中文摘要：

采用固相反应法合成了Pr、W共掺杂钼酸镧La2-xPrxMo1.7W0.3O9（x=0~1.0）。采用X-射线衍射（XRD）表征了合成产物的相组成。TG-DSC和膨胀率测试结果表明,Pr、W共掺杂对β-La2Mo2O9结构起到了稳定作用。使用交流阻抗法测定了400~800℃温度区间的电导率,结果表明Pr、W共掺杂使电导率增大。扫描电子显微镜（SEM）观测烧结试样的微观结构表明：Pr、W的共掺杂有利于样品的烧结,能提高样品的烧结密度。

英文摘要：

Lanthanum molybdate doped with Pr and W （La2-xPrxMo1.7W0.3O9, x=0-1.0） was synthesized by method of the solid state reaction.The phase formation of the products was characterized by X-ray diffraction（XRD）.The TG-DSC and expansion measurements showed that the phase change of α-La2Mo2O9 to β-La2Mo2O9 can be suppressed by the Pr, W doping.The electrical conductivity of the sintered samples were investigated with the complex impedance spectroscopy measurements in the range of temperature from 400 to 800 ℃.The results showed that the conductivity increased with the Pr, W doping.The examination of microstructure of samples by scanning electron microscopy（SEM） implied that the sintered density also can be improved by the Pr, W doping.