High-Pressure Synthesis of Novel Binary and Ternary Superhard Phases in the Si-C-N System

本项目的科学目标是：（1）在高温高压条件下合成Si-C-N系新型二元和三元超硬相。(2)研究它们的物理化学，结构和键合性质，状态方程和相稳定性，以及机械和电子性质在拟议的研究中，将在极端条件下系统地研究Si <$C <$N三元体系中新型二元和三元超硬相的形成。为了达到高达50 GPa和2000 °C的宽压力和温度范围，我们将使用激光加热金刚石对顶砧单元（LH-DAC）。样品的结构和性能将通过同步辐射、IR和拉曼光谱原位分析，并通过粉末X射线衍射、IR和拉曼光谱、透射电子显微镜和电子能量损失光谱非原位分析。此外，通过所提出的项目中的每一个步骤，理论计算可以支持实验开发。

The scientific goals of the project are:(1) Synthesis of novel binary and ternary superhard phases in the Si-C-N system at high pressures and high temperatures. (2) Study of their physico-chemical, structural and bonding properties, the equations of state and phase stability, as well as mechanical and electronic properties In the proposed research, the formation of novel binary and ternary superhard phases in the Si¿ C¿N ternary system will be systematically examined under extreme conditions. In order to reach wide pressure and temperature ranges up to 50 GPa and 2000 °C we will use a laser heated diamond anvil cell (LH-DAC). The structures and properties of the samples will be analyzed in situ by synchrotron radiation, IR- and Raman spectroscopy and ex situ by powder X-ray diffraction, IR- and Raman spectroscopy, transmission electron microscopy and electron energy- loss spectroscopy. Moreover, by each step in the proposed project the theoretical calculations can support the experimental development.