Paper Title:
Investigations of the axial displacements of Co2+and Ni3+ in Al2O3
  Abstract

The axial displacements for Co2+ and Ni3+ in Al2O3 are theoretically investigated starting from the perturbation formulas of the EPR parameters for a 3d7 ion with high spin (S=3/2) and low spin (S=1/2) in trigonal symmetry, respectively. Based upon these studies, the Co2+ is found to shift towards the center of the oxygen octahedron by an amount ZCo (≈ 0.03 Å) along the C3 axis, while the Ni3+ may suffer another axial displacement ZNi (≈ −0.38 Å) away from the center of the octahedron. The calculated EPR parameters based upon the above axial displacements show good agreement with the observed values. The differences in the EPR parameters and the axial displacements for the two 3d7 ions are discussed.

  Info
Periodical
Defect and Diffusion Forum (Volumes 261-262)
Edited by
David J. Fisher
Pages
93-102
DOI
10.4028/www.scientific.net/DDF.261-262.93
Citation
S. Y. Wu, Q. Fu, G. D. Lu, J. S. Yao, "Investigations of the axial displacements of Co2+and Ni3+ in Al2O3", Defect and Diffusion Forum, Vols. 261-262, pp. 93-102, 2007
Online since
January 2007
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$32.00
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