B-C-N化合物新相的冲击波合成

Shock Synthesis of a New B-C-N Compound

理论预言,B-C-N化合物可能存在多种结构,并具有优良的物理性能,因此其合成研究引起了各国学者的关注。运用二级轻气炮冲击加载与样品回收技术,在40GPa压力附近探索了B-C-N化合物的新相合成条件。X射线衍射、高分辨率透射电镜、电子衍射、X射线光电子能谱等检测技术的分析结果表明,3种不同原子比例的B-C-N前驱物在40GPa的强冲击合成条件下,均能生成一种新的B-C-N致密新相单晶体,尺寸约为60nm。具有这种结构的B-C-N化合物在文献中未见报道。研究结果对进一步探索B-C-N新相的结构形态及其高温高压合成条件具有参考意义,也为理论工作者提供了一种新的B-C-N结构模型。

Theory predicts that B-C-N compounds may exist in many structural forms and have excel-lent physical properties. Synthesis of such materials is attracting the attentions of scientists. A two-stage light-gas gun and the corresponding shock-recovery technology were applied to explore the syn-thesis conditions of B-C-N compound of new phase structures under 40 GPa pressure. XRD （X-ray dif-fraction）, HRTEM （high-resolution transmission electron microscopy）, ED （electron diffraction） and XPS （X-ray photoelectron spectroscopy） analysis show that all three precursors with different atomic ratio of B,C and N can generate a new dense phase of B-C-N compound under strong shock loading of 40 GPa. Single crystals of 60 nm are directly observed in the recovery sample. The new B-C-N com-pound of such structure has not been reported in the literature before. Therefore, this discovery is of significance for exploring new structures of B-C-N compounds and the synthesis conditions in future; meanwhile,a new structure of B-C-N compound is waiting to be studied by theoretical researchers.