Sm,Nb co-doped La1.7Sm0.3Mo2-xNbxO9-δ(LSMN,x=0.1～0.6)were prepared by solid state method using lanthanum oxide,samarium oxide and molybdenum oxide as raw materials solid electrolyte.The crystal structure and ionic conductivity of LSMN were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier transform infrared(FT-IR)and electrochemical impedance spectroscopy.The results show that the grain size of LSMN is between 51.6 nm and 199.3 nm.After calcining at 700℃for 8 h,the ultrafine powder with cubic structure can be successfully prepared,and the powder has high sintering activity.After sintering at 1100℃for 10 h,the grains of the sintered body are tightly bound,the grain boundaries are clear,and the relative density is above 96%.The electrical performance analysis shows that the doping of Nd3+ ions can significantly improve the ion conductivity of LSMN;La1.7Sm0.3Mo1.6Nb0.4O8.8 is sintered at 1100℃for 10 h to obtain solid electrolyte,and the maximum ionic conductivity is 3.05×10-2 S·cm-1 at 800℃,its activation energy reaches 1.703 eV.
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