| Effect of Regrown Graphite on the Growth of Large Gem Diamonds by Temperature Gradient Method |
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| 作者姓名： | 臧传义 贾晓鹏 马红安 田宇 肖鸿宇 |
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| 作者单位： | The National Key Laboratory for Superhard Materials, Jilin University, Changchun 130012 |
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| 摘 要： |
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| 关 键 词： | 钻石 金刚石 晶体再生 石墨 温度控制 |
| 收稿时间： | 2005-05-17 |
| 修稿时间： | 2005-05-17 |
Effect of Regrown Graphite on the Growth of Large Gem Diamonds by Temperature Gradient Method |
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| Cang ChuanYi;Gu XiaoPeng;Ma GongAn;Tian Yu;Xiao HongYu.Effect of Regrown Graphite on the Growth of Large Gem Diamonds by Temperature Gradient Method[J].Chinese Physics Letters,2005,22(9):2415-2417. |
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| Authors: | Cang ChuanYi;Gu XiaoPeng;Ma GongAn;Tian Yu;Xiao HongYu |
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| Abstract: | Generally, when growing high-quality large gem diamond crystals by temperature gradient method under high pressure and high temperature, the crystal growth rate is only determined by the temperature gradient. However, we find that the seed crystal cannot completely absorb all the diffused carbon sources, when growing gem diamonds under a higher temperature gradient. Other influence factors appear, and the growth rate of growing diamonds is partly dependent on the crystalline form of superfluous unabsorbed carbon source, flaky regrown graphite or small diamond crystals nucleated spontaneously. The present form is determined by the growth temperature if the pressure is fixed. Different from spontaneous diamond nuclei, the appearance of regrown graphite in the diamondstable region can retard the growth rate of gem diamonds substantially, even if the temperature gradient keeps unchanged. On the other hand, the formation mechanism of metastable regrown graphite in the diamond-stable region is also explained. |
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