EDTA-甘氨酸联合法制备LaAlO_3基电解质材料及其电性能

Synthesis and Electrical Properties of LaAlO_3-Based Electrolyte Material via EDTA-Glycine Combined Process

采用EDTA-甘氨酸联合法(EGCP)合成具有钙钛矿结构的La0.90Sr0.10Al0.97Mg0.03O3-δ(LSAM)粉体。采用TG-DSC,XRD,ICP-OES和TEM对粉体进行表征。在750℃下,无定形结构的粉末直接转化为钙钛矿结构的LSAM粉体。经1000℃煅烧3 h后的粉体,团聚程度低,粒径分布均匀,平均粒径约为77 nm,具有良好的烧结性能。通过SEM对材料的显微结构进行观察并分析其对电性能的影响。采用直流四电极法在空气中测定材料的总电导率,在800℃时,EGCP合成的LSAM电解质的总电导率为1.50×10-2S.cm-1,比固相法的高47.1%。

The perovskite-type La0.90Sr0.10Al0.97Mg0.03O3-δ（LSAM） powders was synthesized via EDTA-glycine combined process（EGCP）.The precursor powders and calcined powders were characterized by TG-DSC,XRD,ICP-OES and TEM.The perovskite-type LSAM powder could be synthesized at 750 ℃,which was directly converted from amorphous precursor powders.After calcined at 1000 ℃ for 3 h,the uniform particle size distribution and low degree of agglomeration for powders were obtained by EGCP.The average particle size of powders measured by TEM technique was about 77 nm.The LSAM powders that synthesized by EGCP showed excellent sinterability.The microstructure of material was observed by SEM and effect on the electrical conductivity was analyzed also.The total conductivities of the specimens were measured using the four-probe D.C.method in air.The conductivity of LSAM electrolyte prepared by EGCP was about 1.50×10-2 S·cm-1 at 800 ℃,which was 47.1% higher than that synthesized by solid state synthesis route.