%0 Journal Article %1 WOS:000257349100003 %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 2008 %I ELSEVIER SCIENCE BV %J JOURNAL OF NON-CRYSTALLINE SOLIDS %K conductivity; current}, depolarization dielectric electric modulus; properties, relaxation stimulated; thermally {glass-ceramics; %N 29 %P 3408-3413 %R 10.1016/j.jnoncrysol.2008.03.007 %T The dielectric behavior of a thermoelectric treated B2O3-Li2O-Nb2O5 glass %V 354 %X A transparent glass with the composition 60B(2)O(3)-30Li(2)O-10Nb(2)O(5) (mol%) was prepared by the melt-quenching technique. Glass-ceramics, containing LiNbO3 ferroelectric crystallites, were obtained by heat-treatment (HT) above 500 degrees C, with and without the presence of an external electric field. The dielectric properties of the glass and glass-ceramic were investigated, as a function of temperature (270-315K), in the 10 mHz-32 MHz frequency range. The presence of an external electric field, during the heating process, improves the formation of LiNbO3 crystallites. The rise of the treatment temperature and the applied field, during the heat-treatment, leads to a decrease in the dc electric conductivity (sigma(dc)), indicating a decrease of the charge carriers number. The dielectric permittivity (epsilon') values (300 K; 1 kHz) are between 16.25 and 18.83, with the exception of the 550 degrees C HT sample that presents a epsilon' value of 11.25. An electric equivalent circuit composed by an R in parallel with a CPE element was used to adjust the dielectric data. The results reflect the important role carried out by the heat-treatment and the electric field during the HT in the electric properties of glass-ceramics. (c) 2008 Elsevier B.V. All rights reserved.

@article{WOS:000257349100003, abstract = {A transparent glass with the composition 60B(2)O(3)-30Li(2)O-10Nb(2)O(5) (mol%) was prepared by the melt-quenching technique. Glass-ceramics, containing LiNbO3 ferroelectric crystallites, were obtained by heat-treatment (HT) above 500 degrees C, with and without the presence of an external electric field. The dielectric properties of the glass and glass-ceramic were investigated, as a function of temperature (270-315K), in the 10 mHz-32 MHz frequency range. The presence of an external electric field, during the heating process, improves the formation of LiNbO3 crystallites. The rise of the treatment temperature and the applied field, during the heat-treatment, leads to a decrease in the dc electric conductivity (sigma(dc)), indicating a decrease of the charge carriers number. The dielectric permittivity (epsilon') values (300 K; 1 kHz) are between 16.25 and 18.83, with the exception of the 550 degrees C HT sample that presents a epsilon' value of 11.25. An electric equivalent circuit composed by an R in parallel with a CPE element was used to adjust the dielectric data. The results reflect the important role carried out by the heat-treatment and the electric field during the HT in the electric properties of glass-ceramics. (c) 2008 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/2c6d2b3e6da6f9d9c028bb908b7da6d81/ppgfis_ufc_br}, doi = {10.1016/j.jnoncrysol.2008.03.007}, interhash = {bfd96d03c74d558634ff8cf88eb60432}, intrahash = {c6d2b3e6da6f9d9c028bb908b7da6d81}, issn = {0022-3093}, journal = {JOURNAL OF NON-CRYSTALLINE SOLIDS}, keywords = {conductivity; current}, depolarization dielectric electric modulus; properties, relaxation stimulated; thermally {glass-ceramics;}, number = 29, pages = {3408-3413}, publisher = {ELSEVIER SCIENCE BV}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {The dielectric behavior of a thermoelectric treated B2O3-Li2O-Nb2O5 glass}, tppubtype = {article}, volume = 354, year = 2008 }