Special aspects of the temperature dependence of EPR absorption of chemically carbonized polyvinylidene fluoride derivatives
| Autor: | L. A. Pesin, V. E. Zhivulin, D. V. Ivanov |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Free electron model Materials science Solid-state physics 010405 organic chemistry Radical Analytical chemistry Activation energy Condensed Matter Physics 01 natural sciences Polyvinylidene fluoride 0104 chemical sciences Electronic Optical and Magnetic Materials law.invention Paramagnetism chemistry.chemical_compound Nuclear magnetic resonance chemistry law 0103 physical sciences Absorption (electromagnetic radiation) Electron paramagnetic resonance |
| Zdroj: | Physics of the Solid State. 58:86-90 |
| ISSN: | 1090-6460 1063-7834 |
| DOI: | 10.1134/s1063783416010340 |
| Popis: | The temperature dependences of electron paramagnetic resonance (EPR) absorption of two samples of chemically carbonized derivatives of polyvinylidene fluoride (PVDF) synthesized under different conditions have been measured in the range of 100–300 K. It has been found that the temperature dependence of the integrated intensity of the EPR signal of both samples is nonmonotonic and does not obey the classical Curie dependence characteristic of free radicals. An analytical expression that is consistent with experimental data and suggests the presence of an activation component of paramagnetism in the test samples has been obtained. The presence of a term independent of temperature in this equation also indicates the paramagnetic contribution of free electrons. The magnitude of the activation energy of the singlet–triplet transitions has been evaluated: δ = 0.067 eV. The HYSCORE spectra of chemically carbonized PVDF derivatives have been obtained for the first time. |
| Databáze: | OpenAIRE |
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