Data on the interaction of the Fe–Ni melt with CaCO3 and graphite at 5 GPa and 1400°С under the thermogradient conditions used in experiments on the growth of diamond on the BARS high-pressure apparatus are presented. The phase composition and component composition of the fluid captured by diamonds in the form of inclusions were studied by gas chromatography–mass spectrometry (GC–MS). Diamonds were synthesized from graphite. During the interaction of the Fe–Ni melt with CaCO3, Ca–Fe oxides and (Fe, Ni)3C carbide were formed. The stability of heavy hydrocarbons under the experimental conditions was confirmed. It was established that the composition of the fluid in synthesized diamonds is close to the composition of the fluid from inclusions in some natural diamonds. Nevertheless, it was concluded that crystallization of large diamonds under natural conditions is hardly possible due to the filling of the main crystallization volume with refractory oxide phases.

中文翻译：

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高压下的金刚石结晶：金属-石墨和金属-碳酸盐系统的相对效率

在 BARS 高压设备上金刚石生长实验中使用的热梯度条件下，Fe-Ni 熔体与 CaCO3 和石墨在 5 GPa 和 1400°С 的相互作用数据。通过气相色谱-质谱法 (GC-MS) 研究了以包裹体形式被金刚石捕获的流体的相组成和组分组成。金刚石是由石墨合成的。在 Fe-Ni 熔体与 CaCO3 相互作用的过程中，形成了 Ca-Fe 氧化物和 (Fe, Ni)3C 碳化物。重烃在实验条件下的稳定性得到证实。已确定合成钻石中流体的成分与某些天然钻石中的内含物的流体成分接近。尽管如此，