基于XPS和XAFS技术的掺质磷酸钛氧铷晶体的微观结构及其与性能关系的研究

磷酸钛氧铷（RbTiOPO4, 简称RTP）晶体是一种综合性能优良的非线性光学晶体材料，向RTP晶体中掺入异质离子有望改善晶体的性能，拓宽其应用范围。本项目拟选择Sb5+、Ta5+单掺及Sb5+/Yb3+、Ta5+/Yb3+ 双掺杂的RTP晶体为研究对象，采用X射线光电子能谱（XPS）、同步辐射X射线吸收精细结构谱（XAFS）等技术手段，研究掺质及生长技术等因素引起的RTP晶体微观结构（如阳离子分布、晶胞参数、金属-氧键合情况、TiO6八面体扭曲程度及电子结构）的变化及相关机理；以及掺质引起的晶体非线性光学效应、发光等性能的改变，揭示该类晶体材料微观结构与光学性能之间的内在关系及其规律。通过本项目研究，可为优化晶体性能、探索有应用前景的掺质RTP光学晶体提供理论基础依据。

Rubidium titanyl phosphate (RbTiOPO4, abbreviated as RTP) crystal is an excellent nonlinear optical crystal material. It is expected to improve the properties of crystal and broaden its application fields by doping some ions into RTP crystal. In this project, the crystal materials RbTiOPO4 doped with Sb5+, Ta5+ or Sb5+ /Yb3+, Ta5+ /Yb3+ are selected as research object. The change of the microstructure of RTP crystal (such as cation distribution, lattice parameters, metal-oxygen bond, distortion degree of TiO6 octahedra and electronic structure) caused by doping and growth technology and the related mechnaism will be investigated by using X-ray photoelection spectroscopy (XPS) and synchrotron radiation X-ray absorption fine structure spectroscopy (XAFS). The nonlinear optical effect and luminescence properties of the crystal influenced by doping will be also studied. The inherent relationship between the microstructure and property is revealed. It can provide theoretical basis for optimization of crystal properties and exploring the doped RTP optical crystals possessing application value through this project research.