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Magnetic field driven dielectric relaxation in non-magnetic composite medium: A low temperature study

Maity, KP and Patra, A and Tanty, N and Prasad, V (2022) Magnetic field driven dielectric relaxation in non-magnetic composite medium: A low temperature study. In: Materials Chemistry and Physics, 289 .

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Official URL: https://doi.org/10.1016/j.matchemphys.2022.126486

Abstract

The frequency dependence of dielectric constant for composites of polyaniline (PANI) and multi-walled carbon nanotube (MWCNT) with different degree of functionalization is studied at low temperature (down to 4.2 K) and magnetic field (up to 3 T) applied both in parallel and perpendicular direction of ac electric field. A relaxation phenomenon is observed in all the MWCNT/PANI composites by applying magnetic field in both the directions, below 103 Hz. However, PANI does not show any relaxation peak with applied magnetic field in either direction. The relaxation peak frequency does not depend on the strength of magnetic field but it varies with temperature and degree of functionalization of MWCNT in composites. This relaxation phenomenon occurs due to the inhomogeneity of the medium of two highly mismatched conductive materials at low temperatures. The results are explained in the light of Parish and Littlewood theory about magnetocapacitance in nonmagnetic composite.

Item Type: Journal Article
Publication: Materials Chemistry and Physics
Publisher: Elsevier Ltd
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Conductive materials; Dielectric relaxation; Electric fields; Multiwalled carbon nanotubes (MWCN); Temperature, Composite medium; Degree of functionalization; Functionalized carbon nanotubes; Lows-temperatures; Magnetic-field; Multi-walled-carbon-nanotubes; Non-magnetic composites; Polyaniline composites; Relaxation peak; Relaxation phenomena, Magnetic fields
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 10 Aug 2022 05:36
Last Modified: 10 Aug 2022 05:36
URI: https://eprints.iisc.ac.in/id/eprint/75770

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