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Title: Optical studies of transparent ferroelectric strontium-barium niobate/silica nanocomposite
Authors: Lu, S. G.
Mak, Chee-leung
Wong, Kin-hung
Subjects: Silicon compounds
Strontium compounds
Barium compounds
Ferroelectric ceramics
X-ray diffraction
Raman spectra
Particle size
Differential scanning calorimetry
Ferroelectric transitions
Ultraviolet spectra
Visible spectra
Spectral line shift
Refractive index
Issue Date: 1-Sep-2003
Publisher: American Institute of Physics
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.
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
Type: Journal/Magazine Article
DOI: 10.1063/1.1599047
ISSN: 0021-8979 (print)
1089-7550 (online)
Appears in Collections:MRC Journal/Magazine Articles
AP Journal/Magazine Articles

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