Novel three phase polyvinyl alcohol (PVA)-nanographite (GNP) -Pb(ZrTi)O3 (PZT) composites with high dielectric permittivity. (29th July 2018)

• Record Type: Journal Article
• Authors: Moharana, Srikanta; Mahaling, Ram Naresh
• Is Part Of: Materials research innovations. Volume 22:Number 5(2018)
• Page Start: 254
• Page End: 260
• Publication Date: 2018-07-29
• Subjects: Nanographite -- Pb(ZrTi)O3 -- composite -- polyvinyl alcohol -- dielectric permittivity; Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1080/14328917.2017.1304858
• Languages: English
• ISSNs: 1432-8917

Abstract

Abstract: Novel three phase composites were prepared by embedding nanographite (GNP) and lead zircon ate titanate (Pb(ZrTi)O3 ; PZT) into the polyvinyl alcohol (PVA) matrix via solution casting technique. The structural analysis was carried out by using X-ray diffraction technique, which indicated the tetragonal structure of Pb(ZrTi)O3 (PZT). The frequency dependences of dielectric, electrical and ferroelectric properties of the PVA-PZT-GNP composites on different volume fractions of GNP were investigated. The percolation theory was used to progress the dielectric and electrical performance of PVA-PZT-GNP composite. It was observed that the PVA-PZT-GNP composite showed insulator-conductor transition with percolation threshold of 5 vol% of nanographite. The dielectric permittivity of PVA-PZT-GNP composite was achieved as high as ≈117 at 100 Hz at percolation threshold, which was about 17 and 5 times higher than that of pure PVA and PVA-PZT composite, respectively. The ferroelectric hysteresis loop investigation indicated that the three phase composites exhibited much higher electric polarization than that of two phase PVA-PZT composite systems.