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

该项目的科学目标是：(1)在高压和高温下在Si-C-N系统中合成新型的二元和三元超硬相。(2)它们的物理化学、结构和成键性质的研究，状态方程和相稳定性，以及力学和电子性质。在所提出的研究中，将在极端条件下系统地研究在Si？C？N三元系统中新的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的钻石顶压室(LHDAC)。用同步辐射、红外光谱和拉曼光谱对样品的结构和性能进行了原位分析，用粉末X射线衍射、红外光谱和拉曼光谱、透射电子显微镜和电子能量损失谱对样品进行了非原位分析。此外，通过所提出的项目中的每一步，理论计算都可以支持实验的发展。

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.