Browsing by Author "R.N. Mahaling"

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Enhanced dielectric and electrical properties of tri-phase percolative PVDF–BiFeO3–Carbon Black (CB) composite film
(Springer, 2021) Srikanta Moharana; Tarun Yadav; Parvez Ahmad Alvi; Amit Pathak; R.N. Mahaling
A tri-phase polymer composite film with a multiferroic phase (BiFeO3) and conductive carbon black (CB) deposited on the BiFeO3 (BF) and poly(vinylidene fluoride) (PVDF) matrix were prepared by using a solution casting technique. The dielectric and electrical performance of BF–PVDF composites with various weight percentages of CB content was studied. It has been observed that the incorporation of high loading of CB to the BF–PVDF composite system led to a significant improvement in the dielectric constant with suppressed dielectric loss (< 0.5). The high dielectric constant of 69 at 100 Hz, which is 11 times greater than that of neat PVDF film with a lower dielectric loss of 0.41, is obtained for PVDF–BF–CB composites as CB content (8 wt%) approached the percolation threshold. Furthermore, the improvement of dielectric and electrical performance of the PVDF–BF–CB composites may be due to the synergistic effect of the multiferroic phase BF and conductive phase CB as a result of homogeneous dispersion within the polymer matrix. These high dielectric constant and suppressed dielectric loss PVDF–BF–CB composites might be suitable for potential applications in the field of future thin-film capacitors. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature.
Superior dielectric and electrical characteristics of poly(methylmethacrylate) (PMMA)-BiFeO3-Polystyrene-2% divinyl benzene (PDB) composites
(Elsevier GmbH, 2023) N.P. Yadav; Bibhuti B. Sahu; R.N. Mahaling; Tarun Yadav; Pankaj K. Tripathi; Srikanta Moharana
An extraordinarily high dielectric constant and low dielectric loss PMMA-BFO-PDB composite material was developed by mixing poly(methylmethacrylate) (PMMA) as the polymer matrix, bismuth ferrite (BFO), and polystyrene 2% divinyl benzene (PDB) as fillers using the solution casting process. The surface morphology analysis demonstrations the PDB particle uniformly dispersed in the PMMA matrix. The frequency dependent dielectric and electrical characteristics of the PMMA-BFO-PDB composite films on various weight percentages of PDB contents and wide range of frequency at room temperature were investigated. It is observed that the maximum dielectric constant of the PMMA-BFO-PDB composites was achieved around ≈ 108 and similarly dielectric loss factor of just about ≈ 1 for 20 wt% of PDB contents at 102 Hz. In addition, the PMMA-BFO-PDB composite achieved a dielectric constant of 108 at 102 Hz, which is 21 times higher than that of the pure PMMA matrix. PMMA-BFO-PDB composite films may be used as a high performance dielectric in future energy storage devices, such as high storage capacitors. © 2023 Elsevier GmbH