Effect of Annealing Temperature on Prepared Nanoparticles Li-Ferrite Using Positron Annihilation Lifetime Technique

Abstract

Lithium ferrite nanoparticles were synthesized by a sol-gel auto-combustion method. For prepared samples, the nanograins were increased with increasing the annealing temperature. Positron annihilation lifetime spectroscopy (PALS) was used to study defects at different sites for nanograins Li-ferrites. The analysis of the PAL spectrum indicated two lifetime components τ 1 and τ 2 for the annihilation of the positrons, and their corresponding relative intensities I 1 % and I 2 %. For nanoparticles Li-ferrite there are correlations between: 1) I 2 , τ 2 , annealing temperature and the total porosity (Pt) with the grain size; 2) I 1 , μ i , M s and the homogeneity with grain size.