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9 O 1?95 (GDC) electrolyte were investigated. L 2 NF91 and LNF64 were synthesised using citrate and modified citrate methods with the calcination temperature of 1000uC for 5 h. The single phased oxides with the average particle sizes of L 2 NF91 and LNF64 ,0?2 mm were obtained. The thermal expansion coefficients of L 2 NF91 and LNF64 were 12?7610 26 and 13?2610 26 K 21 respectively. The mixtures of cathode materials and the electrolytes were heated between 800 and 1200uC to observe the formation of secondary phases at the operation temperatures of solid oxide fuel cell. The X-ray diffraction and scanning electron microscopy-energy dispersive X-ray results indicated that L 2 NF91 and LNF64 had good chemical compatibility with GDC from room temperature up to 900uC. Both L 2 NF91 and LNF64 showed higher conductivities when in contact with GDC electrolyte than with Zr 0?92 Y 0?08 O 1?96 electrolyte.