Influence of Ferroelectric Filler Size and Clustering on the Electrical Properties of (Ag–BaTiO3)–PVDF Sub-Percolative Hybrid Composites
- Leontin PadurariuLeontin PadurariuDielectrics, Ferroelectrics & Multiferroics Group, Faculty of Physics, Al. I. Cuza University of Iasi, Bv. Carol I, No. 11, 700506Iasi, RomaniaMore by Leontin Padurariu
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- Nadejda Horchidan*Nadejda Horchidan*Email: [email protected]Dielectrics, Ferroelectrics & Multiferroics Group, Faculty of Physics, Al. I. Cuza University of Iasi, Bv. Carol I, No. 11, 700506Iasi, RomaniaMore by Nadejda Horchidan
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- Cristina Elena CiomagaCristina Elena CiomagaDepartment of Exact & Natural Sciences, Institute of Interdisciplinary Research, Al. I. Cuza University of Iasi, Bv. Carol I, No. 11, 700506Iasi, RomaniaMore by Cristina Elena Ciomaga
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- Lavinia Petronela CurecheriuLavinia Petronela CurecheriuDielectrics, Ferroelectrics & Multiferroics Group, Faculty of Physics, Al. I. Cuza University of Iasi, Bv. Carol I, No. 11, 700506Iasi, RomaniaMore by Lavinia Petronela Curecheriu
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- Vlad Alexandru LukacsVlad Alexandru LukacsDielectrics, Ferroelectrics & Multiferroics Group, Faculty of Physics, Al. I. Cuza University of Iasi, Bv. Carol I, No. 11, 700506Iasi, RomaniaMore by Vlad Alexandru Lukacs
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- Radu Stefan StirbuRadu Stefan StirbuDielectrics, Ferroelectrics & Multiferroics Group, Faculty of Physics, Al. I. Cuza University of Iasi, Bv. Carol I, No. 11, 700506Iasi, RomaniaMore by Radu Stefan Stirbu
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- George StoianGeorge StoianNational Institute of R&D for Technical Physics, 700050Iasi, RomaniaMore by George Stoian
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- Mihaela BoteaMihaela BoteaNational Institute of Materials Physics, Atomistilor 405A, 077125Magurele, RomaniaMore by Mihaela Botea
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- Mihaela FloreaMihaela FloreaNational Institute of Materials Physics, Atomistilor 405A, 077125Magurele, RomaniaMore by Mihaela Florea
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- Valentin Adrian MaraloiuValentin Adrian MaraloiuNational Institute of Materials Physics, Atomistilor 405A, 077125Magurele, RomaniaMore by Valentin Adrian Maraloiu
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- Lucian PintilieLucian PintilieNational Institute of Materials Physics, Atomistilor 405A, 077125Magurele, RomaniaMore by Lucian Pintilie
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- Aurelian RotaruAurelian RotaruFaculty of Electrical Engineering and Computer Science & MANSiD Research Center, Stefan Cel Mare University, 720229Suceava, RomaniaMore by Aurelian Rotaru
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- Liliana Mitoseriu*Liliana Mitoseriu*Email: [email protected]Dielectrics, Ferroelectrics & Multiferroics Group, Faculty of Physics, Al. I. Cuza University of Iasi, Bv. Carol I, No. 11, 700506Iasi, RomaniaMore by Liliana Mitoseriu
Abstract
The paper presents a study concerning the role of ferroelectric filler size and clustering in the dielectric properties of 20%BaTiO3–80%PVDF and of 20% (2%Ag–98%BaTiO3)–PVDF hybrid nanocomposites. By finite element calculations, it was shown that using fillers with ε > 103 does not provide a permittivity rise in the composites and the effective dielectric constant tends to saturate to specific values determined by the filler size and agglomeration degree. Irrespective of the ferroelectric filler sizes, the addition of metallic ultrafine nanoparticles (Ag) results in permittivity intensification and the effect is even stronger if the metallic nanoparticles are connected to a higher degree with the ferroelectric particles’ surfaces. When using coarse ferroelectric fillers, the probability of clustering is higher, thus favoring the permittivity increase by field concentration in small regions close to the interfaces separating dissimilar materials. The modeling results were validated by an experimental dielectric analysis performed in a series of PVDF-based thick films with the same amount of BaTiO3 fillers or with Ag–BaTiO3 hybrid fillers. Similar trends as predicted by simulations were found experimentally but with slightly higher permittivity values which were assigned to the modifications of the polymer phase composition due to the presence of nanofillers and the local sample inhomogeneity (the presence of clustering, in particular for coarse BaTiO3 grains), which create regions with enhanced local fields.
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This article is cited by 1 publications.
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