Abstract The stability and solubility of diamond in cobalt at a pressure of 5 GPa was investigated. At temperatures ranging from 1000 °C and 1350 °C, diamond can be dissolved in cobalt without graphitization. Meanwhile, the solubility of single diamond crystals in cobalt was measured at 5 GPa and temperatures of up to 1300 °C through weight analysis, and it was found to increase with the increase in temperature. The morphological changes of the diamond crystals after high-pressure and high-temperature (HPHT) treatments were observed using a scanning electron microscope. The resulting quantitative data and morphology analysis enabled the construction of a scheme for the morphological evolution of diamond crystals during their dissolution in cobalt at HPHT. The diamond formation process in cobalt solvent is discussed in relation to the dynamic equilibrium.

中文翻译：

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5 GPa下金刚石在钴中的溶解度和稳定性

摘要 研究了金刚石在 5 GPa 压力下在钴中的稳定性和溶解度。在 1000 °C 到 1350 °C 的温度范围内，金刚石可以溶解在钴中而不会石墨化。同时，通过重量分析测得单晶金刚石在钴中的溶解度在 5GPa 和高达 1300°C 的温度下，发现它随着温度的升高而增加。使用扫描电子显微镜观察高压高温（HPHT）处理后金刚石晶体的形态变化。由此产生的定量数据和形态分析有助于构建金刚石晶体在高温高压下溶解在钴中的形态演变方案。