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EnglishThis paper describes the structure of Er(3+)-doped SiO(2)-HfO(2) waveguides containing nanocrystals of HfO(2). Pure and 1 mol% Er(3+)-doped 70SiO(2)-30HfO(2) films were deposited by the sol-gel method on amorphous SiO(2) substrates using the dip-coating technique. Each waveguide has experienced a single thermal treatment at temperatures ranging from 900 to 1200 degrees C, for either short (30 min) or long (24 h) durations. Crystallization and microstructure were studied by x-ray diffraction (XRD). The local environments of hafnium and erbium ions were determined, respectively, from Hf and Er L(3)-edges extended x-ray absorption fine structure (EXAFS) experiments. Both XRD and EXAFS results demonstrate the substitution of Hf(4+) by Er(3+) ions in the crystalline structure. XRD shows the nucleation of tetragonal HfO(2) nanocrystals after heat treatment at 1000 degrees C for 30 min in the pure waveguide, and at 900 degrees C for 24 h in the waveguide doped with Er(3+). In both series, partial transformation from tetragonal to monoclinic HfO(2) nanocrystals starts after heat treatment at 1100 degrees C for 24 h. The average crystallite size and size distribution can be controlled by thermal annealing temperature and duration, respectively, with brief treatment yielding a more homogeneous nanocrystal size.
| Titolo: | XRD and EXAFS studies on the structure of Er(3+)-doped SiO(2)-HfO(2) glass-ceramic waveguides: Er(3+)-activated HfO(2) nanocrystals |
| Autori: | Afify, Nasser; Dalba, Giuseppe; Rocca, Francesco |
| Autori Unitn: | |
| Titolo del periodico: | JOURNAL OF PHYSICS. B, ATOMIC MOLECULAR AND OPTICAL PHYSICS |
| Anno di pubblicazione: | 2009 |
| Numero e parte del fascicolo: | 11 |
| Codice identificativo Scopus: | 2-s2.0-70149109529 |
| Codice identificativo ISI: | WOS:000266250300051 |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1088/0022-3727/42/11/115416 |
| Handle: | http://hdl.handle.net/11572/90747 |
| Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |
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