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Title: Influence of Sn/Nb on the resistivity of Mn-Zn ferrites
Authors: Rao, A D P
Ramesh, B
Rao, P R M
Raju, S B
Issue Date: Jan-1999
Publisher: NISCAIR-CSIR, India
Abstract: Effects of  Sn4+/Nb5+  on dc resistivity as a function of dopant concentration, temperature and duration of applied field for Mn- Zn ferrites has been studied. Frequency response of ac resistivity for all the specimens has also been evaluated. Results are discussed considering vacancies, influence of vacancies, valence fluctuations along with hopping mechanism. Two transition temperatures Ts and Tc are observed relating to change in the conduction mechanism at low temperature range and in high temperature range due to transformation from ferromagnetic to paramagnetic state. Activation energies obtained in low temperature range are lower than high temperature range activation energy values and are explained. The decrease of ac resistivity with frequency is attributed to the dielectric relaxation caused by bound charge carriers.
Page(s): 51-56
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.37(01) [January 1999]

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