Structural, elastic and magnetic properties of spinel Co 3 O 4

Abstract

We have investigated the structural and magnetic properties of Co 3 O 4 ceramic synthesized by solid state reaction method. Powder X-ray diffraction (XRD), Raman spectroscopic and Fourier transforms infrared (FTIR) analysis reveals single phase formation at room temperature. Analysis of XRD data indicates that the Co 3 O 4 crystallizes in cubic symmetry with face-centered cubic (fcc) Bravais lattice. Force constants and elastic properties have been estimated at room temperature using XRD and FTIR spectra and interpreted in terms of bond lengths. An octahedral broadening of the FTIR band ( v o ) and large force constant (k o ) has been observed and indicated the inverse proportionality relationship between the force constant and the bond length. The elastic moduli and Poisson’s ratio uncorrected and corrected to zero porosity reveals the solidification of the Co 3 O 4 ceramic sample. The field cooled (FC) and zero field cooled (ZFC) magnetization measurements using superconducting quantum interface device (SQUID) magnetometer exhibit a well-defined long-range antiferromagnetic order below transition ( T N = 40 K) temperature.