本项目拟深入系统地研究Se-C(硒-碳)、Te-C（碲-碳）体系在高温高压下合成金刚石的行为规律及其触媒作用机理。内容包括：在宽广的压力温度幅度下，研究两体系金刚石晶体成核与生长的特征及其与合成时间的关系，确定它们在碳元素高压相图上的分布规律；弄清楚样品组合方式及添加比例对晶体自发成核和生长的影响，获得最优化的金刚石晶体生长环境条件；检测分析用Se、Te作触媒合成的金刚石在结构、形貌、成分和物理性能方面的特征和差异；探索利用温度差法对放置的金刚石晶种进行生长大颗粒单晶（≥2mm）的实验；深入系统分析Se-C、Te-C体系高温高压下石墨向金刚石相变的动力学及触媒作用机理。本研究利用无机非金属触媒Se、Te合成的金刚石是一种应用价值极为广泛的极限功能材料，大量实验数据与理论分析将加深理解氧族元素在合成金刚石过程中的触媒作用机理，在人造金刚石的科学技术发展中具有极为重要研究价值和学术意义。

In this project, the behavior rules and mechanism of diamond synthesis would be systematically researched in the systems of selenium-carbon and Tellurium-carbon under high pressure and high temperature (HPHT) conditions. It includes: research on spontaneous nucleation and growth characteristics of diamond crystal under a much wider range of pressure and temperature as well as its relationship with hold time, determine the distribution in the high pressure phase diagram of carbon; clarify the effection of sample assembly type and adding proportion on spontaneous nucleation and growth, obtain the optimal environmental conditions of the diamond synthesis; detect and analyze the characteristics and differences of diamond crystal in structure, morphology ,composition and physical properties using Se and Te as catalyst; explore the growth of diamond seed crystal to synthesis of large single crystal (≥2mm) by the temperature gradient method; analyze in depth the kinetics and catalytic mechanism of graphite-diamond phase transition in Se-C and Te-C systems under HPHT conditions. In this study, the synthetic diamond used inorganic non-metallic catalyst of Se and Te is an ultimate functional material with extremely wide application, a large number of experimental data and theoretical analysis would deepen our understanding of catalyst mechanism for diamond synthesis using elements of the oxygen group as catalyst, it is of great academic significance in the development of artificial diamond science and technology.