Preparation and properties of Y, Mn-doped LMO solid electrolyte for IT-SOFCs

La 2 Mo 2 O 9 doped with cheap metal cations can further increase their conductivity. The transition metal element Mn and the rare-earth element Y co-doped La 2 Mo 2 O 9 -based electrolyte was used, and the sintered ceramic body La[Formula: see text]Y[Formula: see text]Mo [Formula: see text][Formula: see text]Mn[Formula: see text]O [Formula: see text][Formula: see text]([Formula: see text]= 0[Formula: see text]0.4) was prepared by the sol-gel method, sintering at 950°C. The results show that the samples can suppress the phase transition and retain the [Formula: see text]-phase of the structure of La 2 Mo 2 O 9 , due to doping, and it is a single pure phase, which has good sintering performance. Among them, La[Formula: see text]Y [Formula: see text]Mo[Formula: see text]Mn[Formula: see text]O[Formula: see text] reached the maximum ionic conductivity of 0.0292 S⋅cm[Formula: see text] at 800°C, and Ea is 0.425 eV, which can become a solid electrolyte material of IT-SOFC.