将除氮剂Ti(Cu)添加到FeNiCo合金触媒中在高温高压下合成出优质Ⅱa型宝石级金刚石单晶.在压力5.4GPa、温度1600K的条件下沿{111)面合成Ⅱa型宝石级金刚石过程中伴随有黑色粉末析出.采用X射线衍射(XRD)和扫描电子显微镜(SEM)对该黑色石墨粉末的测试表明其为微晶石墨.随着生长时间的延长,这种微晶石墨粉末形成小帽覆盖在金刚石上使金刚石的平均生长速度从30h的1.15mg/h降为50h的0.75mg/h.采取一定工艺措施大大降低了微晶石墨的析出,避免了其对金刚石生长速度的影响.
参考文献
[1] | Sumiya H;Toda N;Satoh S .[J].New Diamond and Frontier Carbon Technology,2000,10(05):233-250. |
[2] | Davies G;Thrower P A .[J].Chemistry and Physics of Carbon,1977,13:1-143. |
[3] | Wentorf Jr R H .[J].Journal of Physical Chemistry,1971,75(12):1833-1837. |
[4] | Strong H M;Chrenko R M .[J].Journal of Physical Chemistry,1971,75(12):1838-1843. |
[5] | Sumiya H;Satoh S.[J].Diamond and Related Materials,1996(05):1359-1365. |
[6] | Sumiya H.;Toda N.;Satoh S. .Growth rate of high-quality large diamond crystals[J].Journal of Crystal Growth,2002(Pt.2):1281-1285. |
[7] | Wang XC;Ma HA;Zang CY;Tian Y;Li SS;Jia XP .Growth of large high-quality type-II a diamond crystals[J].Chinese physics letters,2005(7):1800-1802. |
[8] | LI Shang-Sheng,JIA Xiao-Peng,ZANG Chuan-Yi,TIAN Yu,ZHANG Ya-Fei,XIAO Hong-Yu,HUANG Guo-Feng,MA Li-Qiu,LI Yong,LI Xiao-Lei,MA Hong-An.Effects of Al and Ti/Cu on Synthesis of Type-Ⅱa Diamond Crystals in Ni70Mn25Co5-C System at HPHT[J].中国物理快报(英文版),2008(10):3801-3804. |
[9] | ZANG Chuan-Yi,JIA Xiao-Peng,MA Hong-An,TIAN Yu,XIAO Hong-Yu.Effect of Regrown Graphite on the Growth of Large Gem Diamonds by Temperature Gradient Method[J].中国物理快报(英文版),2005(09):2415-2417. |
[10] | Strong H M;Hanneman R E .[J].Journal of Chemical Physics,1967,46(09):3668. |
[11] | Ma HA.;Jia XP.;Chen LX.;Zhu PW.;Ren GZ.;Guo WL.;Fu XQ.;Zou GT.;Ren ZA.;Che GC.;Zhao ZX. .Superhard MgB2 bulk material prepared by high-pressure sintering[J].Journal of Physics. Condensed Matter,2002(44):11181-11184. |
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