Variation of structural, dielectric and magnetic properties of PVP coated γ-Fe2O3 nanoparticles
| العنوان: | Variation of structural, dielectric and magnetic properties of PVP coated γ-Fe2O3 nanoparticles |
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| المؤلفون: | Rajwali Khan, Zulfiqar, Muneeb-Ur Rahman, Zainab Iqbal |
| المصدر: | Journal of Materials Science: Materials in Electronics. 27:12490-12498 |
| بيانات النشر: | Springer Science and Business Media LLC, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | 010302 applied physics, Materials science, Analytical chemistry, Maghemite, Nanoparticle, 02 engineering and technology, Dielectric, engineering.material, Coercivity, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Magnetization, Nuclear magnetic resonance, Coating, Ferrimagnetism, 0103 physical sciences, engineering, Electrical and Electronic Engineering, 0210 nano-technology, High-κ dielectric |
| الوصف: | Structural, dielectric and magnetic properties of γ-Fe2O3 nanoparticles coated with Polyvinylpyrrolidone were synthesized via co-precipitation method. It was found that the PVP coating resulted in disordered maghemite with reduction in size of nanoparticles from 17 to 9 nm estimated by TEM. The attachment of polymer on the surface of nanoparticles was confirmed by FTIR and TGA and thickness of polymer layer was calculated to be 2.71 nm. The dielectric study shows a strong dependence on coating. The dielectric parameters (e r , tanδ and σ ac ) reduced with PVP coating of γ-Fe2O3 nanoparticles. The dielectric permittivity (e r ) exhibits dispersion behavior and the dielectric loss factor (tanδ) exhibits the Debye’s relaxation peaks whose intensity reduced with PVP coating. The variation of dielectric properties and ac conductivity reveals that the dispersion is due to Maxwell–Wagner interfacial polarization and hopping of charge carriers between Fe2+/Fe3+. The high dielectric constant makes it a promising candidate for device application. The FC/ZFC magnetization measurements showed typical super paramagnetic behavior at room temperature and ferrimagnetic behavior below blocking temperature. It was observed that PVP coating has changed the magnetic properties of the maghemite nanoparticles; i.e. magnetization reduced and coercivity was enhanced. The blocking temperature was shifted towards lower value consistent with particles size reduction. |
| تدمد: | 1573-482X 0957-4522 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::2a5c3e85ffc1408879c61968bcad24c2 https://doi.org/10.1007/s10854-016-5634-7 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........2a5c3e85ffc1408879c61968bcad24c2 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 1573482X 09574522 |
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