富氢化合物的压致金属化和超导电性是实现金属氢和高温超导体的有效途径，已经成为物理学、材料科学等多学科的热点领域之一。最近实验和理论上均发现了硫氢化物在高压下的超导临界温度达到190 K，打破了此前铜基超导体164 K的温度纪录，进一步激发了人们对硫族氢化物高压行为的研究热潮。目前，硫族氢化物的高压研究存在着亟待解决的关键科学问题：(1)高压下新型硫族氢化物的合成及稳定晶体结构；(2)超高压下新型硫族氢化物的金属化条件及超导电性。本项目选取硫族氢化物为研究对象，采用原位高压实验测量结合第一性原理计算，探索新型硫族氢化物在高压下的合成条件及稳定晶体结构，确定压致金属化条件及奇异的超导电性。通过本项目的实施，可以揭示超高压下新型硫族氢化物中氢以及非氢元素和化学计量比等因素与微观结构、超导电性之间的内在联系，为金属氢、高温超导材料等相关研究提供新的途径和重要的实验数据。

Pressure induced metallization and superconductivity in hydrogen-rich compounds is an effective way to realize high temperature superconductors of metallic hydrogen, and has become one of the hot topics in the field of physics, material science, etc. Recently, both experimental and theoretical results have found that sulfur hydrides become superconductor with Tc=190 K under high pressure, breaking the temperature record of copper based superconductors with Tc= 164 K. These researches further stimulate the studies of chalcogen hydrides under pressure. There are several unsolved questions of chalcogen hydrides: (1) the synthesis and stable crystal structure of new chalcogen hydrides under high pressure; (2) pressure-induced metallization and novel superconductivity of chalcogen hydrides. This project aims to study the typical chalcogen hydrides, explore the structure of new chalcogen hydrides and measure the superconductivity of new chalcogen hydrides under high pressures, using in situ high-pressure experimental measurement combined with first principles calculations. The implementation of the project will reveal the inherent relation among hydrogen and non-hydrogen elements, the stoichiometric ratio, the microscopic structure, and superconductivity, and provide a new route to study metal hydrogen and high temperature superconductors.