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.

Department(s)

Materials Science and Engineering

Comments

Conselho Nacional de Desenvolvimento Científico e Tecnológico, Grant 233658/2014-9

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

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