The effect of metal–solvent properties on the alteration of specific zones on a carbon phase diagram

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• 作者：Potemkin ; Andrei ; Poliakov ; Vladimir
• 关键词：High pressure/high temperature synthesis ; Catalytic process ; Nucleation and growth
• 刊名：Diamond and Related Materials
• 出版年：2001
• 出版时间：September - October, 2001
• 年：2001
• 卷：10
• 期：9-10
• 页码：1597-1601
• 全文大小：781 K

文摘

In this work Fe–Sb and Fe–Ge alloys (up to 10 wt. % Sb, Ge) were used as a solvent-catalyst for diamond synthesis at pressures of 5–6 GPa and temperatures of 1800–1900 K. Carbon solubility, capillary properties and synthesis performance of alloys were investigated. When using alloys with additive content up to 10 wt. % , rapid graphite to diamond transformation was observed. In spite of identical P,T-conditions and identical composition of a solvent–catalyst, different crystal morphology on the top and on the bottom sides of a diamond polycrystalline layer was formed, although their habit type {111} was identical. Thermodynamic and kinetic aspects of these phenomena are discussed.