Glass-ceramic sealants for SOFC-based systems

authors	Kharton, VV; Tsipis, EV; Carvalho, AP; Kovalevsky, AV; Naumovich, EN; Marques, FMB; Frade, JR; Shaula, AL
editors	Sammes, N; Smirnova, A; Vasylyev, O
nationality	International
journal	Fuel Cell Technologies: State and Perspectives
author keywords	sealant; glass-ceramics; thermal expansion; solid oxide electrolyte; transport properties
abstract	The studies of electrochemical, physicochemical and mechanical properties of glass-ceramic sealants, based on SiO2-Al2O3-CaO-BaO and SiO2-MgO-BaO systems, showed sufficient stability in contact with zirconia, lanthanum gallate and ceria solid electrolytes at temperatures below 1100-1150 K. Thermal expansion of glass-ceramics can be optimized, to a considerable extent, by adding submicron powders of yttria-stabilized zirconia (YSZ). Excessive YSZ additions result, however, in increasing ionic contribution to the total conductivity, which is predominantly electronic. For moderately doped sealants, the conductivity is essentially composition-independent and varies in the range (2-7)x 10(-7) S/cm at 1123 K.
publisher	SPRINGER
isbn	1-4020-3496-2
year published	2005
volume	202
beginning page	231
ending page	238
web of science category	Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary; Materials Science, Characterization & Testing
subject category	Electrochemistry; Energy & Fuels; Materials Science
unique article identifier	WOS:000235157200024