Eur. Phys. J. Appl. Phys. 33, 189-193 (2006)
https://doi.org/10.1051/epjap:2006016

Structural, AC conductivity and dielectric properties of Sr-La hexaferrite

¹ Department of Physics, Guru Nanak Dev University, Amritsar, India
² Department of Electronics and Technology, Guru Nanak Dev University, Amritsar, India
³ School of Physics and materials Science, Thapar Institute of Engineering and Technology, Patiala, India

Corresponding author: sukhleen2@yahoo.com

Received: 29 June 2005
Revised: 30 October 2005
Accepted: 10 November 2005
Published online: 22 February 2006

Abstract

A series of M-type hexaferrite samples with composition Sr_1−xLa_xFe₁₂O₁₉ (x = 0.00, 0.05, 0.15 and 0.25) were prepared by standard ceramic technique. AC electrical conductivity measurements were carried out at different frequencies (20 Hz–1 MHz) and at different temperatures. The dielectric constant and dielectric loss tangent were measured in the same range of frequencies. The experimental results indicate that AC electrical conductivity increases on increasing the frequency as well as the temperature, indicating magnetic semiconductor behavior of the samples. The increase in AC electrical conductivity with frequency and temperature has been explained on the basis of Koops Model whereas dielectric constant and dielectric loss tangent has been explained with the Maxwell–Wagner type interfacial polarization in agreement with the Koops phenomenological theory.