Magnetic properties of Co3O4 polycrystal powder

Abstract

The results of investigations of magnetic properties of Co<inf>3</inf>O<inf>4</inf> polycrystals in powder morphology with average crystallite size of 10 µm are presented. The temperature dependence of the magnetic susceptibility, measured in a wide temperature interval (1.5≤T≤400 K) using SQUID magnetometer, as well as electron spin resonance (ESR) spectra measured at X-band and Q-band frequency ranges have been studied. Antiferromagnetism with a Néel temperature T<inf>N</inf> at about 39 K was observed from the analysis of evolution of molar magnetic susceptibility and ESR intensity as a function of temperature. ESR parameters namely g-factor, intensity (I<inf>ESR</inf>), g-value, and linewidth ΔH for powder Co<inf>3</inf>O<inf>4</inf> have been obtained. Some deviations from the expected values of some magnetic properties were determined and discussed. © 2016 Elsevier B.V., All rights reserved.