Advertisement

Journal of Materials Science

, Volume 27, Issue 23, pp 6440–6446 | Cite as

Valency of copper in 123 oxides

  • N. S. Raman
  • B. Viswanathan
  • T. K. Varadarajan
Papers

Abstract

The valency of copper in freshly prepared as well asin situ high-temperature oxygen-treated 123 oxides was analysed by X-ray photoelectron spectroscopy. The results suggest the presence of Cu2+ and Cu3+ along with Cu+. This observation is supported by cyclic voltammograms of 123 oxides recorded in a formamide medium. The valence band of 1 23 oxides was probed using X-ray (MgKα) and ultraviolet (He-I) sources. It was observed that the Cu-O hybridized orbital in YBa2Cu3O7−x responsible for conduction decreases with time in an ultrahigh vacuum and increases with oxygen treatment temperature.

Keywords

Oxide Oxygen Polymer Copper Spectroscopy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    R. J. Cava, B. Battlog, C. H. Chen, E. A. Rietmann, S. M. Zahurak andD. Werder,Nature 329 (1987) 423.CrossRefGoogle Scholar
  2. 2.
    P. K. Gallagher, H. M. O'bryan, S. A. Sunshine andD. W. Murphy,Mater. Res. Bull. 22 (1987) 995.CrossRefGoogle Scholar
  3. 3.
    “Chemical and Structural Aspects of High Temperature Superconductors”, edited by C. N. R. Rao (World Scientific, Singapore, 1988).Google Scholar
  4. 4.
    D. C. Harris andT. A. Hewston,J. Solid State Chem. 69 (1987) 182.CrossRefGoogle Scholar
  5. 5.
    G. Kawamura andM. Hiratani,J. Electrochem. Soc. (1987) 3211.Google Scholar
  6. 6.
    D. C. Parasher, J. Rai, P. K. Gupta, R. C. Sharma andK. Lal,Jpn. J. Appl. Phys. 27 (1988) L2304.CrossRefGoogle Scholar
  7. 7.
    S. X. Dou, H. K. Liu, A. J. Bourdillon, N. Sarrides, J. P. Zhou andS. S. Sorrel,Solid State Commun. 68 (1988) 47.CrossRefGoogle Scholar
  8. 8.
    P. Steiner, V. Kinsinger, I. Sander, B. Sieguart, S. Huffner, C. Politis, R. Hoppe andH. P. Muller,Z. Phys. B 67 (1987) 497.CrossRefGoogle Scholar
  9. 9.
    N. T. Liang, K. H. Li, Y. C. Chou, M. F. Tai andT. T. Chen,Solid State Commun. 64 (1987) 761.CrossRefGoogle Scholar
  10. 10.
    N. Mori, Y. Takano andH. Ozaki,Jpn. J. Appl. Phys. Suppl. 26–3 (1987) BJ21.Google Scholar
  11. 11.
    D. D. Sharma andC. N. R. Rao,Solid State Commun. 65 (1988) 47.CrossRefGoogle Scholar
  12. 12.
    R. Schlogl, H. Eickenbusch, W. Paulus andR. Schollhorn,Mater. Res. Bull. 24 (1989) 181.CrossRefGoogle Scholar
  13. 13.
    E. Sacher, J. E. Klemberg-Sapieha, A. Cambron, A. Okaniewski andA. Yelon,J. Elect. Spect. Relat. Phenom. 48 (1989) C7.CrossRefGoogle Scholar
  14. 14.
    A. Bianconi, A. Congiu Castellano, M. De Santis andR. Rudolf,Solid State Commun. 63 (1987) 1009.CrossRefGoogle Scholar
  15. 15.
    F. Bandelet, G. Collin, E. Dartuge, A. Fontaine, J. P. Kappler, G. Krill, J. P. Itie, J. Jegoudez, M. Maurer, Ph. Monod, A. Revcolevschi, H. Tolentino, G. Tourillon andM. Verdaguer,Z. Phys. B69 (1989) 149.Google Scholar
  16. 16.
    E. Z. Kurmauv andL. D. Finkelstein,Int. J. Mod. Phys. B3 (1989) 973.CrossRefGoogle Scholar
  17. 17.
    V. J. Emery,Phys. Rev. Lett. 58 (1987) 2794.CrossRefGoogle Scholar
  18. 18.
    J. B. Goodenough,Mater. Res. Bull. 23 (1983) 401.CrossRefGoogle Scholar
