Effect of CaF2 on the sintering and thermal expansion of La0.85Sr0.15Cr0.95O3
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Lanthanum chromite based perovskite have been widely accepted as ceramic interconnects and as protecting layers for metallic interconnects in solid oxide fuel cells (SOFCs) because of thier high electronic conductivity, chemical stability in both oxidizing and reducing atmospheres as well as their chemical and thermo-mechanical compatibility with other cell components under operating conditions [1, 2]. Strontium-doped LaCrO3 has emerged as a primary candidate for SOFC interconnects over other alkaline earth oxides such as CaO and MgO . From the viewpoint of compatibility of thermal expansion among SOFC components, Sr-doped lanthanum chromite can match the coefficient of thermal expansion (CTE) to the Y2O3-stabilized ZrO2 (YSZ) electrolyte using less than 20 mol% Sr .
Lanthanum chromite interconnects must be a dense in order to separate fuel gas from the oxidizing agent. They are usually sintered above 1,600 °C to reach a 94% relative density . From cost considerations...
KeywordsPerovskite Sinter Temperature CaF2 LaF3 LaCrO3