Radiation-induced intrinsic defects in TeO2

G. Corradi, A. Watterich, I. Foldvari, R. Voszka, J. R. Niklas, J. M. Spaeth, O. R. Gilliam, L. A. Kappers

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Abstract

In undoped paratellurite ( alpha -TeO2) electron-irradiated near room temperature, in addition to the VO. centre, two further intrinsic, strongly anisotropic radiation defects have been characterised using ESR and ENDOR spectroscopy. The first new centre is assumed to be an aggregate of two oxygen vacancies with a net positive charge and denoted as (VO)2.. According to this model the unpaired spin is mainly distributed along with a quasilinear Te-O-Te-O-Te chain with the vacancies in short-bond positions relative to the central tellurium. Based on apparent analogies a similar delocalisation is suggested for the V O. centre as well. For the second new centre the 'small peroxy radical' model originally proposed for SiO2 by Edwards and Fowler (1982) has been adapted, where an oxygen interstitial is trapped next to a lattice oxygen, the latter also maintaining its bonds to both Te neighbours (Te-O2-Te).

Original languageEnglish
Article number002
Pages (from-to)4325-4339
Number of pages15
JournalJournal of Physics: Condensed Matter
Volume2
Issue number19
DOIs
Publication statusPublished - Dec 1 1990

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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    Corradi, G., Watterich, A., Foldvari, I., Voszka, R., Niklas, J. R., Spaeth, J. M., Gilliam, O. R., & Kappers, L. A. (1990). Radiation-induced intrinsic defects in TeO2. Journal of Physics: Condensed Matter, 2(19), 4325-4339. [002]. https://doi.org/10.1088/0953-8984/2/19/002