人造金刚石单晶铁基金属包膜的精细结构

FINE STRUCTURES OF THE Fe-BASED METAL FILM COVERING SYNTHETIC DIAMOND SINGLE CRYSTAL

利用扫描Auger微探针和X射线光电子能谱等手段,研究了包覆着高温高压金刚石单晶的铁基金属包膜(Fe-Ni-C 合金)的精细结构.结果表明,仅在临近金刚石单晶的包膜内层, C和Fe原子的精细结构有一明显变化;在接触金刚石单晶的包 膜表面上,Fe,Ni最外层电子的结合能比包膜其它区域明显增高.据此认为,邻近金刚石的包膜内层和接触金刚石的包膜表面在 金刚石生长中起重要作用, Fe,Ni原子对C原子的催化很可能是在包膜内层或在金刚石／包膜界面上完成的.

Scanning Auger microprobe (Auger) and X-ray photoelectron spectroscopy (XPS) have been used to investigate the fine structures of the Fe-Ni-C film covering as-grown diamond single crystal synthesized at high temperature and high pressure (HPHT). It is shown that the fine structures of iron and carbon atoms have greatly been transformed only in the inner part of the film adjacent to diamond; the binding energies in the valence bands of iron and nickel atoms on the film contacting diamond obviously increase compared to those in other regions of the film. Hereby, the inner part and diamond/film interface play an important role in the diamond growth under HPHT. It is suggested that the catalysis of iron and nickel to carbon should be finished on the interface or in the inner part of the film.