六角相硼碳氮化合物的合成研究

 以三聚氰胺和氧化硼为原料，利用真空热处理和高温高压技术，对BCN化合物的形成及结构进行了研究。在真空条件下，原料经1 100 K热处理得到非晶BCN的前驱物，将前驱物在5.0 GPa、1 500 K条件下高温高压热处理30 min，合成出了单相的六角BCN晶体。采用Materials Studio软件的Reflex模块对样品的X射线衍射图谱进行分析，结果表明，得到的样品为纯的六角相，晶格常数为a=0.250 5 nm，c=0.665 9 nm。对样品进行了透射电镜（TEM）分析，得到了样品的形貌和电子衍射，同样证实了样品为六角BCN晶体，晶粒尺寸约200 nm。对样品进行了XPS表征，确定了样品中存在C—C、C—N、C—B、N—B键，表明B、C、N三元素之间达到了原子级化合，样品的组分含量通过EDX进行标定。

Synthesis and Characterization of h-BCN Nanocrystallite under High-Pressure and High-Temperature

h-BCN compounds were synthesized with C₃H₆N₆ and B₂O₃ as raw materials, combined with heat treatment, high pressure and high temperature. An amorphous BCN precursor was prepared at 1 100 K under vacuum. Annealed for 30 min, at 1 500 K under 5.0 GPa, the amorphous BCN precursor crystallizes into hexagonal BCN compound with lattice constants of a=0.250 5 nm, c=0.665 9 nm determined by using the reflex module combined in the Materials Studio program analysis. The shape and SAD of sample also approved that the sample was h-BCN crystal by TEM analysis. The grain size about was 200 nm. XPS analysis was applied for the sample. The results confirmed bending energy of C—C, C—N, C—B, N—B. It indicated atom level chemical combination of BCN. The composition and content of the sample were analyzed by EDX.