Abstract
Non-conducting BaO-B2O3 -Al2O3 -SiO2 parent glasses designed for solid oxide fuel cell (SOFC) sealing applications were prepared using the melt-quenching technique. The glass formation region was determined according to phase equilibrium relations and was found to be in the composition range 70BaO-(x) Al2O3 -(10−x) B2O3 -20SiO2 where 3.0 < x < 6.0 wt.%. The conductivity values obtained conductivity ranged from 10 −5 to 10 −10 S/cm at temperatures between 600 and 850 °C. The batch compositions presented a threshold of dc conductivity near 70BaO wt% with a quasi linear behavior with the decrease of the BaO content. Different values of conduction activation energy were observed at temperatures above the glass transition temperature (T g ) (up to 700 °C), which were attributed to the thermal bond-breaking of non-bridging oxygen (NBO) defects. The experimental results of the electrochemical characterization by impedance spectroscopy of glass–ceramic interfaces with yttria-stabilized zirconia (YSZ) acting as solid ionic conductor electrolyte are presented and discussed.
Recommended Citation
M. J. Da Silva et al., "Ionic Conductivity Behavior by Activated Hopping Conductivity (Ahc) of Barium Aluminoborosilicate Glass–ceramic System Designed for Sofc Sealing," Journal of the European Ceramic Society, vol. 39, no. 10, pp. 3103 - 3111, Elsevier, Aug 2019.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2019.03.027
Department(s)
Materials Science and Engineering
Keywords and Phrases
Activated hopping conduction; Glass–ceramics; Impedance spectroscopy; Phase separation; Sealants; SOFC
International Standard Serial Number (ISSN)
1873-619X; 0955-2219
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Elsevier, All rights reserved.
Publication Date
01 Aug 2019
Comments
Conselho Nacional de Desenvolvimento Científico e Tecnológico, Grant 233658/2014-9