晶面结构非均匀性对金刚石晶形的影响

Effect of Structure Inhomogeneity of the Surface Lattice on Diamond Morphology

1.
International Center for Materials Physics, Academia Sinica, Shenyang 110015, China;
2.
Tianjin Radio & TV University, Tianjin 300191, China

摘要: 不仅考虑表面能，同时也引入表面结构非均匀性自由焓Gsti，通过热力学分析，解释了随着晶体的逐渐长大而{110}面常在金刚石的外形中消失的机理，并用逆推法计算了有关数值。
- 金刚石 /
- 形态 /
- 理论分析
Abstract: According to W. D. Harkins' theory we calculated the surface energy of some diamond planes as: (100)=9.068 J/m2, (110)=6.412 J/m2, (111)=15.706 J/m2 and b(111)=5.235 J/m2. If the final form of diamond could be accounted for by Gibbe-Wulff's crystal growth taw, the probability of the appearance of {110} planes in the final form of diamond would be much large than that of the {100} planes. But this is in contrast to the actual fact. In this paper we introduce both the sarface energy and the surface structure inhomogeneity free enthalpy Gsti to interpret, from the thermodynamics analyses, why the {110} planes often disappear as the diamond crystal grows. Some related data were calculated by converse inference method.
- diamond /
- morphology /
- theoretical analyses