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DOI: 10.1039/A707092F (Paper) Reference Section for: J. Mater. Chem., 1998, 8, 1095-1098

Surface and bulk phases in substituted cobalt oxide spinels

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David Pyke, Kajal K. Mallick, Richard Reynolds and Ashok K. Bhattacharya

Abstract

Samples of cobalt oxide spinel doped with a range of cations (Li, Ni, Zn, Cu, Al, Ga, Mn, Ti, Sn, Ge) have been prepared and examined by X-ray diffraction and X-ray photoelectron spectroscopy. Surface enrichment in the dopant species is frequently observed. Determination of the ratio of the two cobalt oxidation states in the surface layers is found to be useful in distinguishing between solid solution behaviour and the nucleation of surface phases. This ratio may also be helpful in characterising the preferred occupancy of octahedral and tetrahedral sites in the near surface regions.

References

  1. D. Klissurski and E. Uzunova, J. Mater. Sci., 1992, 285.
  2. M. Inagaki and S. Naka, J. Solid State Chem., 1975, 13, 365 CAS.
  3. F. Driessens, G. Rieck and H. Coenen, J. Inorg. Nucl. Chem., 1968, 30, 747 CAS.
  4. R. Bontchev, PhD thesis, Sofia, 1990.
  5. J. P. Jacobs, A. Maltha, J. G. H. Reintjes, V. Ponek and H. H. Brongersma, J. Catal., 1994, 147, 294 CrossRef CAS.
  6. C. Laberty, M. Verelst, P. Lecante, P. Alphonse, A. Mosset and A. Rousset, J. Solid State Chem., 1997, 129, 271 CrossRef CAS.
  7. P. Poix, Soc. Chim., 1965, 5, 1085 Search PubMed.
  8. P. Poix, CR Acad. Sci., 1969, 268, 1139 Search PubMed.
  9. A. Navrotsky and O. J. Kleppa, J. Inorg Chem., 1967, 29, 2701 Search PubMed.
  10. J. Nowotny, in Science of Ceramic Interfaces, ed. J. Nowotny, Elsevier, B. V., Amsterdam, 1991, p. 79 Search PubMed.
  11. B. Boucher, R. Buhl, R. di Bella and M. Perrin, J. Phys. (Paris), 1970, 31, 113 Search PubMed.
  12. G. Blasse, Phillips Res. Rep., 1963, 18, 383 Search PubMed.
  13. O. Knop, K. I. G. Reid, Sutarno and Y. Nakagaura, Can. J. Chem., 1968, 46, 3463 CAS.
  14. J. A. K. Tareen, A. Malecki, J. P. Doumerc, J. C. Launay, P. Dordor, M. Pouchard and P. Hagenmuller, Mater. Res. Bull., 1984, 19, 989 CAS.
  15. P. D. Battle, A. K. Cheetham and J. B. Goodenough, Mater. Res. Bull., 1979, 14, 1013 CrossRef CAS.
  16. T. Andrushkevich, G. Boreskov, V. Popovskii, L. Pliasova, L. Karakchiev and A. Ostankovitch, Kinet. Katal., 1968, 9, 1244 Search PubMed.
  17. H. Baussart, M. Le Bras and J. M. Leroy, C.R. Acad. Sci. Paris, 1977, 284, C-735 Search PubMed.
  18. H. Mueller-Buschbaum and A. Tomaszewska, Z. Kristallogr., 1991, 196, 121 CAS.
  19. H. Ichimura and W. Komatsu, J. Chem. Soc. Jpn., 1972, 4, 690 Search PubMed.
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