大籽晶法{111}晶面快速外延生长宝石级金刚石单晶
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摘要
借助国产六面顶压机SPD-6×1400,在高温高压条件下,以籽晶的{111}晶面作为大单晶的外延生长面,以Fe_(64)Ni_(36)为金属催化剂,采用温度梯度法对Ib型宝石级金刚石大单晶进行快速生长实验探究。实验结果表明:随着晶种尺寸的增大,晶体的增重速度从2.0 mg/h增加到8.3 mg/h,41 h内晶体生长重量达1.7克拉,尺寸达7 mm。虽然晶体的生长区间有所变窄,大籽晶法仍是快速生长大尺寸宝石级金刚石单晶行之有效的手段。
Experiments on rapid growth of Ib-type gem-quality diamond crystal are carried out at high temperature and high pressure using temperature gradient method, while using SPD-6×1400 domestic cubic anvil apparatus, employing Fe64 Ni36 as catalyst, and taking {111}-facet as epitaxial face. The experimental results indicate that the growth rate increases from 2.0 mg/h to 8.3 mg/h with increasing size of crystal. The diamond crystal has size of 7 mm, 1.7 ct in weight, which is synthesized within 41 h. Although the growth range narrows, it is still an effective method using a large-size crystal as seed to cultivate gemquality diamond crystals in a high growth rate.
Experiments on rapid growth of Ib-type gem-quality diamond crystal are carried out at high temperature and high pressure using temperature gradient method, while using SPD-6×1400 domestic cubic anvil apparatus, employing Fe64 Ni36 as catalyst, and taking {111}-facet as epitaxial face. The experimental results indicate that the growth rate increases from 2.0 mg/h to 8.3 mg/h with increasing size of crystal. The diamond crystal has size of 7 mm, 1.7 ct in weight, which is synthesized within 41 h. Although the growth range narrows, it is still an effective method using a large-size crystal as seed to cultivate gemquality diamond crystals in a high growth rate.
引文
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[2]宋坤,刘羽,贾斌斌,等.铁镍粉末触媒中金刚石大单晶的合成[J].化学工程与装备,2017(4):29-30.
[3]Sumiya H,Harano K,Tamasaku K.HPHT synthesis and crystalline quality of large high-quality(001)and(111)diamond crystals[J].Diamond&Related Materials,2015,58:221-225.
[4]Sumiya H,Toda N,Satoh S.Development of high-quality large-size synthetic diamond crystals[J].Sei Technical Review,2005(60):10-16.
[5]臧传义,马红安,肖宏宇,等.用不同粒度的籽晶生长优质宝石级金刚石单晶[J].人工晶体学报,2006,35(2):355-358.