B, B-C and B-N compounds at high pressures and hig temperatures

该项目的总体科学目标是：（1）在“原位”高压高温实验中研究新的HPHT硼的稳定性场：（2）使用金刚石对顶砧单元和大体积多顶砧装置合成新的HPHT硼-碳和硼-氮化合物;（3）研究它们的物理化学、结构、弹性和键合性质、状态方程和热稳定性以及电学和电子性质;（4）验证了有关理论预测的化合物中C或N组分增加所引起的结构变化。 在拟议的研究中，在B-C和B-N系统的新相的形成将系统地检查在宽的压力和温度范围内使用激光加热的金刚石砧室（高达50 GPa和3000 K），大容量的高P-T装置（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。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 stability field of the new HPHT boron in ´in situ´ high-pressure high-temperature experiments; (2) to synthesize new HPHT boron-carbon and boron-nitrogen compounds using diamond anvil cells and a large-volume multi-anvil apparatus; (3) to study their physical-chemical, structural, elastic and bonding properties, equations of state and thermal stability, as well as electrical and electronic properties; and (4) , to verify relevant theoretical predictions on structural changes associated with the increase of C or N component in these compounds. In the proposed research, the formation of new phases in the B–C and B-N systems 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.