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    • Theoretical studies of the g factors and local structure for Pt3+ in 𝛼-Al2O3

      Z H Zhang S Y Wu S X Zhang L L Li

      Research Articles Volume 78 Issue 3 March 2012 pp 475-482

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      https://www.ias.ac.in/article/fulltext/pram/078/03/0475-0482

    • Keywords

       

      Electron paramagnetic resonance (EPR); impurities and defects; Pt3+; 𝛼-Al2O3.

    • Abstract

       

      The anisotropic 𝑔 factors and local structure for the trigonal Pt3+ centre in 𝛼-Al2O3 are theoretically investigated from the perturbation formulas of the 𝑔 factors for a $5d^7$ ion in trigonal symmetry. The Pt3+ impurity is found to experience an outward displacement by about 0.18 Å away from the centre of the oxygen octahedron along the $C_3$-axis. The calculated g factors based on the above axial displacement show good agreement with the observed values. Importantly, the pending problem of $+3$ valence state of the doped Pt in 𝛼-Al2O3 is theoretically clarified, and the possibility of Pt+ ($5d^9$) is thus excluded in this work.

    • Author Affiliations

       

      Z H Zhang1 S Y Wu1 2 S X Zhang1 L L Li1

      1. Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China
      2. International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China

    • Dates

       
      Published
      March 2012
      Manuscript received
      26 August 2010
      Accepted
      8 November 2011

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