Synthesis of large diamond crystals containing high-nitrogen concentration at high pressure and high temperature using Ni-based solvent by temperature gradient method
Synthesis of large diamond crystals containing high-nitrogen concentration at high pressure and high temperature using Ni-based solvent by temperature gradient method
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DOI：
10.1088/1674-1056/19/11/118101
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发表时间：
2010-11
影响因子：
1.7
通讯作者：
黄国锋;贾晓鹏;李尚升;张亚飞;李勇;赵明;马红安
中科院分区：
文献类型：
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作者：
黄国锋;贾晓鹏;李尚升;张亚飞;李勇;赵明;马红安
本文报道了用镍基催化剂/溶剂，以NaN_3为掺杂剂，用温度梯度法在中国-6×1200型立方顶压机(SPD-6×1200)上高温高压合成出形状完美的绿色大单晶金刚石，经红外吸收光谱计算，最高氮浓度可达1214ppm~1257ppm。合成条件约为5.5 GPa1240-1300°C。研究了高氮含量金刚石的生长行为。结果表明，在相同的温度和压力下，随着合成体系中NaN3含量的增加，合成优质金刚石的合成温区变窄，金刚石晶体由立方八面体转变为八面体，晶体生长速度变慢，但合成金刚石中氮的掺杂浓度增加。
This paper reprots that with Ni-based catalyst/solvent and with a dopant of NaN3, large green single crystal diamonds with perfect shape are successfully synthesized by temperature gradient method under high pressure and high temperature in a China-type cubic anvil high-pressure apparatus (SPD-6 × 1200), and the highest nitrogen concentration reaches approximately 1214–1257 ppm calculated by infrared absorption spectra. The synthesis conditions are about 5.5 GPa and 1240–1300 °C. The growth behaviour of diamond with high-nitrogen concentration is investigated in detail. The results show that, with increasing the content of NaN3 added in synthesis system, the width of synthesis temperature region for growth high-quality diamonds becomes narrower, and the morphology of diamond crystal is changed from cube-octahedral to octahedral at same temperature and pressure, the crystal growth rate is slowed down, nevertheless, the nitrogen concentration doped in synthetic diamond increases.