人工合成金刚石的体扩散机制

本文研究了在合金触媒参与下石墨转变为金刚石的机理。认为在超高压高温条件下,石墨以碳原子集团的形式扩散到溶剂合金中,形成似胶体溶液的扩散区。在合金触媒的催化作用下,正离子化的碳原子集团相变成金刚石结晶基元。结晶基元达到过饱和时,经体扩散在合金与石墨的界面上形核生长,沿金刚石111]和100]方向长大,长成立方-八面体。

Mechanism of Volume Diffusion of Synthetic Diamond

The mechanism of turning graphtite into diamond with the effect of catalyst alloy is studied. The results show that under the condition of super-pressure and high temperature, the graphite spreads into solvent alloy in the form of carbon atomic group and forms a spread layer like colloid solution. Under the action of the catalysis of catalyst alloy, cationized carbon atomic group turns into crystal foundation of diamond. When the crystal foundation of diamond reaches oversaturation, it forms a nucleus on the boundary surface of alloy and graphite by volume spread, growing along 111] and 100] of diamond, and becomes cube-eight face shape.