Synthesis and study the physical properties of the nanosized Li0.5AlxFe2.5-xO4 samples

Abstract

Nanoparticles of Li0.5AlxFe2.5-xO4 (x = 0.00, 0.15, 0.25, 0.35, 0.45) have been synthesized by using a chemical auto-combustion method. The effect of varying Al3+ ions content on the microstructure, magnetic, thermal, and dc electrical conductivity, mobility and activation energy of the as-prepared nanosamples have been studied. The obviously low loss thin hysteresis curve of the M-H relation reveals that the present materials are classified soft magnetic. The dependence of magnetic properties on adding Al3+ ions is explained as due to many factors such as crystallite size, measured density, porosity, expected cation distribution, and magnetocrystalline anisotropy. The cation distributions for all samples have been suggested such that the experimental and theoretical values of magnetic moments and lattice constants are in good consistency. Moreover, the pure Li-ferrite sample of (x = 0) has lower values of thermal conductivity, specific heat capacity, and thermal effusivity; and higher values of thermal diffusivity than those of the Al substituted Liferrite samples. The reasons of this behavior have been discussed. Also, the temperature and the chemical composition dependence of dc conductivity and drift mobility of the prepared samples have been studied.