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Novel composite materials based on La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) and a binary eutectic carbonates (52 mol% Li2CO3:48 mol% Na2CO3) are potential electrolytes for low-temperature solid oxide fuel cells (LTSOFCs) operating at 400-600 ℃.However,thermal stability of the LSGM- (Li/Na)2CO3 composites remains in doubt due to the molten state of the carbonates at elevated temperature.