TITLE:
Effect of Annealing Temperature on Prepared Nanoparticles Li-Ferrite Using Positron Annihilation Lifetime Technique
AUTHORS:
A. M. Samy, E. Hassan Aly
KEYWORDS:
Nano Li-Ferrite, Porosity, Positron Annihilation, Initial Permeability, Magnetization
JOURNAL NAME:
Materials Sciences and Applications,
Vol.6 No.5,
May
22,
2015
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 τ1 and τ2 for the annihilation of the positrons, and their corresponding relative intensities I1% and I2%. For
nanoparticles Li-ferrite there are correlations between: 1) I2, τ2, annealing temperature and the
total porosity (Pt) with the grain size; 2) I1, μi, Ms and the homogeneity with grain size.