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在超高压高温条件下,用Ni_(40)Fe_(30)Mn_(30)合金作溶剂-催化剂,生长出粒径为1～1.8mm左右的金刚石单晶。金属-碳薄膜的最大厚度约0.1mm。通过对金属-碳薄膜作显微观察后发现,覆盖在{111}面上的较厚的金属-碳薄膜通常可以分为三个亚层:邻接石墨区的富碳“过渡层”;以金属为主量的中间层和与金刚石相邻的富碳“过渡层”。用JASCAL语言编制电子计算机程序,控制JCXA-733型电子探针,进行碳K_αX射线光谱图的测量。测量结果表明,在邻接石墨区的“过渡层”和以金属为主量的中间层,碳以类石墨结构的形式存在;在与金刚石相邻的“过渡层”,碳以类金刚石结构的形式存在。对金属-碳薄膜和近凹坑侧熔体表层作X射线光电子能谱测量后发现,在金属-碳薄膜近晶体侧厚约200A的表层内,镍以Ni~(2+)氧化态(结合能为855.4eV)+Ni~0(结合能为852.7eV)的形式存在;而在近凹坑侧熔体表层,则全部为Ni~0(结合能为852.4eV)。据此,初步讨论了超高压高温条件下石墨向金刚石转变的演化过程。
Under the condition of high pressure and high temperature, the diamond single crystal with particle size of 1 ~ 1.8mm was grown by using Ni_ (40) Fe_ (30) Mn_ (30) as solvent - catalyst. The maximum thickness of the metal-carbon film is about 0.1 mm. By microscopic observation of a metal-carbon film, it was found that a thicker metal-carbon film covering the {111} plane can be generally divided into three sub-layers: a carbon-rich “transition layer” adjacent to the graphite region; The main amount of the middle layer and diamond-rich carbon adjacent “transition layer.” Computer program was compiled by JASCAL language, JCXA-733 electronic probe was controlled and carbon K_α X-ray spectrum was measured. The measurement results show that carbon exists in the graphite-like structure in the “transition layer” adjacent to the graphite zone and the intermediate layer mainly composed of metal. In the “transition layer” adjacent to the diamond, the carbon is in the form of diamond-like structure exist. The X-ray photoelectron spectroscopy measurements of the surface of the metal-carbon film and the near-pocket side melt revealed that in the surface layer with a thickness of about 200A on the side of the smectic side of the metal-carbon film, nickel is oxidized in the Ni 2+ state Which can be 855.4 eV) + Ni ~ 0 (the binding energy is 852.7 eV). On the near pocket side, the melt surface is all Ni ~ 0 (the binding energy is 852.4 eV). Based on this, the evolution of graphite to diamond transformation under high pressure and high temperature was discussed preliminarily.