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In and Cd as defect traps in titanium dioxide

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Abstract

We present a study of TiO2 single crystals from the point of view of the dopant atom that simultaneously behaves as the probing element. We used gamma-gamma time dependent perturbed angular correlations working with selected tracer elements (111In/ 111Cd, 111mCd/ 111Cd) together to investigate the different behavior of Cd and In dopants, particularly their interaction with point defects in the TiO2 lattice. Results show that the hyperfine interactions observed at 111Cd from 111In or 111mCd decay are quite different. 111In/ 111Cd results show a single site fraction characterized by a quadrupole frequency with asymmetry parameter similar to those observed for the same probe nuclei in bulk TiO2 oxides. Results for 111mCd/ 111Cd reveal two site fractions, one characterized by the same hyperfine parameters to those measured in bulk TiO2 and another fraction characterized by a quadrupole frequency and asymmetry parameters with higher values, as observed in thin TiO2 films and correlated with point defects. The results are discussed emphasizing the differences for Cd and In as defect traps on TiO2.

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Authors and Affiliations

  1. European Organization for Nuclear Research (CERN), CH-1211, Geneva, Switzerland

    Juliana Schell, João Guilherme Martins Correia, Karl Johnston & ISOLDE collaboration

  2. Institute for Materials Science and Center for Nanointegration, Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany

    Juliana Schell & Doru C. Lupascu

  3. C2TN, Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal

    João Guilherme Martins Correia

  4. Instituto de Pesquisas Energéticas e Nucleares, Universidade de São Paulo, São Paulo, Brazil

    Artur Wilson Carbonari & Ibere S. Ribeiro Jr.

  5. Experimentalphysik, Universität des Saarlandes, Saarlandes, Germany

    Manfred Deicher

  6. Instituto de Física dos Materiais da Universidade do Porto, Porto, Portugal

    Marcelo Baptista Barbosa

  7. Escola Politécnica, Universidade de São Paulo, São Paulo, Brazil

    Ronaldo Domingues Mansano

Authors
  1. Juliana Schell
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  2. Doru C. Lupascu
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  3. João Guilherme Martins Correia
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  4. Artur Wilson Carbonari
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  5. Manfred Deicher
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  6. Marcelo Baptista Barbosa
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  7. Ronaldo Domingues Mansano
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  8. Karl Johnston
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  9. Ibere S. Ribeiro Jr.
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  10. ISOLDE collaboration
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Corresponding author

Correspondence to Juliana Schell.

Additional information

This article is part of the Topical Collection on Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2016), Leuven, Belgium, 3-8 July 2016 Edited by Kristiaan Temst, Stefaan Cottenier, Lino M. C. Pereira and André Vantomme

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Schell, J., Lupascu, D.C., Martins Correia, J.G. et al. In and Cd as defect traps in titanium dioxide. Hyperfine Interact 238, 2 (2017). https://doi.org/10.1007/s10751-016-1373-7

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  • DOI: https://doi.org/10.1007/s10751-016-1373-7

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