CAJ | 학술논문

采用固相反应法成功制备了(La1－x Ndx )5．5 WO12－δ(x＝1/3,1/2)质子-电子混合导体.运用 X射线衍射仪(XRD)、扫描电子显微镜(SEM)分别对试样的物相结构、微观形貌进行了表征.测试了试样在湿润CO2气氛中的化学稳定性,应用交流阻抗法测定了其在空气和湿润5％ H 2/Ar 气氛中的电导率,并研究了试样在不同温度、不同氢分压下的透氢量.结果表明,(La1－xNdx)5．5 WO12－δ(x＝1/3,1/2)经1550℃烧结后均形成立方萤石结构的致密烧结体；试样在800℃湿润CO2气氛中均表现出良好的化学稳定性；试样在湿润5％ H 2/Ar 气氛下的电导率明显高于空气气氛,在湿润5％ H2/Ar 气氛中850℃时,(La1/2 Nd1/2)5．5 WO12－δ的电导率达到6．58×10－3 S/cm；在900℃、50％ H2/N2时,厚度为1．56 mm 的(La1/2 Nd1/2)5．5 WO12－δ透氢膜获得最大透氢量为0．079 mL/(min?cm2).
채용고상반응법성공제비료(La1－x Ndx )5．5 WO12－δ(x＝1/3,1/2)질자-전자혼합도체.운용 X사선연사의(XRD)、소묘전자현미경(SEM)분별대시양적물상결구、미관형모진행료표정.측시료시양재습윤CO2기분중적화학은정성,응용교류조항법측정료기재공기화습윤5％ H 2/Ar 기분중적전도솔,병연구료시양재불동온도、불동경분압하적투경량.결과표명,(La1－xNdx)5．5 WO12－δ(x＝1/3,1/2)경1550℃소결후균형성립방형석결구적치밀소결체；시양재800℃습윤CO2기분중균표현출량호적화학은정성；시양재습윤5％ H 2/Ar 기분하적전도솔명현고우공기기분,재습윤5％ H2/Ar 기분중850℃시,(La1/2 Nd1/2)5．5 WO12－δ적전도솔체도6．58×10－3 S/cm；재900℃、50％ H2/N2시,후도위1．56 mm 적(La1/2 Nd1/2)5．5 WO12－δ투경막획득최대투경량위0．079 mL/(min?cm2).
Mixed proton-electron conductors of (La1-xNdx)5.5 WO12-δ(x=1/3,1/2)were successfully synthe-sized by the solid state reaction route.The phase composition and microstructures of the samples were investiga-ted by XRD and SEM,respectively.Chemical stability against humid CO2 was tested.The total conductivities of the samples in air and wet 5% H2/Ar atmospheres were measured by the AC impedance spectroscopy.Hydro-gen permeation performance of the membranes was tested at different temperatures and hydrogen partial pres-sures.The results indicate that the samples sintered at 1 550 ℃ were cubic fluorite structure and the samples were extremely dense.The samples are quite stable in humid CO2 atmosphere.The samples have higher conduc-tivities in wet 5% H2/Ar and (La1/2 Nd1/2 )5.5 WO12-δpresents a high conductivity in wet 5% H2/Ar,which was about 6.58×10-3 S/cm at 850 ℃.Using 50% H2/N2 as feed gas,the highest hydrogen flux for (La1/2 Nd1/2 )5.5 WO12-δmembrane with thickness of 1.56 mm was 0.079 mL/(min??cm2)at 900 ℃.