Glen A. Slack, Stephen L. Dole, Veneta Tsoukala, and George S. Nolas, "Optical absorption spectrum of trivalent cerium in Y2O3, Ba2GdTaO6, ThO2, and related compounds," J. Opt. Soc. Am. B 11, 961-974 (1994)
The optical absorption coefficient at room temperature has been measured for cerium-doped Y2O3 and Y1.4Gd0.6O3 samples from 1500 to 45000 wave numbers. Diffuse reflectivity has been measured on cerium-doped powders of Y2O3, Lu2O3, Sc2O3, Ba2GdTaO6, and ThO2 over the same range. A number of 4f − 4f and 4f − 5d transitions of trivalent Ce have been seen, and some experimental values for their oscillator strengths have been determined. A tentative assignment of particular transitions to either C2 or C3i sites in the Y2O3 structure has been made. Some of the transitions have also been seen by use of Raman scattering. Several phonon replicas of the 4f − 4f transitions have been identified. The charge-transfer band of tetravalent cerium in Y1.4Gd0.6O3 has been identified.
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In Y2O3 the 368-cm−1 peak may be a combination of phonons at 346 and 390 cm−1.
R1 is a replica of the transition to the first 2F7/2 level of Ce3+ in a C2 site;
is a replica of the transition to the first 2F7/2 level of Ce3+ in a C3i site.
Table 5
Visible and Ultraviolet Absorption Bands of Ce3+ from Transmission or Diffuse-Reflection Spectra
Weak shoulder.
For Ba2GdTaO6 the Ce3+ atoms are in slightly distorted octahedral sites approximating a C3i site. The
=19 200 cm−1 band is strong and has a half-width W = 4200 cm−1.
Ref. 4.
Possible Ce3+ absorption bands above 30000 cm−1 are obscured by intrinsic crystal absorptions.
Table 6
Band Parameters for Sample YGB for Transitions from the Ground State
In Y2O3 the 368-cm−1 peak may be a combination of phonons at 346 and 390 cm−1.
R1 is a replica of the transition to the first 2F7/2 level of Ce3+ in a C2 site;
is a replica of the transition to the first 2F7/2 level of Ce3+ in a C3i site.
Table 5
Visible and Ultraviolet Absorption Bands of Ce3+ from Transmission or Diffuse-Reflection Spectra
Weak shoulder.
For Ba2GdTaO6 the Ce3+ atoms are in slightly distorted octahedral sites approximating a C3i site. The
=19 200 cm−1 band is strong and has a half-width W = 4200 cm−1.
Ref. 4.
Possible Ce3+ absorption bands above 30000 cm−1 are obscured by intrinsic crystal absorptions.
Table 6
Band Parameters for Sample YGB for Transitions from the Ground State