Numéro
J. Phys. IV France
Volume 07, Numéro C1, Mars 1997
7th INTERNATIONAL CONFERENCE ON FERRITES
Page(s) C1-553 - C1-554
DOI https://doi.org/10.1051/jp4:19971228
7th INTERNATIONAL CONFERENCE ON FERRITES

J. Phys. IV France 07 (1997) C1-553-C1-554

DOI: 10.1051/jp4:19971228

Lithium Ferrite Nanocrystals Embedded in a non-Magnetic Glass Matrix

E. Rezlescu, N. Rezlescu and M.L. Craus

Institute of Technical Physics, Bd. Mangeron 47, 6600 Iasi, Romania


Abstract
Nanocrystalline LiFe5O8 particles embedded in an amorphous matrix were obtained by heat treatments of the non-magnetic oxide glass 32Li2O-8FeO3-60B2O3, between 200 and 770°C. The X-ray spectra reveal the formation of the spinel phase of Li-ferrite in the initially amorphous materials only for annealing temperatures higher than 440°C and the hybrid structure becomes more evident with the increase of temperature. The occurrence of the magnetic spinel phase (LiFe5O8) was proved by magnetization and Curie temperature measurements too. The evolution of the magnetic properties of these glass-ceramic compounds in terms of annealing temperature was investigated. The magnetic properties (σs, Hc) are correlated with the average size of the LiFe5O8 nanoparticles dispersed in the glass matrix. The X-ray diffraction data indicated an evident increase in the average crystal block size from 3.5 to 50 nm with the increase of annealing temperature from 440° to 770°C.



© EDP Sciences 1997