The powder FMR of six ferrites at 9.1 GHz in the temperature range 25 to 290° C is reported in this paper. The effect of the internal fields on the linewidths and the resonance fields are studied. Curie temperatures obtained for some of the ferrites from FMR are compared with the values obtained from an oscillator technique. The line shapes are found to be of Lorenzian shape. Effective g values were calculated and a brief discussion is made about the various contributions to the total field. © 1985 Chapman and Hall Ltd.

O. S. Josyulu

Jandhyala Sobhanadri

MAGNETIC RESONANCE - SPECTRUM ANALYSIS

MAGNETIZATION - DEMAGNETIZATION

CURIE TEMPERATURES

OSCILLATOR TECHNIQUE

POWDER FERROMAGNETIC RESONANCE SPECTRA

RELAXATION PARAMETERS

TRANSITION POINTS

FERRITES

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Powder ferromagnetic resonance spectra of some mixed ferrites

Journal of Materials Science

DC conductivity and dielectric studies of CoxZn1−xFe2O4 (x = 0.32, 0.49, 0.79), BaFe12O19, and Mg0.25Zn0.75Fe2O4 are reported as a function of temperature and frequency. The lattice constant and the existence of a single phase are established from X‐ray studies. The dielectric behaviour is attributed to the Maxwell‐Wagner polarisation. A dispersion region is observed in one of the cobalt‐zinc ferrites and the barium ferrite. Activation energies are calculated for these two ferrites from dielectric measurements. The conductivity of these ferrites is explained by the hopping mechanism. Activation energies and the transition temperatures are presented. Copyright © 1980 WILEY‐VCH Verlag GmbH &amp; Co. KGaA

Journal	Journal of Materials Science
Publisher	Kluwer Academic Publishers
ISSN	00222461
Open Access	No