Discovery of a self-trapped-electron center in α-TeO2

L. A. Kappers, O. R. Gilliam, R. H. Bartram, A. Watterich, I. Földvári

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Electron spin resonance (ESR) studies show that electron irradiation of an α-TeO2 single crystal followed by 330-nm UV illumination at ∼10K generates a new spin-1/2 paramagnetic center having C2 symmetry, like the Te lattice sites, that is attributed to a self-trapped charge on a Te. Identification is facilitated by a strong hyperfine interaction with 125Te at a central Te site and weaker 125Te superhyperfine interactions with three different equivalent pairs of neighboring Te cations. The irradiations also produce the diamagnetic VOx center and the paramagnetic VO· and VO centers. From measurements of concentration changes of the paramagnetic centers due to thermal annealing of the new center it is deduced that the self-trapped charge is a self-trapped electron. It is designated as a TeO2 center. This assignment is consistent with its low thermal stability since it anneals quickly at temperatures above 40 K. ESR characteristics of this new center are described.

Original languageEnglish
Pages (from-to)671-676
Number of pages6
JournalRadiation Effects and Defects in Solids
Volume157
Issue number6-12
DOIs
Publication statusPublished - Dec 1 2002

Keywords

  • Defect stability
  • ESRα-TeO crystal
  • Electron irradiation
  • Self-trapped electron
  • UV illumination

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Condensed Matter Physics

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