  19. 19.
    M. G. Ramsey andF. P. Netzer,Mater. Sci. Engng B2 (1989) 269.CrossRefGoogle Scholar
  20. 20.
    J. H. Weaver, H. M. Meyer III, T. J. Wagener, D. M. Hill andY. Gao,Phys. Rev. B38 (1988) 4668.CrossRefGoogle Scholar
  21. 21.
    J. Mingrong, H. Zhenghui, W. Jianxan, Z. Han, P. Gupgiang, C. Zhuyao, Q. Yitai, Z. Yong, H. Liping, X. Jiansen andZ. Qirui,Solid State Commun. 63 (1987) 511.CrossRefGoogle Scholar
  22. 22.
    W. R. Flavell andR. G. Edgel,Supercond. Sci. Technol. 1 (1988) 118.CrossRefGoogle Scholar
  23. 23.
    T. Hashesemi, F. Golestani-Fard, Z. T. Aldhhan andC. A. Hogarth,Spectrochim. Acta 43B (1988) 951.CrossRefGoogle Scholar
  24. 24.
    S. Myhra, J. C. Riviere, A. M. Stewart andP. C. Healy,Z. Phys. B. Condensed Matter 72 (1988) 413.CrossRefGoogle Scholar
  25. 25.
    C. N. R. Rao, P. Ganguly, J. Gopalakrishnan andD. D. Sarma,Mater. Res. Bull. 22 (1987) 1159.CrossRefGoogle Scholar
  26. 26.
    J. B. Goodenough, A. Manthiram, Y. Dai andA. Campion,Supercond. Sci. Technol. 1 (1988) 187.CrossRefGoogle Scholar
  27. 27.
    W. E. Pickett,Rev. Mod. Phys. 61 (1989) 433.CrossRefGoogle Scholar
  28. 28.
    P. Steiner, S. Huffner, A. Jungmann, V. Kinsinger andI. Sander,Z. Phys. B. Condensed Matter 74 (1989) 173.CrossRefGoogle Scholar
  29. 29.
    J. C. Fuggle, P. J. W. Weijs, R. Schoorl, G. A. Sawatzky, J. Fink andN. Nucker, P. J. Durbam andW. M. Temmerman,Phys. Rev. B37 (1988) 123.CrossRefGoogle Scholar
  30. 30.
    R. J. Cava, B. Battlog, R. B. Van Dover, D. W. Murphy, S. Sunshine, T. Siegrist, J. P. Remeika, S. Zahrauk andG. P. Espinosa,Phys. Rev. Lett. 56 (1987) 1676.CrossRefGoogle Scholar
  31. 31.
    W. Klemm, G. Wehremeyer andH. Bade,Z. Electrochem. 63 (1959) 56.Google Scholar
  32. 32.
    K. Hesterman andR. Hoppe,Z. Anorg. Allgem. Chem. 367 (1978) 261.CrossRefGoogle Scholar
  33. 33.
    S. Chandra andK. L. Yadava,talenta 15 (1968) 349.CrossRefGoogle Scholar
  34. 34.
    K. T. Park, K. Terakura, T. Oguchi, A. Yanae andM. Ikeda,J. Phys. Soc. Jpn 57 (1988) 3445.CrossRefGoogle Scholar
  35. 35.
    R. G. Egdell andW. R. Flavell,Z. Phys. B. Condensed Matter 74 (1989) 279.CrossRefGoogle Scholar
  36. 36.
    F. P. Bossu, K. L. Chellappa andD. W. Margerum,J. Amer. Chem. Soc. 99 (1977) 2195.CrossRefGoogle Scholar
  37. 37.
    M. P. Youngblood andD. W. Margerum,Inorg. Chem. 19 (1980) 3068.CrossRefGoogle Scholar
  38. 38.
    P. R. Sharp andA. J. Bard,ibid. 22 (1983) 3462.CrossRefGoogle Scholar
  39. 39.
    P. S. Zacharias andA. Ramachandran,Polyhedron 4 (1985) 1013.CrossRefGoogle Scholar
  40. 40.
    N. M. Latimer, “The Oxidation States of the Elements and their Potentials in Aqueous Solutions” (Prentice Hall, New York, 1964) p. 188.Google Scholar
  41. 41.
    L. Q. Chen, Y. Z. Huang, L. Z. Xin, X. J. Huang andT. E. Hul,Bull. Electrochem. 5 (1989) 483.Google Scholar
  42. 42.
    P. Salvador, J. L. G. Fierro, J. Amador, C. Cascales andI. Rasines,J. Solid State Chem. 81 (1989) 240.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • N. S. Raman
    • 1
  • B. Viswanathan
    • 1
  • T. K. Varadarajan
    • 1
  1. 1.Department of ChemistryIndian Institute of TechnologyMadrasIndia

Personalised recommendations