, C. J. Torng, P. H. Hor, R. L. Meng, L. Gao, Z. J. Huang. Y. Q. Wang, and C. W. Chu, Phys. Rev. Lett. 58, 908 (1987).

    CAS  Article  Google Scholar 

  4. 4

    S. R. Ovshinsky, R. T. Young, D. D. Allred, G. DeMaggio, and G. A. van der Leeden, Phys. Rev. Lett. 58, 2579 (1987).

    CAS  Article  Google Scholar 

  5. 5

    H. Xian-Ren, R. Yan-Ru, L. Ming-Zhu, T. Quing-Yun, L. Zhen-Ren, S. Li-Hua, D. Wei-Qing, F. Min-Hua, M. Qing-Yun, L. Chang-Jiang, L. Xiu-Rai, Q. Guan-Liang, and C. Mou-Yuan, International Symposium on High Tc Superconductors, Beijing, Peoples Republic of China (1987).

  6. 6

    R. N. Bhargava, S. P. Herko, and W. N. Osborne, Phys. Rev. Lett. 59, 1468 (1987).

    CAS  Article  Google Scholar 

  7. 7

    B. M. Tissue, K. M. Cirillo, J. C. Wright, M. Daeumling, and D. C. Larbalestier, Solid State Commun. 65, 51 (1988).

    CAS  Article  Google Scholar 

  8. 8

    N. N. Sauer, E. Garcia, J. A. Martin, R. R. Ryan, P. G. Eller, J. R. Tesmer, and C. J. Maggiore, J. Mater. Res. 3, 813 (1988).

    CAS  Article  Google Scholar 

  9. 9

    A. C. Larson and R. B. Von Dreele, “GSAS—Generalized Crystal Structure Analysis System,” LA-UR-86-748, Los Alamos National Laboratory (1987).

  10. 10

    M. A. Beno, L. Soderholm, D. W. Capone, II, D. G. Hinks, J. D. Jorgensen, and I. K. Schuller, Appl. Phys. Lett. 51, 57 (1987).

    CAS  Article  Google Scholar 

  11. 11

    F. Beech, S. Miraglia, A. Santoro, and R. S. Roth, Phys. Rev. B 35, 8778 (1987).

    Article  Google Scholar 

  12. 12

    J. J. Capponi, C. Chaillout, A. W. Hewat, P. Lejay, M. Marezio, N. Nguyen, B. Raveau, J. L. Soubeyroux, J. L. Tholence, and R. Tournier, Europhys. Lett. 3, 1301 (1987).

    CAS  Article  Google Scholar 

  13. 13

    J. E. Greedan, A. H. O’Reilly, and C. V. Stager, Phys. Rev. B 35, 8770 (1987).

    Article  Google Scholar 

  14. 14

    A. Williams, G. H. Kwei, R. B. Von Dreele, I. D. Raistrick, and D. L. Bish, J. Phys. Rev. (submitted) (1988).

  15. 15

    A. Santoro, S. Miraglia, F. Beech, S. A. Sunshine, D. W. Murphy, L. F. Schneemeyer, and J. V. Waszczak, Mater. Res. Bull. 22, 1007 (1987).

    CAS  Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to E. Garcia.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Garcia, E., Sauer, N.N., Ryan, R.R. et al. Neutron powder diffraction study of the products from fluorinating YBa2Cu3O7−s at room temperature and at 400 °C. Journal of Materials Research 3, 819–824 (1988). https://doi.org/10.1557/JMR.1988.0819

Download citation