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À propos de : Laser-Excited Luminescence of Trivalent LanthanideImpurities and Local Structure in CeO2−ZrO2 MixedOxides        

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  • Laser-Excited Luminescence of Trivalent LanthanideImpurities and Local Structure in CeO2−ZrO2 MixedOxides
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  • Laser-excited Raman and luminescence spectroscopy of a series of ceria−zirconia mixed oxides has been used to identify the presence of trivalent lanthanide ions as unintentional impurities and to obtain structural information.
  • In this paper we report on the laser-excited Raman and luminescence spectroscopy of aseries of ceria−zirconia mixed oxides, containing trivalent lanthanide ions as unintentionalimpurities, using 488.0-, 514.5-, and 1064.0-nm excitation wavelengths. We assigned themain bands located at Stokes shifts higher than 800 cm-1 from the laser lines to f−f emissiontransitions of Pr3+, Nd3+, Ho3+, and Er3+ ions. These ions can also be used as spectral probesof the cation sites in the solid solutions as their transition intensities are found to bedependent on the local symmetry of the sites in which they are accommodated. f−f emissiontransitions have also been found to overlap the vibrational Raman bands for Stokes shiftslower than 800 cm-1 from the laser lines. To overcome possible ambiguities in the structuralinformation extracted from the Raman spectra, at least two laser excitation lines must beused.
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