Microscopic observation of impurities in TiO2 using radioactive nuclear probes

M. Mihara, S. Kumashiro, H. Fujiwara, R. Matsumiya, K. Matsuta, Y. Nakashima, Y. N. Zheng, M. Ogura, T. Sumikama, T. Nagatomo, K. Minamisono, M. Fukuda, T. Izumikawa, T. Minamisono

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


The dynamical behavior of nitrogen impurity in TiO2 was examined microscopically by means of the β-NMR technique. Short-lived radioactive nucleus 12N(I=1, T1/2=11ms) was implanted into a single crystal of rutile TiO2 and its NMR was observed at 300-900 K through the β-ray detection. Spin-lattice relaxation due to a fluctuation of the nuclear quadrupole interaction induced by an atomic motion was observed for oxygen substitutional and interstitial lattice sites. The corresponding amplitude of the fluctuation for the substitutional site was found to be much smaller than the static quadrupole field. From this result and the deduced activation energy, we infer that a substitutional 12N atom remains in the site and the observed spin-lattice relaxation is attributed to the motion of some kind of defects. The possibility of interstitial nitrogen diffusion is also discussed.

Original languageEnglish
Pages (from-to)955-958
Number of pages4
JournalPhysica B: Condensed Matter
Issue number1
Publication statusPublished - 2006 Apr 1
EventProceedings of the 23rd International Conference on Defects in Semiconductors -
Duration: 2005 Jul 242005 Jul 29


  • Atomic jump
  • Implantation
  • TiO
  • β-NMR

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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