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Effect of Nitrogen Impurity on Diamond Crystal Growth Processes

机译：氮杂质对金刚石晶体生长过程的影响

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摘要

In this paper, we report on the influence of nitrogen concentration in metal melts on the growth processes, morphology, and defect-and-impurity structure of diamond crystals. In two series of experiments, the concentration of nitrogen in the growth system was varied by adding Fe_3N and CaCN2 to the charge; the other parameters and conditions of the growth were constant: FeNiC system, P = 5.5 GPa, T = 1400 °C, and duration of 65 h. It has been found that, with increasing nitrogen concentration (C_N) in the metal melt from 0.005 to 0.6 atom %, the growth of single crystal diamond is followed by formation of aggregates of block twinned crystals and then by crystallization of metastable graphite. At the stage of single crystal growth, an increase in C_N results in an increase in nitrogen impurity concentration in diamond crystals from about 200 ppm to approximately 1100 ppm, an increase in density of dislocations, twin lamellae, and internal strains, and a change in crystal morphology. Further increases in C_N result in formation of aggregates of block crystals with nitrogen concentration around 120?300 ppm. At nitrogen concentration in the melt higher than a certain critical value, nucleation and growth of diamond are terminated and graphite crystallizes in the diamond stability field.
机译：在本文中，我们报告了金属熔体中氮浓度对金刚石晶体的生长过程，形貌以及缺陷和杂质结构的影响。在两个系列的实验中，通过向装料中添加Fe_3N和CaCN2来改变生长系统中的氮浓度。其他参数和生长条件是不变的：FeNiC系统，P = 5.5 GPa，T = 1400°C，持续时间为65 h。已经发现，随着金属熔体中的氮浓度（C_N）从0.005增加到0.6原子％，单晶金刚石的生长随后是块状孪晶的聚集体的形成，然后是亚稳石墨的结晶。在单晶生长阶段，C_N的增加导致金刚石晶体中的氮杂质浓度从约200 ppm增加到约1100 ppm，位错，双晶层和内部应变的密度增加，并且晶格中的变化晶体形态。 C_N的进一步增加导致形成氮浓度约为120-300ppm的块状晶体的聚集体。在熔体中的氮浓度高于某个临界值时，金刚石的成核作用和生长终止，并且石墨在金刚石稳定性场中结晶。

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