Herein,we demonstrate the synthesis of W and Ba co-doped La2Mo2O9(LBMWO)nanocrystalline powder by a sol-gel process.In all the compositions have general formulae La1.9Ba0.1Mo2-xWxO8.95(x=0-0.40).The crystal structure,...Herein,we demonstrate the synthesis of W and Ba co-doped La2Mo2O9(LBMWO)nanocrystalline powder by a sol-gel process.In all the compositions have general formulae La1.9Ba0.1Mo2-xWxO8.95(x=0-0.40).The crystal structure,microstructure and conductivity of LBMWO were characterized by X-ray diffraction,scanning electron microscopy and electrical impedance spectroscopy.In addition,the thermal and decomposition properties of the LBMWO gel were analyzed by differential scanning calorimetry-thermogravimetric.The results reveal that all LBMWO powders calcined at 700℃have a cubic structure;the average crystallite size is about 48 nm.The unit cell parameter of LBMWO powders increases with increase in W content.The as-synthesized nanocrystalline LBMWO samples exhibit excellent sinterability and a relatively lower sintering temperature of 900℃.A high relative density of-96%is achieved after sintering at 900℃which is in good agreeme nt with the re sults of the SEM.Moreover,W and Ba codoping suppresses the phase transition and effectively stabilizes theβ-phase at low temperature.At the same time,La1.9Ba0.1Mo1.85W0.15O8.95 exhibits high ionic conductivity,3.07 x 10^-2 S/cm at 800℃.It is therefore concluded that co-doping can improve the properties of La2MO2O9 electrolytes.展开更多
基金Project supported by the Natural Science Foundation of Anhui Province of China(1708085ME112)Anhui Province Outstanding Young Teachers Visit Abroad Training Projects(gxfxZD2016220)+2 种基金Key Projects of Natural Science Research in Anhui Universities(KJ2018A0549,KJ2017A533)Major Project of Research and Development fund of Hefei University(17ZR02ZDA)the Graduate Thesis Innovative Foundation of Hefei University(CX201805)
文摘Herein,we demonstrate the synthesis of W and Ba co-doped La2Mo2O9(LBMWO)nanocrystalline powder by a sol-gel process.In all the compositions have general formulae La1.9Ba0.1Mo2-xWxO8.95(x=0-0.40).The crystal structure,microstructure and conductivity of LBMWO were characterized by X-ray diffraction,scanning electron microscopy and electrical impedance spectroscopy.In addition,the thermal and decomposition properties of the LBMWO gel were analyzed by differential scanning calorimetry-thermogravimetric.The results reveal that all LBMWO powders calcined at 700℃have a cubic structure;the average crystallite size is about 48 nm.The unit cell parameter of LBMWO powders increases with increase in W content.The as-synthesized nanocrystalline LBMWO samples exhibit excellent sinterability and a relatively lower sintering temperature of 900℃.A high relative density of-96%is achieved after sintering at 900℃which is in good agreeme nt with the re sults of the SEM.Moreover,W and Ba codoping suppresses the phase transition and effectively stabilizes theβ-phase at low temperature.At the same time,La1.9Ba0.1Mo1.85W0.15O8.95 exhibits high ionic conductivity,3.07 x 10^-2 S/cm at 800℃.It is therefore concluded that co-doping can improve the properties of La2MO2O9 electrolytes.
