Synthesis, magnetic, AC conductivity and dielectric properties of hematite nanocrystallites

Naresh Babu Gatchakayala; Rama Sekhara Reddy Dachuru

doi:10.15330/pcss.24.2.244-248

Authors

Naresh Babu Gatchakayala Krishna University, Machilipatnam, Andhra Pradesh, India
Rama Sekhara Reddy Dachuru Krishna University, Machilipatnam, Andhra Pradesh, India

DOI:

https://doi.org/10.15330/pcss.24.2.244-248

Keywords:

hematite nanoparticles, Cole-Cole plot, Dielectric properties, AC conductivity, Impedance

Abstract

We are reporting the synthesis along with magnetic, ac conductivity and dielectric properties of hematite nanocrystallites. The prepared Fe₂O₃ is crystallizing in corundum structure which belongs to the rhombohedron system with the space group R3-c. The magnetization data shows a typical Morin transition, T_N = 265 K for 110 nm crystallites, whereas this transition is decreasing with decrease in crystallite size, T_N = 252 K for 33 nm. The value of magnetization is increased with increasing crystallite size. The enhanced dielectric permittivity and ac conductivity were observed in higher hematite crystallite size. The overall dielectric response has revealed conduction mechanism is due to the extrinsic contribution from the dominant Maxwell-Wagner polarization.

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