Diamond Growth and Morphology under the Influence of Impurity Adsorption

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• 作者：Yuri N. Palyanov ; Alexander F. Khokhryakov ; Yuri M. Borzdov ; Igor N. Kupriyanov
• 刊名：Crystal Growth & Design
• 出版年：2013
• 出版时间：December 4, 2013
• 年：2013
• 卷：13
• 期：12
• 页码：5411-5419
• 全文大小：832K
• 年卷期：v.13,no.12(December 4, 2013)
• ISSN：1528-7505

文摘

In this paper, we report on the diamond growth and morphology evolution of diamond crystals of cube-octahedron series under the effect of impurity adsorption. In the first series of experiments it is established that in the Ni_0.7Fe_0.3鈥揅 system without impurity additives diamonds of predominantly cubic, cuboctahedral and octahedral habit crystallize at 1300, 1335, and 1370 掳C, respectively. In the second series of experiments, the effect of H₂O additive, in amount 0.3 wt %, on diamond growth and morphology was studied at different temperatures. It is found that the impurity adsorption effect leads to growth inhibition followed by complete blocking of growth of the {100} faces. At these conditions, the {111} faces continue to grow but reduce in area due to the inhibition of the ends of the {111} growth layers. As a result, a rich morphological diversity of antiskeletal diamond crystals was produced, whose growth and design are determined by the impurity adsorption effect and crystallization temperature. The established regularities of the crystal morphology evolution are in good agreement with the existing concepts of crystal growth under the impurity adsorption effect and structural crystal-chemical features of the diamond faces. Metal鈥揷arbon complexes containing hydrogen related groups together with hydroxyl, carbonyl and carboxyl groups are supposed to act as the adsorbing impurities.