Composition dependent elastic and thermal properties of Li-Zn ferrites

Abstract

We report the composition dependent elastic and thermal properties of LieZn ferrite (Li(0.5-x/2)ZnxFe(2.5-x/) O-2(4), x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) ceramics. The IR absorption frequencies (obtained from the Fourier transform infrared spectra), the lattice parameters and the mass-densities were used to evaluate the elastic and thermal parameters such as force constant, elastic moduli and Debye temperature of the studied LieZn ferrite samples as a function of Zn-content x. The observed force constants were low in value for the octahedral site complexes than that of the tetrahedral site complexes, but both the force constants were increasing with increasing Zn content. The longitudinal elastic wave velocities in the sample were higher than the transverse wave velocities. The elastic moduli such as Young's modulus (E), bulk modulus (B) and rigidity modulus (G) showed increasing trends with Zn concentration in the samples. The calculated Debye temperature (theta(D)) is near to the literature values obtained experimentally. Our results provide a better understanding of the variation of mechanical, elastic and thermal properties of LieZn ferrites. (C) 2017 Elsevier B.V. All rights reserved.