优质立方六面体金刚石大单晶的生长研究  

Growth of High-quality Large Cubic Gem Diamond Crystals

作　　者：陈奎[1] 臧传义[1] 陈立学[2] 陈孝洲[1] 吴杰[1] 王杰[1] 

机构地区：[1]河南理工大学材料科学与工程学院,焦作454000 [2]吉林大学超硬材料国家重点实验室,长春130012

出　　处：《人工晶体学报》2010年第2期324-327,共4页Journal of Synthetic Crystals

基　　金：河南省教育厅自然科学基金(No.2009A430014);吉林大学超硬材料国家重点实验室开放课题(No.200801)

摘　　要：高温高压静压触媒法合成的金刚石单晶,往往呈现六八面体形貌,因为立方六面体单晶{100}面的生长区间相对较小。本研究利用高温高压温度梯度法,自制Fe-Ni合金触媒,通过对合成组装和工艺进行合理调整后,控制晶体在相对低温适合{100}面生长区域内生长,得到的晶体均呈现完整立方六面体形貌;同时为抑制包裹体和其他杂质的进入,人为的提高晶体的径向平铺生长速度,抑制其轴向生长速度。以在33 h内合成的优质立方六面体晶体为例,晶体最大方向尺寸达到7.3 mm,重1.2克拉,其径向生长速度达到0.22 mm/h,轴向生长速度仅为0.08mm/h,增重速度为7.3 mg/h。Under high pressure and high temperature（HPHT）,the diamond crystals often show hexoctahedral shape because of the growing region of the cubic {100} surface of a single crystal is very narrow.The diamond crystals were controlled to grow at a relatively low temperature,which is suitable for growth of {100} surface by temperature gradient method（TGM） under HPHT,with self-made Fe-Ni alloy solvent assisted,through adjusting the process of assembling and synthesis appropriately.All the crystals were synthesized to show complete morphology of cubic hexahedron.At the same time,the radial crystal growth rate and inhibited its axial growth rate were improved to inhibit inclusions and other impurities into the crystal.Within 33 h,high-quality hexahedral cubic crystals can be synthesized.The size of the longest dimension is 7.3 mm and the weight is 1.2 carat.Its radial growth rate achieves 0.22 mm/h,axial growth rate is only 0.08 mm/h,and the weight growth rate could increased to 7.3 mg/h.

关 键 词：高温高压温差法 立方六面体 径向生长速度 轴向生长速度 

分 类 号：O78[理学—晶体学]