【摘要】 本文分别用N i70Mn25Co5合金粉末和含添加剂硫的N i70Mn25Co5合金粉末作触媒合成了金刚石单晶,通过对比,发现添加剂硫的引入使得金刚石内的包裹体含量增加,使晶体表面出现熔坑;利用X射线荧光光谱对晶体的杂质成分、相对含量进行了分析,发现杂质元素锰、硫的含量随着触媒中硫的添加量的增加呈增加趋势,由此推测在金刚石生长过程中生成了难熔的MnS,MnS以包裹体的形式进入金刚石中,在一定程度上破坏了金刚石的晶格排列,使得表面出现熔坑。更多还原

【Abstract】 In this paper, single-crystal diamonds were synthesized using respectively Ni₇₀Mn₂₅Co₅ alloy powder and sulfur-added Ni₇₀Mn₂₅Co₅ alloy powder as catalyst. Optical pictures of the diamonds were compared.It is found that the introduction of additive sulfur made the inclusions content of diamonds increase. A lot of etch pits were observed on the surface of sulfur-doped diamonds. Using X-ray fluorescence spectrum, the composition and the relative content of impurities in diamond crystals were analyzed. It is found that the content of impurity elements,namely manganese and sulfur,showed a tendency to increase when the sulfur content in catalyst increases. So it is inferred that MnS, which is difficult to melt, had formed during the synthesis. MnS had entered into diamonds in the form of inclusions. This destroyed the lattice structure of diamond to a certain extent, and further led to the appearance of some etch pits on diamond surface.更多还原