Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/1598
Title: Poly(vinylidene fluoride)–La0.5Sr0.5CoO3-delta composites: the influence of LSCO particle size on the structure and dielectric properties
Authors: Deepa, K S
Shaiju, P
Sebastian, M T
Bhoje Gowd, E
Jose James
Keywords: Dielectric composites
Poly(vinylidene fluoride)
Polar crystals
LSCO particles
Issue Date: 2014
Publisher: Royal Society of Chemistry
Citation: Physical Chemistry Chemical Physics 16(32):17008-17017;28 Aug 2014
Abstract: Dielectric composites composed of poly(vinylidene fluoride) (PVDF) and La0.5Sr0.5CoO3-delta (LSCO) with high permittivity, low loss and high breakdown strength have been developed. The effects of particle size of LSCO (fine (250 nm) and coarse (3 mum)) on the phase crystallization of PVDF and dielectric properties of polymer-LSCO composites are studied. The inclusion of fine LSCO into PVDF readily favours the formation of polar crystals (beta and gamma-phases), which makes the composite suitable for both electromechanical and high charge storage embedded capacitor applications. Moreover, the addition of fine LSCO particles also increases the overall crystallization rate as well as the melting point of PVDF. The composite containing fine LSCO particles gave a percolation threshold at about 25 volume percentage, while that with coarse particles did not show any percolation even at very high volume percentage. As a result of fine LSCO particle loading, the composite exhibited a relative permittivity (epsilonr) of 600, a conductivity of 2.7 * 10(-7) S cm(-1), a dielectric loss (tandelta) of 0.7 at 1 kHz and a breakdown voltage of 100 V even at 20 volume percentage of a filler, demonstrating promising applications in the embedded capacitors.
ISSN: 1463-9084
Appears in Collections:2014

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