中文摘要：

采用直接沉淀法制备PbWO_4有序纳米结构,以草酸根双羧基阴离子为其生长阶段结构导向剂。使用X射线粉末衍射（XRD）、扫描电子显微镜（SEM）、红外光谱（IR）和透射电子显微镜（TEM）等手段对其表征,研究了草酸根离子在PbWO_4纳米晶生长阶段的控制作用,并提出了PbWO_4有序纳米结构的形成机理.

英文摘要：

Ordered PbWO_4 nanostructures were synthesized by a direct precipitation method,and the oxalate anions with double carboxyl were employed as structure-directing agents in the growth stage of PbWO_4 nanocrystals.The PbWO_4 nanostructures were characterized by X-ray power diffraction（XRD）, scanning electron microscopy（SEM）,infra-red spectrum（IR） and transmission electron microscopy（TEM）. The control role of the oxalate anions in the growth stage of PbWO_4 nanocrystals was investigated and formation mechanism of the ordered PDWO_4 nanocrystals was proposed.