Point Defect Structure of Chromium (III) Oxide

  • Ming-Yih Su
  • George Simkovich
Part of the NATO ASI Series book series (ASIC, volume 276)


Based upon studies of the electrical conductivity and Seebeck coefficient of TiO2- and MgO-doped Cr2O3, the point defect structure of Cr2O3 was determined. It is found that the defect and transport properties in Cr2O3 are complicated. At high temperatures, different defects may be present depending upon the oxygen partial pressure. In general, at high PO2, Cr2O3 is a p-type semiconductor with electron holes and chromium vacancies as the dominant defects; at intermediate PO2, it behaves as an intrinsic semiconductor with electrons and electron holes dominant; and at low PO2, near the Cr/Cr2O3 equilibrium oxygen pressure, it changes to an n-type semiconductor with electrons and chromium interstitials dominant. The equilibrium constants associated with the formation of different defects are also obtained.


Defect Structure Oxygen Partial Pressure Seebeck Coefficient Dopant Content Electron Hole 
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  1. 1.
    P. Kofstad, pp. 203–208 in Nonstoichiometry, Diffusion, and Electrical Conductivity in Binary Metal Oxides. Wiley-Interscience, New York, 1972.Google Scholar
  2. 2.
    W. C. Hagel and A. V. Seybolt, “Cation Diffusion in Cr2O3,” J. Electrochem. Soc, 108 [12] 1146–52 (1961).CrossRefGoogle Scholar
  3. 3.
    L. C. Walters and R. E. Grace, “Self-Diffusion of 51Cr in Single Crystals of Cr2O3,” J. Appl. Phys., 36 [7] 2331–32 (1965).CrossRefGoogle Scholar
  4. 4.
    K. Hoshino and N. L. Peterson, “Cation Self-Diffusion in Cr2O3,” J. Am. Ceram. Soc, 66 [11] C-202–C-203 (1983).CrossRefGoogle Scholar
  5. 5.
    C. Greskovich, “Deviation from Stoichiometry in Cr2O3 at High Oxygen Partial Pressures,” J. Am. Ceram. Soc, 67 [6] C111–C112 (1984).CrossRefGoogle Scholar
  6. 6.
    P. Kofstad and K. P. Lillerud, “On High Temperature Oxidation of Chromium, II. Properties of Cr203 and The Oxidation Mechanism of Chromium,” J. Electrochem, Soc, 127 [11] 2410–19 (1980).CrossRefGoogle Scholar
  7. 7.
    H. Hindom and D. P. Whittle, “Evidence for the Growth Mechanism of Cr2O3 at Low Oxygen Potentials,” J. Electrochem. Soc, 130 [7] 1519–23 (1983).CrossRefGoogle Scholar
  8. 8.
    E. W. A. Young, P. C. M. Stiphout, and J. H. W. de Wit, “N-type Behavior of Chromium(III) Oxide,” J. Electrochem. Soc., 132 [4] 884–86 (1985).CrossRefGoogle Scholar
  9. 9.
    E. W. A. Young, J. H. Gerretsen, and J. H. W. de Wit, “The Oxygen Partial Pressure Dependence of the Defect Structure of Chromium (III) Oxide,”” J. Electrochem. Soc, 134 [9] 2275–60 (1987).CrossRefGoogle Scholar
  10. 10.
    T. Matsui and K. Naito, “Existence of Hypostoichiometric Chromium Sesquioxide at Low Oxygen Partial Pressures”, J. Nuc. Mat., 136, 78–82 (1985).CrossRefGoogle Scholar
  11. 11.
    A. Atkinson and R. I. Taylor, “Diffusion of 51Cr Tracer in Cr2O3 and the Growth of Cr2O3 films,” pp.285–95 in Transport in Nonstoichiometric Compounds, Edited by G. Simkovich and V. S. Stubican, Plenum, New York, 1985.Google Scholar
  12. 12.
    F. A. Kroger, “Defects and Transport in SiO2, Al2O3, Cr2O3,” pp. 89–100, High Temperature Corrosion, Proc NACE Conf., San Diego, Ca., March 1981.Google Scholar
  13. 13.
    F. G. Hicks, D. R. Holmes and D. B. Meadowcroft, “Defect Structure and Transport Properties of Oxide Solid Solutions Containing Cr2O3,” pp.379–84 in The 4th International Conference of Corrosion, 1969.Google Scholar
  14. 14.
    D. B. Meadowcroft and F. G. Hicks, “Electrical Conduction Processes and Defect Structure of Chromium Oxide,” Proc. Br. Ceram. Soc, 23, 33–41 (1972).Google Scholar
  15. 15.
    K. A. Hay, F. G. Hicks, and D. R. Holmes, “The Transport Porperties and Defect Structure of the Oxide (Fe, Cr)2O3 Formed on Fe-Cr Alloys,” D. R. Werkst. Korros., 21, 917–24 (1970).CrossRefGoogle Scholar
  16. 16.
    W. C. Hagel, “Eletrical Conductivity of Li-Substituted Cr2O3,” J. Appl. Phys., 36 [8] 2586–87 (1965).CrossRefGoogle Scholar
  17. 17.
    R. F. Huang, A. K. Agarwal and H. U. Anderson, “Oxygen Activity Dependence of the Electrical Conductivity of Li-Doped Cr2O3,” J. Am. Ceram. Soc, 67 [2] 146–50 (1984).CrossRefGoogle Scholar
  18. 18.
    H. Nagai, T. Fujikawa and K. Shoji, “Electrical Conductivity of Cr2O3 Doped with La2O3,Y2O3 and NiO,” Trans. Japan Inst. Metals, 24 [8] 581–88 (1983).Google Scholar
  19. 19.
    J. S. Park and H. G. Kim, “Electrical Conductivity and Defect Models of MgO Doped Cr2O3,” J. Am. Ceram. 71 [3] 173–76 (1988).CrossRefGoogle Scholar
  20. 20.
    M.-Y. Su, H.-Y. Chang and G. Simkovich, “Diffusion in Cr2O3 Via Initial Sintering Experiments,” pp.385–95 in Transport in Nonstoichiometric Compounds, Edited by G. Simkovich and V. S. Stubican, Plenum, New York, 1985.Google Scholar
  21. 21.
    M. -Y. Su, “Point Defect Structure of Chromium Sesquioxide,” Ph. D. thesis, The Pennsylvania State University, August, 1987.Google Scholar
  22. 22.
    J. H. Becker and H. P. R. Frederikse, “Electrical Properties of Nonstoichiometric Semiconductors,” J. Appl. Phys., 33 [1] 447–53 (1962).CrossRefGoogle Scholar
  23. 23.
    P.J. Lawrence, S. C. Parker, and P.W. Tasker, “Computer Modelling of the Defect Properties of Chromium Oxide, Cr2O3-X,” pp. 247–56, Advances in Ceramics, vol. 23; Nonstoichiometric Compounds, Edited by C. R. A. Catlow and W. C. Mackrodt, Am. Ceram. Soc., Inc., 1987.Google Scholar
  24. 24.
    F. Gesmundo and F. Viani, “Application of Wagner’s Theory to the Parabolic Growth of Oxides Containing Different Kinds of Defects. I. Pure Oxides,” J. Electrochem. Soc, 128 [2] 460–69 (1981).CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Ming-Yih Su
    • 1
  • George Simkovich
    • 1
  1. 1.The Metals Science and Engineering Program, Materials Science and Engineering DepartmentThe Pennsylvania State UniversityUniversity ParkUSA

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