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dc.contributor.authorDexpert-Ghys, J.
dc.contributor.authorRibeiro, SJL
dc.contributor.authorDugat, P.
dc.contributor.authorAvignant, D.
dc.contributor.authorFaucher, M. D.
dc.identifier.citationSpectrochimica Acta Part A-molecular and Biomolecular Spectroscopy. Oxford: Pergamon-Elsevier B.V., v. 56, n. 3, p. 475-483, 2000.
dc.description.abstractAn investigation by optical spectroscopy of the Eu3 + and Er3 + active ions in the crystallized fluorozirconate matrix LaZr2F11 is presented. The D-5(1) --> F-7(0-5) emission lines of Eu3 + are used to extract the F-7(0-5) energy scheme and the observed extinctions permit the deduction of irreducible representations (IRREPS) associated with corresponding sub-levels in the D-2 symmetry. The crystal field analysis was carried out on a 387 x 387 basis set, comprising the F-7, D-5(1,2,3) F-5(1,2), (5)G(1,2,3) and P-3(1,2,3,4,5,6) terms of the Eu-3 (+) 4f(6) configuration. The deviation and rms are 6.8 and 7.9 cm (-1), respectively for 38 levels and ten parameters. The experimental crystal field parameters are in good agreement with the ab-initio ones. Moreover, the relative intensities of the D-5(0) --> F-7(2,3,4) emissions are well reproduced by an 'ab-initio' calculation, except for three lines. The Er3 + ions introduced in LaZr2F11, microcrystals also lie in an unique crystallographic site. A total of 31 energy levels were recorded and the crystal field analysis led to 6.6 and 7.8 cm (-1) for the deviation and rms, respectively, for nine variable parameters taken into account. The experimental CF parameters for Er3 + and Eu3 + are very similar, which seems to show that the host lattice contracts around the smaller Er3 + ion. The informations given by both Eu3 + and Eu3 + optical probes in LaZr2F11 are very consistent with the structure previously determined for the isotypic PrZr2F11 fluoride. (C) 2000 Elsevier B.V. B.V. All rights reserved.en
dc.publisherElsevier B.V.
dc.relation.ispartofSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
dc.sourceWeb of Science
dc.subjectoptical probept
dc.subjectcrystal fieldpt
dc.titleSpectroscopic studies of the Eu3+ and Er3+ ions in the fluorozirconate LaZr2F11 matrixen
dcterms.rightsHolderElsevier B.V.
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniv Blaise Pascal
dc.contributor.institutionEcole Cent Paris
dc.description.affiliationCNRS, CEMES, F-31055 Toulouse 4, France
dc.description.affiliationUNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.description.affiliationUniv Blaise Pascal, CNRS, Upres A 6002, Lab Mat Inorgan, F-63177 Aubiere, France
dc.description.affiliationEcole Cent Paris, Lab SPMS, UMR 8580, F-92295 Chatenay Malabry, France
dc.description.affiliationUnespUNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil
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