Exafs Investigation Of Local Structure Of Er3+ And Yb 3+ In Low-silica Calcium Aluminate Glasses

dc.creatorSampaio J.A.
dc.creatorGama S.
dc.date2004
dc.date2015-06-26T14:23:38Z
dc.date2015-11-26T14:12:12Z
dc.date2015-06-26T14:23:38Z
dc.date2015-11-26T14:12:12Z
dc.date.accessioned2018-03-28T21:12:48Z
dc.date.available2018-03-28T21:12:48Z
dc.identifier
dc.identifierPhysical Review B - Condensed Matter And Materials Physics. , v. 69, n. 10, p. 1042031 - 1042037, 2004.
dc.identifier1631829
dc.identifier
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-2142657895&partnerID=40&md5=1333c0c1b4a6b45fe4a12f297a50a6da
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/94218
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/94218
dc.identifier2-s2.0-2142657895
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1241933
dc.descriptionErbium and ytterbium environments in low-silica calcium aluminate glasses, with nominal composition 58 CaO, 27.1-x Al2O3, 6.9 MgO, 8 SiO2, xcEr2O3, OrYb2O3, 0.2≤x=≤1.5 (mol%), were investigated using x-ray-absorption fine-structure spectroscopy (EXAFS) on the Er and Yb LIII edge. The average Er-O bond separation was found to vary only slightly between 2.24 and 2.21 Å and the Yb-O bond between 2.20 and 2.18 Å. The first-shell coordination number decreased as the rare-earth oxide replaced Al2O3. For Er2O3-doped samples this decrease was about 28%, from 6.5 to 4.7 atoms, whereas for Yb2O3-doped ones it was about 14%, from 6.4 to 5.5 atoms. The decrease in the coordination number is attributed to the difficulty of rare-earth atoms to coordinate a larger number of the nonbridging oxygens that appear as the CaO/Al2O3 ratio decreases. The Debye-Waller factor 2σ2 varied from 0.026 to 0.012 Å2.
dc.description69
dc.description10
dc.description1042031
dc.description1042037
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dc.languageen
dc.publisher
dc.relationPhysical Review B - Condensed Matter and Materials Physics
dc.rightsaberto
dc.sourceScopus
dc.titleExafs Investigation Of Local Structure Of Er3+ And Yb 3+ In Low-silica Calcium Aluminate Glasses
dc.typeArtículos de revistas


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