Eur. Phys. J. Appl. Phys.
Volume 33, Number 3, March 2006
|Page(s)||189 - 193|
|Section||Magnetism and Superconductivity|
|Published online||22 February 2006|
Structural, AC conductivity and dielectric properties of Sr-La hexaferrite
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: email@example.com
Revised: 30 October 2005
Accepted: 10 November 2005
Published online: 22 February 2006
A series of M-type hexaferrite samples with composition Sr1−xLaxFe12O19 (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.
PACS: 75.50.Gg – Ferrimagnetics / 72.20.-i – Conductivity phenomena in semiconductors and insulators / 77.22.Ch – Permittivity / 75.30.Kz – Magnetic phase boundaries
© EDP Sciences, 2006
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