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DIELECTRIC BEHAVIOUR OF NIOBIUM DOPED Ni-Zn FERRITES

B. Parvatheeswara Rao1, K. H. Rao1, K. Trinadh2, O. F. Caltun3,*

Affiliation

  1. Department of Physics, Andhra University, Visakhapatnam 530003, India
  2. Naval Science and Technological Laboratory, Visakhapatnam 530027, India
  3. Department of Electricity and Electronics, A. Z. Cuza University, Iasi, Romania

Abstract

Polycrystalline Ni-Zn ferrites with the formula Ni0.65 Zn0.35 Fe2 O4 + x Nb2 O5 with x values ranging from 0.0 to 1.5 wt% in steps of 0.3 wt% have been prepared by conventional ceramic technique to investigate and understand the influence of pentavalent niobium additions on the dielectric behavior of Ni-Zn ferrites as a function of composition and frequency. Dielectric constants of these ferrites have been found to be of the order of 106. The dielectric constant of any sample containing niobium addition is higher than the undoped one. However, the dielectric constant is found to decrease by increasing the concentration of the additive. The dielectric loss has been found to be smaller for the samples containing niobium. The dependence of dielectric constant and the variation of tan with frequency exhibit normal behavior up to 4 MHz beyond which they experienced dimensional resonances. The results are explained on the basis of Koop’s two layer model and Maxwell-Wagner polarization theory..

Keywords

Ni-Zn ferrites, Niobium additives, Dielectric properties.

Submitted at: April 4, 2004
Accepted at: June 22, 2004

Citation

B. Parvatheeswara Rao, K. H. Rao, K. Trinadh, O. F. Caltun, DIELECTRIC BEHAVIOUR OF NIOBIUM DOPED Ni-Zn FERRITES, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 3, pp. 951-954 (2004)