| Journal: | Brazilian journal of physics |
| Database: | PERIÓDICA |
| System number: | 000154224 |
| ISSN: | 0103-9733 |
| Authors: | Macdonald, J. Ross1 |
| Institutions: | 1University of North Carolina, Department of Physics and Astronomy, Chapel Hill, Carolina del Norte. Estados Unidos de América |
| Year: | 1999 |
| Season: | Jun |
| Volumen: | 29 |
| Number: | 2 |
| Pages: | 332-346 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico |
| English abstract | Relations and distinctions which are relavant to small-signal electrical-relaxation behavior are reviewed and applied to the important problem of identifying the physical processes leading to dispersed relaxation response. Complex-nonlinear-least-squares fitting of a response model to frequency-response data is found not to allow one to distinguish unambiguously in most cases between conductive-system response of Wagner-Voigt type, which may be characterized by a distribution of conductive system relaxation times [DCRT], and dielectric- system response of Maxwell type, characterized by a distribution of dielectric-system relaxation times [DDRT]. In general, one must include a parallel conductivity element CP, as well as a high-frequency-limiting dielectric constant, in a conductive-system fitting model used to represent dielectric-system data with non-zero dc conductivity. Contrary to earlier predictions of Gross and Meixner, accurate numerical inversion of a set of exact frequency- response data to estimate the distribution with which it is associated shows that no discrete line necessarily appears in a DCRT associated with a truncated continuous DDRT. A discrete line can appear in general, however, when 0 and is unaccounted for in an inversion process. The novel result is established that a data set mathematically described in terms of a dielectric system with dc leakage and inv |
| Disciplines: | Física y astronomía |
| Keyword: | Física de materia condensada, Dieléctricos, Respuesta eléctrica, Conductividad, Relajación |
| Keyword: | Physics and astronomy, Condensed matter physics, Dielectrics, Electrical respone, Conductivity, Relaxation |
| Full text: | Texto completo (Ver HTML) |
