Role of Mo substitution on electric modulus and electrical conductivity of cobalt-zinc spinel ferrite
A. K. Pradhan (a, *), S. Saha (a), T. K. Nath (b)
a) Department of Physics and Techno Physics, Vidyasagar University, Midnapore - 721102, West Bengal, India.
b) Department of Physics, Indian Institute of Technology (IIT) Kharagpur, Kharagpur - 721302, West Bengal, India.
Carbon - Science and Technology 10/4 (2018) 76 - 81.
© Applied Science Innovations Private Limited, India.
Full Text (OPEN ACCESS): CST-312.pdf
Keywords: Ferrite, spinel, multiferroic, electric modulus, AC conductivity.
Abstract: Cobalt- Zinc ferrites are presently utilized as a significant component material for
fabricating multiferroic composite. Conventional ceramic technique was utilized to synthesize
the bulk cobalt-zinc ferrite with Mo substitution (CZFMO). In this present article, we accounted
for the study of detail electric modulus and electrical conductivity of Co0.65Zn0.35Fe2-xMoxO4
(x=0.0, 0.1 and 0.2) spinel ferrites. The production of the inverse spinel nature of the material
structure has been affirmed by the high resolution XRD pattern. The frequency reliance of real
and imaginary part of electric modulus have been studied in detail. In the present framework the
behavior of electric modulus could be communicated by the modified Kohlrausch-WilliumsWatts (KWW) equation. The variation of the imaginary part of electric modulus (Mʺ) with
frequency indicates the existence of non-Debye relaxation process in the current samples. The
curves showing the variation of ac conductivity with frequency follow the Jonscher’s single
power equation. This suggest that the conduction in the material is due to correlated barrier
hopping (CBH) mechanism. Additionally, the conduction procedure can be best clarified based
on Verwey-de Boer method. The activation energy in both ferromagnetic and paramagnetic area
is assessed from the ln σac vs. 1/T curves. The temperature reliance of dc conductivity obeys the
Arrhenius expression. Also the semiconducting nature of material has confirmed from the
conductivity plot.
