Electron spin resonance of Cr5+ in TeO2: Cr

A. Watterich, R. H. Bartram, G. J. Edwards, O. R. Gilliam, I. Földvári, R. Voszka

Research output: Contribution to journalArticle

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Abstract

A Cr5+ ion in a substitutional cation site is studied by ESR following a 1.5 MeV electron irradiation of Cr-doped paratellurite (α-TeO2) at room temperature. The radiation is presumed to generate Cr5+ by charge transfer from Cr3+ ions present in the as-grown crystal. The principal values of g and their eigenvectors are reported for the Cr5+ impurity ion. A comparison of this g tensor with those reported for nd1 ions in the more symmetric rutile-like crystal structures is made. Also, a comparison of the g values of Cr5+ in various host lattices is provided. Hyperfine interactions with the 53Cr isotope and with the 125Te isotopes in several neighboring cation sites are detected. However, only the A tensor for the largest 125Te hyperfine interaction could be determined completely because of the low Cr concentration. These findings permit the assignment of a possible model for the Cr5+ ion in paratellurite.

Original languageEnglish
Pages (from-to)249-253
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume48
Issue number3
DOIs
Publication statusPublished - 1987

Fingerprint

Paramagnetic resonance
electron paramagnetic resonance
Ions
ions
Isotopes
Tensors
Cations
isotopes
Positive ions
tensors
cations
Electron irradiation
electron irradiation
Eigenvalues and eigenfunctions
rutile
Charge transfer
low concentrations
eigenvectors
Crystal structure
charge transfer

Keywords

  • chromium-doped paratellurite (α-TeO:Cr)
  • Electron spin resonance
  • radiation effects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Electron spin resonance of Cr5+ in TeO2 : Cr. / Watterich, A.; Bartram, R. H.; Edwards, G. J.; Gilliam, O. R.; Földvári, I.; Voszka, R.

In: Journal of Physics and Chemistry of Solids, Vol. 48, No. 3, 1987, p. 249-253.

Research output: Contribution to journalArticle

Watterich, A. ; Bartram, R. H. ; Edwards, G. J. ; Gilliam, O. R. ; Földvári, I. ; Voszka, R. / Electron spin resonance of Cr5+ in TeO2 : Cr. In: Journal of Physics and Chemistry of Solids. 1987 ; Vol. 48, No. 3. pp. 249-253.
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abstract = "A Cr5+ ion in a substitutional cation site is studied by ESR following a 1.5 MeV electron irradiation of Cr-doped paratellurite (α-TeO2) at room temperature. The radiation is presumed to generate Cr5+ by charge transfer from Cr3+ ions present in the as-grown crystal. The principal values of g and their eigenvectors are reported for the Cr5+ impurity ion. A comparison of this g tensor with those reported for nd1 ions in the more symmetric rutile-like crystal structures is made. Also, a comparison of the g values of Cr5+ in various host lattices is provided. Hyperfine interactions with the 53Cr isotope and with the 125Te isotopes in several neighboring cation sites are detected. However, only the A tensor for the largest 125Te hyperfine interaction could be determined completely because of the low Cr concentration. These findings permit the assignment of a possible model for the Cr5+ ion in paratellurite.",
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AU - Watterich, A.

AU - Bartram, R. H.

AU - Edwards, G. J.

AU - Gilliam, O. R.

AU - Földvári, I.

AU - Voszka, R.

PY - 1987

Y1 - 1987

N2 - A Cr5+ ion in a substitutional cation site is studied by ESR following a 1.5 MeV electron irradiation of Cr-doped paratellurite (α-TeO2) at room temperature. The radiation is presumed to generate Cr5+ by charge transfer from Cr3+ ions present in the as-grown crystal. The principal values of g and their eigenvectors are reported for the Cr5+ impurity ion. A comparison of this g tensor with those reported for nd1 ions in the more symmetric rutile-like crystal structures is made. Also, a comparison of the g values of Cr5+ in various host lattices is provided. Hyperfine interactions with the 53Cr isotope and with the 125Te isotopes in several neighboring cation sites are detected. However, only the A tensor for the largest 125Te hyperfine interaction could be determined completely because of the low Cr concentration. These findings permit the assignment of a possible model for the Cr5+ ion in paratellurite.

AB - A Cr5+ ion in a substitutional cation site is studied by ESR following a 1.5 MeV electron irradiation of Cr-doped paratellurite (α-TeO2) at room temperature. The radiation is presumed to generate Cr5+ by charge transfer from Cr3+ ions present in the as-grown crystal. The principal values of g and their eigenvectors are reported for the Cr5+ impurity ion. A comparison of this g tensor with those reported for nd1 ions in the more symmetric rutile-like crystal structures is made. Also, a comparison of the g values of Cr5+ in various host lattices is provided. Hyperfine interactions with the 53Cr isotope and with the 125Te isotopes in several neighboring cation sites are detected. However, only the A tensor for the largest 125Te hyperfine interaction could be determined completely because of the low Cr concentration. These findings permit the assignment of a possible model for the Cr5+ ion in paratellurite.

KW - chromium-doped paratellurite (α-TeO:Cr)

KW - Electron spin resonance

KW - radiation effects

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