Shock Synthesis of a New B-C-N Compound
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摘要: 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40 GPa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40 GPa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60 nm。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。Abstract: Theory predicts that B-C-N compounds may exist in many structural forms and have excellent 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 synthesis conditions of B-C-N compound of new phase structures under 40 GPa pressure.XRD (X-ray diffraction), 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 compound 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.
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Key words:
- B-C-N compounds /
- superhard material /
- shock wave synthesis /
- light gas gun
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表 1 B-C-N冲击合成的前驱物
Table 1. Pyrolysis precursor for shock synthesis of B-C-N
Sample mH3BO3:mC3N6H6 Full width at half maximum/(°) Product color xB:xC:xN Ⅰ 1:2 12.0 Black 28:50:22 Ⅱ 1:1 7.8 Tawny 41:25:34 Ⅲ 2:1 7.5 White 29:53:18 表 2 样品的实验条件和冲击压力
Table 2. Experimental conditions and shock pressure of samples
Sample Initial density/(g/cm3) Impact velocity/(km/s) Shock pressure/(GPa) Shock temperature/(K) Ⅰ 6.68 1.70 40 2 200 Ⅱ 6.59 1.70 40 2 300 Ⅲ 6.43 1.70 40 2 500 -
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