T. PAULOSE¹, K. E. ABRAHAM^1,*

Abstract

We report dielectric and electron transport properties of hydrothermally synthesized ecofriendly Fe2O3 hexagonal nanomorphotype. The space charge polarization and orientational polarizations are the main mechanisms behind the dielectric property of Fe2O3 nanostructure. The frequency and temperature dependent impedance analysis was carried out in the frequency range 100Hz-1MHz. By theoretical fitting methods, the dielectric relaxation formalism has been identified as the Cole-Cole like relaxation. The AC conductivity in the nanomorphotype obeys the universal power law and also the frequency exponent parameter “s” decreases with increase in temperature. Correlating the nature of “s” with various theoretical models and observing that the conduction mechanism is mostly due to the thermally activated charge carriers, both overlapped polaron hopping transport (OLPT) and correlated barrier hopping (CBH) theoretical models are found to be valid in the present case. The dielectric study of Fe2O3 hexagonal nanomorphotype opens up the way for developing charge storage devices with least environmental hazard..

Keywords

Fe2O3 hexagonal nanomorphotype, Dielectric properties, Impedance spectroscopy, AC conductivity.

Submitted at: March 21, 2016
Accepted at: June 7, 2017

Citation

T. PAULOSE, K. E. ABRAHAM, Dielectric relaxation and AC conductivity mechanism of eco-friendly Fe2O3 hexagonal nanomorphotype, Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 5-6, pp. 440-446 (2017)

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