Abstract
The lithium ferrite (LiFe5O8) is a very interesting ferromagnetic
material due to its square hysteresis loop and high Curie temperature.
It has attracted the attention of scientists and engineers for a long
time with regard to their application as a low-cost substitute of garnet
ferrites in several devices. In this work we present the first studies
of the (x)SiO2-(1-x)Li2O.5Fe(2)O(3) (% mol) glass and glass-ceramic, with x = 94 and x = 97%, prepared by the sol-gel method.
The influence of the heat-treatment parameters, in the glass and
glass-ceramics structure prepared was investigated by X-ray diffraction
(XRD), scanning electron microscopy (SEM) and impedance spectroscopy
measurements. The increase of the volume ratio between the LiFe5O8
particles and the glass matrix leads to an increase of the conductivity.
The dielectric measurements show that the crystalline growth orientation
of the LiFe5O8 particles, embedded in the glass matrix, is random. (c)
2010 Elsevier B.V. All rights reserved.
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