Abstract
The electrical and dielectrical properties of the glass and
glass-ceramics with the 60SiO(2)-30Li(2)O-10Nb(2)O(5) (mole%)
composition, containing LiNbO3 crystallites, were studied. The dc
electric conductivity (sigma(dc)) and de activation energy (E-a(dc))
decreases with the rise of the heat-treatment (HT) temperature and with
the increase of the amplitude of the applied electric field. The highest
dielectric constant, 48.19, was observed in the 650HT sample. The
dielectrical properties were discussed through a three serial capacitor
model, two related with the sample surfaces and one with the bulk
material, showing that the bulk has the major contribution for the
dielectrical characteristics. A resistance in parallel with a constant
phase element (CPE) is the best equivalent circuit that describes the
dielectrical behavior. The obtained results reflect the important role
carried out by the treatment temperature and the applied electric field
in the electrical and dielectrical properties of the glass. (c) 2006
Elsevier B.V. All rights reserved.
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