[Show abstract][Hide abstract] ABSTRACT: The dielectric properties of TEA-CoCl2 Br2 nanocrystals incorporated into the
polymethylmethacrylate matrix within the frequency range of 3 × 105 –2.6 × 109 Hz in the
temperature region of 90–300 K were investigated. The considerable difference in the dielectric
spectra of the nanocomposite compared to those of the bulk crystal and the pure polymer matrix
was observed. The dielectric dispersion of the composite material reveals a resonance type
(resonance frequency was found to be near 1.3 GHz) and may be qualitatively explained as the
result of piezoelectric resonance on the nanocrystals. The model interpretation of this
phenomenon based on the forced-dumped oscillator is presented.
[Show abstract][Hide abstract] ABSTRACT: We have studied lattice dynamic properties of SrTiO3 thin films from 5 to 300 K using metal-oxide bilayer Raman scattering. First-order zone-center optical phonons, symmetry forbidden in single crystals, have been observed in the thin films, indicating strain-induced lowering of symmetry. The asymmetric line shape of the TO2 phonon is interpreted as evidence for micropolar regions in the thin films, likely due to oxygen vacancies. The optical phonon lines and the asymmetry persist up to room temperature.
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