Relaxation Processes in Nonlinear Optical Polymer Films
| Authors | T.A. Revenyuk, S.N. Fedosov |
| Affiliations | Department of Physics and Materials Science, Odessa National Academy of Food Technologies, 112 Kanatnaya Str., 65039, Odessa, Ukraine |
| Е-mail | fedosov@optima.com.ua |
| Issue | Volume 2, Year 2010, Number 3 |
| Dates | Received 23.09.2010, in final form – 04.10.2010 |
| Citation | T.A. Revenyuk, S.N. Fedosov, J. Nano- Electron. Phys. 2 No3, 6 (2010) |
| DOI | |
| PACS Number(s) | 82.35.Ej, 82.32.Lr |
| Keywords | Polystyrene, DR1, Nonlinear optical polymers, AC dielectric spectroscopy. |
| Annotation | Dielectric properties of the guest-host polystyrene/DR1 system have been studied by the AC dielectric spectroscopy method at frequencies from 1 Hz to 0,5 MHz and by the thermally stimulated depolarization current (TSDC) method from – 160 to 0 °C. The relaxation peaks at infra-low frequencies from 10 – 5to 10–2 Hz were also calculated using the Hamon’s approximation. Three relaxation processes, namely, α, β and δ ones were identified from the TSDC peaks, while the ε''(f)dependence showed a non-Debye ρ-peak narrowing with temperature. The activation energy of the α-relaxation appeared to be 2,57 eV, while that of the γ-process was 0,52 eV. Temperature dependence of the relaxation time is agreed with the Williams-Landel-Ferry model. The ε''(f)peaks were fitted to Havriliak-Negami’s expression and the corresponding distribution parameters were obtained. |
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List of References |
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