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降温工艺对宝石级金刚石单晶品质的影响

肖宏宇 秦玉琨 刘利娜 鲍志刚 唐春娟 孙瑞瑞 张永胜 李尚升 贾晓鹏

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降温工艺对宝石级金刚石单晶品质的影响

肖宏宇, 秦玉琨, 刘利娜, 鲍志刚, 唐春娟, 孙瑞瑞, 张永胜, 李尚升, 贾晓鹏

Effects of cooling process on qualities of Gem-diamond single crystals

Xiao Hong-Yu, Qin Yu-Kun, Liu Li-Na, Bao Zhi-Gang, Tang Chun-Juan, Sun Rui-Rui, Zhang Yong-Sheng, Li Shang-Sheng, Jia Xiao-Peng
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  • 在国产六面顶压机上,采用温度梯度法,在5.6 GPa,1200–1400 ℃的高压高温条件下,裂晶问题频繁出现的合成周期内,围绕裂晶现象开展了Ib型宝石级金刚石单晶的生长研究,系统考察了降温工艺对宝石级金刚石单晶品质的影响.针对宝石级金刚石单晶常见的裂纹缺陷,借助于扫描电子显微镜,分别对优质金刚石单晶和存在裂纹金刚石单晶的表面形貌进行了表征;利用微区傅里叶转换红外光谱测试手段,对上述两类晶体的N杂质含量分别进行了测试,依据测试结果,对裂晶出现的原因进行了分析;分别采用传统断电降温和缓慢降温工艺,考察了晶体生长结束后的降温工艺对宝石级金刚石单晶品质的影响.结果表明,缓慢降温工艺在很大程度上可以有效抑制裂晶问题出现.另外,从宝石级金刚石单晶品质和单晶受到的外应力两个方面着手,分别对裂晶出现的机理和采用缓慢降温工艺有效解决裂晶问题的机理进行了讨论.
    In the paper, under 5.6 GPa and 1200-1400℃, the type Ib diamond single crystals on defect-free[111] -oriented seed crystals are synthesized in a cubic anvil under high pressure and high temperature when the crack problem of diamond single crystal appears frequently. Highpurity Fe-Ni-Co solvents are chosen as the catalysts. Highpurity graphite powder (99.99%, purity) is selected as a carbon source. The effects of cooling process on the qualities of Gem-diamond single crystals are studied carefully. First, in order to study the common crack defects of diamond single crystals, using scanning electron microscope (SEM), the surface morphologies of high quality diamond single crystals and crack crystals are obtained respectively. Our SEM test results show that the surfaces of the crack crystals and the high quality crystals are all very smooth. Therefore, the crack crystal problem is not directly caused by the unordered accumulation of carbon. Second, the concentrations of nitrogen in the high quality diamonds and crack crystals are measured by Fourier transform infrared. In our studies, the nitrogen content of the diamond single crystal with crack is similar to the nitrogen content of high quality single crystal, so the appearance of crystal crack is not caused by high impurity content. According to the test results and the regularity of the occurrence of crack crystals, the reasons for the occurrence of crack crystals are analyzed seriously. When the weather conditions such as seasonal change, wind, rain or snowfall are not very stable, the probability of crack crystal problem to appear will increase greatly. In our opinion, the decrease of diamond crystal quality caused by the fluctuation of external growth conditions is the internal cause of crack crystal problem appearing. After growing diamond crystals, choosing the traditional power failure mode and slowing cooling process respectively, the effect of cooling process on the quality of diamond single crystal is investigated. In the season of the crack problem occurring frequently, choosing power failure cooling process, cracks appear in both diamond crystals with 1.3 mm or 6.0 mm in diameter. With the slow cooling process, the synthetic diamond crystals with 1.2 mm or 5.8 mm in diameter are all high-quality single crystals with no cracks inside. The research results show that the slow cooling process can effectively restrain the occurrence of crack crystal problems. In addition, the mechanism problems of crack crystals and the mechanisms of the effects of slow cooling process on diamond crystal qualities are discussed in detail. We believe that the slow cooling process is effective in solving the crack crystal problem, which is mainly attributed to the following two aspects:on the one hand, the slow cooling makes the internal stress of diamond single crystal growing effectively released, which improves the compressive strength of the crystal and the crystal quality as well; on the other hand, the slow cooling makes the solidification process of the catalyst melt slowly, which provides enough time for the crystal to balance the external stress of the catalyst and the equipment, so that the crystals, which are not affected by the unbalanced external stress, are not cracked.
      通信作者: 秦玉琨, qinyukun2046@163.com
    • 基金项目: 国家自然科学基金青年科学基金(批准号:61007023)、河南省科技攻关计划(批准号:162102210275)、河南省教育厅项目(批准号:16A140044,16A140012)、河南省高等学校骨干教师资助计划(批准号:2015GGJS-112)和河南省高等学校重点科研项目(批准号:17A430004,18A430017)资助的课题.
      Corresponding author: Qin Yu-Kun, qinyukun2046@163.com
    • Funds: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 61007023), the Key Science and Technology Program of Henan Province, China (Grant No. 162102210275), the Education Department of Henan Province, China (Grant Nos. 16A140044, 16A140012), the Young Core Instructor and Domestic Visitor Foundation from Henan Province Higher Education Institutions of China (Grant No. 2015GGJS-112), and the Natural Science Foundation of Henan Higher Education Institutions of China (Grant Nos. 17A430004, 18A430017).
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    Sumiya H, Toda N, Satoh S 2002 J. Cryst. Growth 237-239 1281

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    Hu M H, Bi N, Li S S, Su T C, Zhou A G, Hu Q, Jia X P, Ma H A 2015 Chin. Phys. B 24 038101

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    [13]

    Schein J, Campbell K M, Prasad R R, Prasad R R, Binder R, Krishnan M 2002 Rev. Sci. Instrum. 73 18

    [14]

    Sumiya H, Toda N, Satoh S 1997 Diam. Relat. Mater. 6 1841

    [15]

    Palyanov Y N, Borzdov Y M, Kupriyanov I N, Bataleva Y V, Khohkhryakov A F 2015 Diam. Relat. Mater. 58 40

    [16]

    Bormashov V S, Tarelkin S A, Buga S G, Kuznetsov M S, Terentiev S A, Semenov A N, Blank V D 2013 Diam. Relat. Mater. 35 19

    [17]

    Zhang H, Li S S, Su T C, Hu M H, Li G H, Man H A, Jia X P 2016 Chin. Phys. B 25 118104

    [18]

    Sun S S, Liu M N, Cui W, Jia X P, Ma H A, Yang L Y 2016 Int. J. Refract. Met. Hard Mater. 61 79

    [19]

    Yan B M, Jia X P, Fang C, Chen N, Li Y D, Sun S S, Ma H A 2015 Int. J. Refract. Met. Hard Mater. 54 309

    [20]

    Palyanov Y N, Kupriyanov I N, Borzdova Y M, Bataleva Y V 2015 Cryst. Eng. Comm. 17 7323

    [21]

    Sumiya H, Harano K, Tamasaku K 2015 Diam. Relat. Mater. 58 221

    [22]

    Xiao H Y, Su J F, Zhang Y S, Bao Z G 2012 Acta Phys. Sin. 61 248101 (in Chinese) [肖宏宇, 苏剑峰, 张永胜, 鲍志刚 2012 物理学报 61 248101]

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出版历程
  • 收稿日期:  2018-01-28
  • 修回日期:  2018-04-18
  • 刊出日期:  2019-07-20

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