Local order around rare earth ions during the devitrification of oxyfluoride glasses

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorSilva, Mauricio A. P.
dc.creatorDantelle, Geraldine
dc.creatorMortier, Michel
dc.creatorMonteil, Andre
dc.creatorRibeiro, Sidney José Lima
dc.creatorMessaddeq, Younes
dc.creatorBriois, Valerie
dc.creatorPoulain, Marcel
dc.date2014-05-20T14:20:31Z
dc.date2016-10-25T17:41:40Z
dc.date2014-05-20T14:20:31Z
dc.date2016-10-25T17:41:40Z
dc.date2008-06-28
dc.date.accessioned2017-04-05T22:34:26Z
dc.date.available2017-04-05T22:34:26Z
dc.identifierJournal of Chemical Physics. Melville: Amer Inst Physics, v. 128, n. 24, p. 6, 2008.
dc.identifier0021-9606
dc.identifierhttp://hdl.handle.net/11449/26165
dc.identifierhttp://acervodigital.unesp.br/handle/11449/26165
dc.identifier10.1063/1.2943672
dc.identifierWOS:000257284000051
dc.identifierWOS000257284000051.pdf
dc.identifierhttp://dx.doi.org/10.1063/1.2943672
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/870967
dc.descriptionErbium L-3-edge extended x-ray absorption fine structure (EXAFS) measurements were performed on rare earth doped fluorosilicate and fluoroborate glasses and glass ceramics. The well known nucleating effects of erbium ions for the crystallization of cubic lead fluoride (based on x-ray diffraction measurements) and the fact that the rare earth ions are present in the crystalline phase (as indicated by Er3+ emission spectra) seem in contradiction with the present EXAFS analysis, which indicates a lack of medium range structural ordering around the Er3+ ions and suggests that the lead fluoride crystallization does not occur in the nearest neighbor distance of the rare earth ion. Molecular dynamics simulations of the devitrification process of a lead fluoride glass doped with Er3+ ions were performed, and results indicate that Er3+ ions lower the devitrification temperature of PbF2, in good agreement with the experimental results. The genuine role of Er3+ ions in the devitrification process of PbF2 has been investigated. Although Er3+ ions could indeed act as seeds for crystallization, as experiments suggest, molecular dynamics simulation results corroborate the experimental EXAFS observation that the devitrification does not occur at its nearest neighbor distance. (c) 2008 American Institute of Physics.
dc.languageeng
dc.publisherAmerican Institute of Physics (AIP)
dc.relationJournal of Chemical Physics
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.titleLocal order around rare earth ions during the devitrification of oxyfluoride glasses
dc.typeOtro


Este ítem pertenece a la siguiente institución