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 - 2002

Fingerprint

Paramagnetic resonance
Electron irradiation
Electrons
Cations
Thermodynamic stability
electrons
Lighting
Positive ions
Irradiation
Single crystals
Annealing
electron paramagnetic resonance
Temperature
electron irradiation
thermal stability
illumination
interactions
cations
irradiation
annealing

Keywords

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

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Radiation
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Discovery of a self-trapped-electron center in α-TeO2. / Kappers, L. A.; Gilliam, O. R.; Bartram, R. H.; Watterich, A.; Földvári, I.

In: Radiation Effects and Defects in Solids, Vol. 157, No. 6-12, 2002, p. 671-676.

Research output: Contribution to journalArticle

Kappers, L. A. ; Gilliam, O. R. ; Bartram, R. H. ; Watterich, A. ; Földvári, I. / Discovery of a self-trapped-electron center in α-TeO2. In: Radiation Effects and Defects in Solids. 2002 ; Vol. 157, No. 6-12. pp. 671-676.
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AU - Földvári, I.

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