A study of the influence of crystallite size on the electrical and magnetic properties of CuFe(2)O(4)

Author(s)

Muhammad Javed Iqbal, Nadia Yaqub, Bogdan Sepiol, Bushra Ismail

Abstract

An attempt has been made to clarify the fundamental assumption that the properties of materials change as the crystallite size of the material is reduced below 100 nm. CuFe(2)O(4) samples of different crystallite sizes were prepared by the sol-gel and combustion methods and then analyzed by X-ray diffraction (XRD), thermal analyses (TGA/DTG) and scanning electron microscopy (SEM) techniques. The magnetic properties were studied by measuring the AC magnetic susceptibility (chi) and the Mossbauer spectroscopy. The DC electrical resistivity, dielectric constant, dielectric loss tangent, Curie temperature and hyperfine splitting of the samples change with the crystallite size. The change in the electrical properties is attributed to the formation of discrete energy levels instead of the bands. However, the magnetic parameters change due to the existence of non magnetic surface layers. The isomer shift and the hyperfine splitting show gradual increase with the increase in crystallite sizes.

Organisation(s)

Dynamics of Condensed Systems

External organisation(s)

Quaid-i-Azam University

Journal

Materials Research Bulletin

Volume

46

Pages

1837-1842

No. of pages

6

ISSN

0025-5408

DOI

https://doi.org/10.1016/j.materresbull.2011.07.036

Publication date

2011

Peer reviewed

Yes

Austrian Fields of Science 2012

103015 Condensed matter, 103018 Materials physics

Portal url

https://ucrisportal.univie.ac.at/en/publications/db8581df-c69d-48a3-8e9c-6b2c456d51a5