Relaxation in homogeneous and non-homogeneous polarized systems. A mesoscopic entropy approach
| Autor: | Jose Guillermo Mendez-Bermúdez, Iván Santamaría-Holek |
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| Rok vydání: | 2010 |
| Předmět: |
Statistics and Probability
Physics Mesoscopic physics Relaxation (NMR) FOS: Physical sciences Probability density function Dielectric Condensed Matter - Soft Condensed Matter Condensed Matter Physics Entropy (classical thermodynamics) Classical mechanics Electric field Soft Condensed Matter (cond-mat.soft) Dielectric loss Statistical physics Pseudovector |
| Zdroj: | Physica A: Statistical Mechanics and its Applications. 389:1819-1828 |
| ISSN: | 0378-4371 |
| DOI: | 10.1016/j.physa.2009.12.058 |
| Popis: | The dynamics of a degree of freedom associated to an axial vector in contact with a heat bath is decribed by means of a probability distribution function obeying a Fokker-Planck equation. The equation is derived by using mesoscopic non-equilibrium thermodynamics and permits a formulation of a dynamical theory for the axial degree of freedom (orientation, polarization) and its associated order parameter. The theory is used to describe dielectric relaxation in homogeneous and non-homogeneous systems in the presence of strong electric fields. In the homogeneous case, we obtain the dependence of the relaxation time on the external field as observed in experiments. In the non-homogeneous case, our model account for the two observed maxima of the dielectric loss giving a good quantitative description of experimental data at all frequencies, especially for systems with low molecular mass. Comment: 19 pages, 3 tables |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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