Investigation on the valence of Cr ions in LiAlO2

M. Yamaga, J.P.R. Wells, M. Honda, T.P.J. Han, B. Henderson

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The angular dependence of the electron paramagnetic resonance (EPR) spectra of Cr:LiAlO2 does not fit Cr4+ with S=1, but rather Cr3+ with S ¼ 3 2: The energy level (740 cm1) of the first excited state estimated from the temperature dependence of the EPR line width is consistent with the energy separation between two groups of zero-phonon lines in the near-infrared luminescence observed at 10 K. The paramagnetic center observed by the EPR technique is the same as the optically active center. These results suggest the possibility that trivalent chromium ions substitute for trivalent aluminum ions in LiAlO2 with tetrahedral symmetry, without local charge compensators.
LanguageEnglish
Pages313-317
Number of pages4
JournalJournal of Luminescence
Volume108
DOIs
Publication statusPublished - Jun 2004

Fingerprint

Electron Spin Resonance Spectroscopy
Paramagnetic resonance
electron paramagnetic resonance
Ions
valence
Phonons
ions
compensators
Chromium
Luminescence
resonance lines
Excited states
Linewidth
Electron energy levels
chromium
energy levels
substitutes
luminescence
Infrared radiation
temperature dependence

Keywords

  • infrared
  • tunable laser
  • Cr3+
  • oxide crystals
  • LiAlO2
  • lasers
  • nanoscience

Cite this

Yamaga, M., Wells, J. P. R., Honda, M., Han, T. P. J., & Henderson, B. (2004). Investigation on the valence of Cr ions in LiAlO2. Journal of Luminescence, 108, 313-317. https://doi.org/10.1016/j.jlumin.2004.01.066
Yamaga, M. ; Wells, J.P.R. ; Honda, M. ; Han, T.P.J. ; Henderson, B. / Investigation on the valence of Cr ions in LiAlO2. In: Journal of Luminescence. 2004 ; Vol. 108. pp. 313-317.
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abstract = "The angular dependence of the electron paramagnetic resonance (EPR) spectra of Cr:LiAlO2 does not fit Cr4+ with S=1, but rather Cr3+ with S ¼ 3 2: The energy level (740 cm1) of the first excited state estimated from the temperature dependence of the EPR line width is consistent with the energy separation between two groups of zero-phonon lines in the near-infrared luminescence observed at 10 K. The paramagnetic center observed by the EPR technique is the same as the optically active center. These results suggest the possibility that trivalent chromium ions substitute for trivalent aluminum ions in LiAlO2 with tetrahedral symmetry, without local charge compensators.",
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Yamaga, M, Wells, JPR, Honda, M, Han, TPJ & Henderson, B 2004, 'Investigation on the valence of Cr ions in LiAlO2' Journal of Luminescence, vol. 108, pp. 313-317. https://doi.org/10.1016/j.jlumin.2004.01.066

Investigation on the valence of Cr ions in LiAlO2. / Yamaga, M.; Wells, J.P.R.; Honda, M.; Han, T.P.J.; Henderson, B.

In: Journal of Luminescence, Vol. 108, 06.2004, p. 313-317.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Investigation on the valence of Cr ions in LiAlO2

AU - Yamaga, M.

AU - Wells, J.P.R.

AU - Honda, M.

AU - Han, T.P.J.

AU - Henderson, B.

PY - 2004/6

Y1 - 2004/6

N2 - The angular dependence of the electron paramagnetic resonance (EPR) spectra of Cr:LiAlO2 does not fit Cr4+ with S=1, but rather Cr3+ with S ¼ 3 2: The energy level (740 cm1) of the first excited state estimated from the temperature dependence of the EPR line width is consistent with the energy separation between two groups of zero-phonon lines in the near-infrared luminescence observed at 10 K. The paramagnetic center observed by the EPR technique is the same as the optically active center. These results suggest the possibility that trivalent chromium ions substitute for trivalent aluminum ions in LiAlO2 with tetrahedral symmetry, without local charge compensators.

AB - The angular dependence of the electron paramagnetic resonance (EPR) spectra of Cr:LiAlO2 does not fit Cr4+ with S=1, but rather Cr3+ with S ¼ 3 2: The energy level (740 cm1) of the first excited state estimated from the temperature dependence of the EPR line width is consistent with the energy separation between two groups of zero-phonon lines in the near-infrared luminescence observed at 10 K. The paramagnetic center observed by the EPR technique is the same as the optically active center. These results suggest the possibility that trivalent chromium ions substitute for trivalent aluminum ions in LiAlO2 with tetrahedral symmetry, without local charge compensators.

KW - infrared

KW - tunable laser

KW - Cr3+

KW - oxide crystals

KW - LiAlO2

KW - lasers

KW - nanoscience

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M3 - Article

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SP - 313

EP - 317

JO - Journal of Luminescence

T2 - Journal of Luminescence

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Yamaga M, Wells JPR, Honda M, Han TPJ, Henderson B. Investigation on the valence of Cr ions in LiAlO2. Journal of Luminescence. 2004 Jun;108:313-317. https://doi.org/10.1016/j.jlumin.2004.01.066