Journal of Materials Science

, Volume 20, Issue 9, pp 3191–3200 | Cite as

Electrical and optical properties of single crystalline α-Al2O3 doped with nickel

  • John-Sea Chen
  • F. A. Kröger
Papers

Abstract

Nickel, substituting for aluminium in α-Al2O3 acts as an acceptor with a level ∼2.46 eV above the conduction band if a large polaron model applies, ≅ 2.57eV−H(μ h) above the band if a small polaron model applies. It is present as Ni3+ at high, and as Ni2+ at low, oxygen pressures, the concentration of Ni3+ being reduced to one-half of its high \(p_{o_2 } \) value at \(p_{o_2 } \)=1 Pa. Analysis of the data provides proof that the native defect compensating the charge of Ni2+ (=ni al ) is V O 2. , Al i 3. being a minority species; H F,Al−1/2H s=121 kJ mol−1.

Keywords

Oxygen Pressure Native Defect Minority Species Empirical Potential Polaron Model 

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Copyright information

© Chapman and Hall Ltd 1985

Authors and Affiliations

  • John-Sea Chen
    • 1
  • F. A. Kröger
    • 1
  1. 1.Department of Materials ScienceUniversity of Southern CaliforniaLos AngelesUSA

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