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

该项目的总体科学目标是：(1)在高压和高温下在B-C-N体系中合成新的二元和三元超硬类金刚石相；(2)研究其物理化学、结构、弹性和键合性能、状态方程和热稳定性。在提出的研究中，将使用激光加热金刚石砧池（高达50 GPa和3000 K），大型高压装置（高达25 GPa和2300 K）和x射线衍射与内部和同步辐射，在宽压力和温度范围内系统地检查B-C-N体系中新型二元和三元超硬类金刚石相的形成。淬火样品的结构和性能将通过粉末x射线衍射、拉曼和红外光谱、扫描和透射电子显微镜、电子能量损失和能量色散x射线光谱、热分析、纳米压痕和硬度测量进行分析。

The overall scientific goals of the project are: (i) to synthesize new binary and ternary superhard diamond-like phases in the B–C–N system at high pressures and high temperatures, and (ii) to study their physico-chemical, structural, elastic and bonding properties, equations of state and thermal stability. In the proposed research, the formation of novel binary and ternary superhard diamond-like phases in the B–C–N system will be systematically examined over wide pressure and temperature ranges using laser heated diamond anvil cell (up to 50 GPa and 3000 K), largevolume high-pressure apparatus (up to 25 GPa and 2300 K) and X-ray diffraction with in-house and synchrotron radiation. The structure and properties of quenched samples will be analyzed by powder X-ray diffraction, Raman- and IR- spectroscopy, scanning- and transmission electron microscopy, electron energy loss- and energy dispersive X-ray spectroscopy, thermal analysis, nanoindentation and hardness measurements.