富氢化合物在高压下具有丰富的晶体结构和电子结构，是物理学、材料科学及超导界共同关注的前沿方向。最近，科研人员利用高温高压技术制备出新型的镧氢化物LaH10，发现其超导转变温度在180万大气压下可达260K，这刷新了超导新纪录，离室温超导的梦想更进一步。本项目拟在多年高压研究基础上，选取典型的镧系稀土金属与多种氢源在不同合成条件下制备新型富氢化物；利用原位同步辐射X射线衍射技术结合第一性原理计算方法研究新型富氢化物的晶体结构与化学计量比；采用原位电阻测量技术进行重要的零电阻测量，获得超导转变温度，进一步探索外加磁场条件下的超导临界磁场。结合理论计算，进一步建立晶体结构-超导电性-电子结构三者之间的构效关系，揭示调制超导电性的关键因素。通过本项目的实施，有望获得新型超导富氢化合物，深化对富氢体系中超导电性的认识和理解，还将为金属氢和室温超导体等方面的研究提供新途径和重要数据。

Hydrogen-rich compounds exhibit abundant crystal structure and electronic structure under high pressure. They are the forefront of physics, materials science and superconductivity. Recently, researchers have synthesized stable lanthanum hydride LaH10 with peculiar hydrogen cage structure by using in-situ high pressure laser heating technology. LaH10 was found to demonstrate high-temperature superconductivity with Tc up to 260 K at 180 GPa. In this project, based on our high pressure research for many years, we will choose typical La-group rare earth metal hydrides as the research object, and typical lanthanide rare earth metals and various hydrogen sources are used to prepare new hydrogen-rich compounds at different conditions. The crystal structure and stoichiometric ratio of new lanthanide rare earth metal hydrogen-rich compounds were studied by in-situ synchrotron radiation X-ray diffraction combined with first-principles calculation method. The important zero resistance superconducting measurement is carried out to obtain the superconducting transition temperature and the superconducting critical magnetic field under external magnetic field is further explored by using in situ high-pressure resistance measurements. Based on the theoretical calculation, the relationship among crystal structure, superconductivity and electronic structure is further established to reveal the critical factors of superconductivity. Through the implementation of this project, it is expected to obtain new superconducting hydrogen-rich compounds, deepen the understanding of superconductivity in hydrogen-rich systems and provide a new approach and important data for metallic hydrogen and room-temperature superconductors.