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http://hdl.handle.net/10397/4191
| Title: | Optical studies of transparent ferroelectric strontium-barium niobate/silica nanocomposite | Authors: | Lu, SG Mak, CL Wong, KH |
Issue Date: | 1-Sep-2003 | Source: | Journal of applied physics, 1 Sept. 2003, v. 94, no. 5, p. 3422-3426 | Abstract: | Transparent ferroelectric strontium–barium niobate (SBN) doped silica nanocomposites were prepared via a modified sol–gel process. Their structural properties were characterized by x-ray diffraction and Raman spectroscopy. It was found that by annealing the nanocomposites at temperatures between 600 and 800 °C, pure tetragonal tungsten bronze phase SBN crystallites with sizes ranging from 8 to 23 nm were obtained. Differential scanning calorimetry measurement has indicated that nanometer size ferroelectric SBN has a reduced phase transition temperature compared with that of bulk SBN. Photoluminescence and optical transmission studies of these composites have revealed noticeable blueshifts in the emission band peak and the absorption edge, respectively. The refractive index of the nanocomposite annealed at 700 °C was measured by ellipsometry. The value obtained is larger than that of pure sol–gel derived silica but smaller than that of SBN crystal, and can be described by the Bruggeman effective medium approximation. | Keywords: | Silicon compounds Strontium compounds Barium compounds Ferroelectric ceramics Nanocomposites Transparency X-ray diffraction Raman spectra Annealing Crystallites Particle size Differential scanning calorimetry Ferroelectric transitions Photoluminescence Ultraviolet spectra Visible spectra Spectral line shift Refractive index Ellipsometry |
Publisher: | American Institute of Physics | Journal: | Journal of applied physics | ISSN: | 0021-8979 | EISSN: | 1089-7550 | DOI: | 10.1063/1.1599047 | Rights: | © 2003 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in S. G. Lu, C. L. Mak & K. H. Wong, J. Appl. Phys. 94, 3422 (2003) and may be found at http://link.aip.org/link/?jap/94/3422. |
| Appears in Collections: | Journal/Magazine Article |
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