Gupta, Pallavi and Kumar, Ashok and Tomar, Monika and Gupta, Vinay and Singh, Dwijendra P. (2017) Enhanced dielectric properties and suppressed leakage current density of PVDF composites flexible film through small loading of submicron Ba0.7Sr0.3TiO3 crystallites. Journal of Materials Science: Materials in Electronics, 28. pp. 11806-11812. ISSN 0957-4522

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Ba0.7Sr0.3TiO3 (BST) crystallites prepared by sol-gel technique are incorporated into poly(vinylidene fluoride) PVDF matrix by solution casting technique. Cuboid shape of crystallite has been confirmed by high resolution transmission electron microscopy. PVDF composite films exhibit high dielectric constant and very low leakage current density. The dielectric constant similar to 22 (at 1 kHz) has been obtained for composites containing 11 vol% of BST crystallite; which is similar to 3 times higher than the dielectric constant of the pure PVDF (similar to 7.9). Moreover, the leakage current density with same loading of BST crystallite increased only by one order (i.e. 10(-7)Amp/cm(2) for pure PVDF to 10(-6)Amp/cm(2)). The observed value of leakage current density is very small as compared to earlier reports. The dielectric loss was found to be 0.02-0.03 at 1 kHz, which is also very small. The improved dielectric behavior is attributed to the improved interface between PVDF and BST crystallite and, the suppressed leakage current density might be arising due to smaller conducting pathways at interface.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Springer Verlag.
Subjects: Engineering > Electronics and Electrical Engineering
Materials Science
Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 06 Sep 2018 11:09
Last Modified: 06 Sep 2018 11:09

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