Synthesis and in-situ characterization of boron-doped superhard nanodiamond materials

该项目的总体科学目标是：（1）在高压高温下原位合成纳米晶和掺硼金刚石的途径;（2）利用金刚石对顶砧和大体积多顶砧装置合成新型掺硼纳米金刚石材料;（3）研究其物理化学、结构、弹性和结合性能。状态方程和热稳定性，以及电气和电子性能。在拟议的研究中，将使用激光加热金刚石砧室（高达50 GPa和3000 K），大容量高P <$T设备（高达25 GPa和2500 K）和X射线衍射与内部和同步辐射，以及拉曼光谱在宽的压力和温度范围内系统地检查B <$C系统中新型超硬类金刚石相的形成。通过粉末X射线衍射、拉曼光谱、电子显微镜、电子能量损失谱、硬度测量和电输运性质测量来分析淬火样品的结构和性质。

The overall scientific goals of the project are: (1) to investigate the path of formation of nanocrystalline and boron-doped diamonds in ´in situ´ high-pressure high-temperature experiments, (2) to synthesize a new boron-doped nanodiamond materials using diamond anvil cells and a large-volume multi-anvil apparatus, and (3) to study their physical-chemical, structural, elastic and bonding properties, equations of state and thermal stability, as well as electrical and electronic properties. In the proposed research, the formation of novel superhard diamond-like phases in the B¿C system will be systematically examined over wide pressure and temperature ranges using a laser heated diamond anvil cell (up to 50 GPa and 3000 K), a large-volume high P¿T apparatus (up to 25 GPa and 2500 K) and X-ray diffraction with in house and synchrotron radiation, as well as Raman spectroscopy. The structure and properties of quenched samples will be analyzed by powder X-ray diffraction, Raman spectroscopy, electron microscopy, electron energy loss spectroscopy, hardness measurements, and electrical transport properties measurements.