Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 352, Issue 9-20, Pages 1501-1505Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2006.01.084
Keywords
crystallization; ceramics; dielectric properties; relaxation; electric modulus; ferroelectric; nano-composites; oxide glasses; alkali silicates; silicates; sol-gels (xerogels)
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Glass with composition 88SiO(2-6)Li(2)O-6Nb(2)O(5) (mol%) was successfully prepared by the sol-gel technique. The dried and translucent get was heat-treated at temperatures between 500 degrees C and 800 degrees C. Lithium niobate crystallites, an important ferroelectric material, were detected in the gel derived glass-ceramics heat-treated above 650 degrees C. The de electrical conductivity (sigma(dc)) temperature dependence shows two regions with different activation energies. The dielectric constant decreases with an increase in the treatment temperature. The Z'' frequency dependence shows two relaxation peaks, one at frequencies > 1 kHz and another at low frequencies. The mean value of the relaxation times shifts to higher frequencies with an increase in measurement temperature. These dielectric behavior was an R-0(R1CPE1)(R2CPE2) equivalent circuit, using a complex non-linear least squares algorithm. The electrical and dielectrical behavior, of the glass materials, shows the important role of the treatment temperature on the gel-glass structure. (c) 2006 Elsevier B.V. All rights reserved.
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