%0 Journal Article %1 WOS:000238782900151 %A Graca, M P F %A da Silva, Ferreira M G %A Sombra, A S B %A Valente, M A %C PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS %D 2006 %I ELSEVIER SCIENCE BV %J JOURNAL OF NON-CRYSTALLINE SOLIDS %K (xerogels)} alkali ceramics; dielectric electric ferroelectric; glasses; modulus; nano-composites; oxide properties; relaxation; silicates; sol-gels {crystallization; %N 9-20 %P 1501-1505 %R 10.1016/j.jnoncrysol.2006.01.084 %T Study of the electric and dielectric properties of SiO2-Li2O-Nb2O5 sol-gel glass-ceramics %V 352 %X 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.

@article{WOS:000238782900151, abstract = {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.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, author = {Graca, M P F and da Silva, Ferreira M G and Sombra, A S B and Valente, M A}, biburl = {https://www.bibsonomy.org/bibtex/20e849c79ebed0c7df113cb1d866c6a15/ppgfis_ufc_br}, doi = {10.1016/j.jnoncrysol.2006.01.084}, interhash = {2b22258665b7fb817d27f9b1553ed726}, intrahash = {0e849c79ebed0c7df113cb1d866c6a15}, issn = {0022-3093}, journal = {JOURNAL OF NON-CRYSTALLINE SOLIDS}, keywords = {(xerogels)} alkali ceramics; dielectric electric ferroelectric; glasses; modulus; nano-composites; oxide properties; relaxation; silicates; sol-gels {crystallization;}, note = {21st International Conference on Amorphous and Nanocrystalline Semiconductors, Lisbon, PORTUGAL, SEP 04-09, 2005}, number = {9-20}, pages = {1501-1505}, publisher = {ELSEVIER SCIENCE BV}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Study of the electric and dielectric properties of SiO2-Li2O-Nb2O5 sol-gel glass-ceramics}, tppubtype = {article}, volume = 352, year = 2006 }