Local structure around Er3+ in SiO2-HfO2 glassy waveguides using EXAFS (Articolo in rivista)

Type
Label
  • Local structure around Er3+ in SiO2-HfO2 glassy waveguides using EXAFS (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.76.024114 (literal)
Alternative label
  • N.D. Afify; G. Dalba; C. Armellini; M. Ferrari; F. Rocca; A. Kuzmin (2007)
    Local structure around Er3+ in SiO2-HfO2 glassy waveguides using EXAFS
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • N.D. Afify; G. Dalba; C. Armellini; M. Ferrari; F. Rocca; A. Kuzmin (literal)
Pagina inizio
  • 024114 (literal)
Pagina fine
  • 1/8 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 76 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • N. D. Afify and G. Dalba Dipartimento di Fisica, Università degli Studi di Trento, Via Sommarive 14, I-38100 Povo (Trento), Italy C. Armellini, M. Ferrari, and F. Rocca IFN-CNR, Istituto di Fotonica e Nanotecnologie del Consiglio Nazionale delle Ricerche, (literal)
Titolo
  • Local structure around Er3+ in SiO2-HfO2 glassy waveguides using EXAFS (literal)
Abstract
  • Er3+-doped SiO2-HfO2 glassy waveguides with HfO2 concentrations ranging from 10 to 50 mol % were prepared using the sol-gel route and deposited on v-SiO2 substrates using the dip-coating technique. The local environment around Er3+ ions was determined from Er L3-edge extended x-ray-absorption fine-structure (EXAFS) measurements. The first coordination shell around Er3+ ions is composed of oxygen atoms. Hafnium is the main constituent of the second coordination shell of Er3+, differing from the cases of pure SiO2 and SiO2-TiO2 glassy hosts, in which silicon is the main atomic species. The local structure around Er3+ ions has been found to be independent on HfO2 concentration within the studied composition range. This fact implies that Er3+ ions are preferentially dispersed in HfO2-rich regions of the glassy waveguide, even at the lowest HfO2 concentration. For all samples, no Er3+-Er3+ coordination shell has been detected by EXAFS. The presented structural results allow us to understand some spectroscopic properties typical of Er3+-doped SiO2 glassy waveguides co-doped with HfO2. (literal)
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