57Fe Mössbauer study of epitaxial TiN thin film grown on MgO(100) by magnetron sputtering

Research output: Research - peer-reviewJournal article – Annual report year: 2019

  • Author: Qi, Benkun

    University of Iceland, Iceland

  • Author: Gunnlaugsson, H. P.

    University of Iceland, Iceland

  • Author: Mokhles Gerami, A.

    K.N. Toosi University of Technology, Iran, Islamic Republic of

  • Author: Gislason, H.P.

    University of Iceland, Iceland

  • Author: Olafsson, S.

    University of Iceland, Iceland

  • Author: Magnus, F.

    University of Iceland, Iceland

  • Author: Mølholt, Torben Esmann

    Radiation Physics, Center for Nuclear Technologies, Technical University of Denmark, Frederiksborgvej 399, 4000, Roskilde, Denmark

  • Author: Masenda, H.

    University of the Witwatersrand, South Africa

  • Author: Tarazaga Martín-Lueugo, A.

    Johannes Kepler University of Linz, Austria

  • Author: Bonanni, A.

    Johannes Kepler University of Linz, Austria

  • Author: Krastev, P.B.

    Bulgarian Academy of Sciences, Bulgaria

  • Author: Masondo, V.

    University of KwaZulu-Natal, South Africa

  • Author: Unzueta, I.

    Universidad del Pais Vasco, Spain

  • Author: Bharuth-Ram, K.

    University of KwaZulu-Natal, South Africa

  • Author: Johnston, K.

    ISOLDE Radioactive Ion Beam facility, Switzerland

  • Author: Naidoo, Dhamari

    University of the Witwatersrand, South Africa

  • Author: Schell, J.

    ISOLDE Radioactive Ion Beam facility, Switzerland

  • Author: Schaaf, P.

    Ilmenau University of Techology, Germany

View graph of relations

The properties and performance of TiN thin films are closely related to the concentration and mobility of lattice defects in the thin film structures of TiN. This makes a local atomic scale study of TiN thin films an ever-growing demand. Emission 57Fe Mössbauer spectroscopy (eMS) is a powerful tool in this regard, which we apply here to study an ultrathin TiN film epitaxially grown on MgO (100). With the help of theoretical calculations, our results show that most implanted Fe ions adopt a 2+ valence state and locate at the Ti sublattice in the bulk-like single crystalline grains, with the rest Fe residing at the grain boundaries as interstitials. A small percentage of nitrogen point defects (vacancy VN and interstitial NI) are observed in the bulk-like crystalline grains. A temperature-dependent, interstitial NI mediated site-exchange between NI and VN inside the crystal grain are deduced via a N2 dimmer like diffusion of NI through the crystal grains in the temperature range of 540 - 620 K. This is interesting in the perspective of exploring the catalytic property of TiN nanostructures. The titanium vacancy (VTi) is only detected at the grain boundaries. Annealing up to 813 K, both the VN and NI are annihilated in the crystalline grains and the VTi is fully recovered with healing of the grain boundaries. However, no evidence of ferromagnetism due to dilute implantation of 57Mn/57Fe and or structural defects in the film is obtained. This suggests that the so far reported dilute magnetism and defect-induced ferromagnetism in TiN nanostructures requires a further systematic investigation.
Original languageEnglish
JournalApplied Surface Science
Volume464
Pages (from-to)682-691
ISSN0169-4332
DOIs
StatePublished - 2019
CitationsWeb of Science® Times Cited: 0

    Research areas

  • Mössbauer spectroscopy, Epitaxial thin film, Defects
Download as:
Download as PDF
Select render style:
APAAuthorCBE/CSEHarvardMLAStandardVancouverShortLong
PDF
Download as HTML
Select render style:
APAAuthorCBE/CSEHarvardMLAStandardVancouverShortLong
HTML
Download as Word
Select render style:
APAAuthorCBE/CSEHarvardMLAStandardVancouverShortLong
Word

ID: 153520745