中文摘要：

采用水热法和后续热处理合成出单斜相LaPO4以及LaPO4：Dy3＋，通过XRD对样品进行物相分析，结果表明：所得样品为LaPO4，且XRD图谱及拉曼光谱中峰位的偏移表明Dy的存在，即Dy被掺杂到LaPO4基质中。通过研究用Dy对LaPO4进行不同量掺杂后其拉曼光谱的变化规律，进而找出用Dy对LaPO4进行不同量掺杂后其内部结构的变化规律。结果显示，用Dy对LaPO4进行不同量掺杂后，随着掺杂比例的增大，晶格畸变程度先上升后下降，且在镧镝物质的量比例为1：0．06时对基体晶格结构影响最大。

英文摘要：

The monazite LaPQ were successfully phase LaPO4 and Dy-doped synthesized by hydrothermal method and subsequent heat-treatment. The prepared powders were characterized by X-ray diffraction （XRD） , and Raman spectroscopy. The XRD results showed that the sample is LaPO4. And the shift of XRD peak position indicated the existence of Dy, that is to say Dy has been doped into the LaPO4 matrix. The Raman spectra variation of lanthanide orthophos- phate doped with different concentrations of Dy3＋ wasinvestigated, which nal structure. The reflected the c result revealed hanges of the inter- doping ratio rises, and when the doping ratio that the lattice de- O. 06, the influence for matrix lattice structure formation increases at first and then decreases as the biggest. is 1： is the