Pr、W共掺杂钼酸镧的合成及其导电性

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田立朋，任志华

（青岛科技大学化学与分子工程学院，山东青岛266042）

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。

关键词:钼酸镧； 掺杂； 电导率； 固相反应

中图分类号：TM  271文献标志码：A

引用格式：田立朋，任志华. Pr、W共掺杂钼酸镧的合成及其导电性\[J\].青岛科技大学学报（自然科学版），2017，38（3）：52-56.

TIAN Lipeng, REN Zhihua. Synthesis and electrical properties of Pr, W-doped lanthanum molybdate\[J\]. Journal of Qingdao University of Science and Technology（Natural Science Edition),2017,38(3)：52-56.

Synthesis and Electrical Properties of Pr, W-doped Lanthanum Molybdate

TIAN Lipeng, REN Zhihua

(College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract:  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.

Key words: lanthanum molybdate； doped； conductivity； solid state reaction

收稿日期：2015-12-15

 基金项目：国家自然科学基金资助项目(51174123)；山东省自然科学基金资助项目(ZR2009FL008).

作者简介：田立朋（1973—），男，讲师，博士.

文章编号：16726987（2017）03005205； DOI： 10.16351/j.1672-6987.2017.03.010