Effect of local structure of MnCl2-filled PVDF films on their optical, electrical, electron spin resonance, and magnetic properties
✍ Scribed by A. Tawansi; A. H. Oraby; E. M. Abdelrazek; M. I. Ayad; M. Abdelaziz
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 292 KB
- Volume
- 70
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
✦ Synopsis
The filling level (W ) dependence of the local structure of MnCl 2 through the PVDF matrix was explored. The presence of aand b-PVDF crystalline phases were detected by X-ray diffraction, and it was confirmed by the infrared (IR) absorption spectra. A significant head-to-head content was implied by IR spectroscopy. Two filling, level-dependent optical energy gaps were found through the UV-VIS spectral investigation. An intrachain one-dimensional interpolaron hopping mechanism was assumed to proceed in the temperature range of 350-375 K. The calculated values of the charge carrier hopping distance were in the range of 6.5-9.7 nm. The temperature dependence of the direct current (dc) magnetic susceptibility exhibited a Curie-Weiss behavior. Positive values of the paramagnetic Curie temperature ( u p ) for W up to 14.5% indicated the presence of a ferromagnetic interaction, while negative u p obtained for higher W values suggested an antiferromagnetic interaction at lower temperature. The electron spin resonance (ESR) analysis revealed the existance of both isolated and aggregated Mn 2/ ions within the PVDF matrix.