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| 1 | Effects of carbon diffusing field in alloy solvent on the growth of tower-shape diamond single crystal显示文摘High-quality type-Ib tower-shape diamond single crystals were synthesized in cubic anvil high pressure apparatus (SPD-6×1200) at 5.4 GPa and 1250-1450°C. The (100) face of seed crystal was used as the growth face, and FeNiMnCo alloy was used as the solvent/catalyst. Two kinds of carbon diffusing fields (type-B and type-G) were simulated by finite element method (FEM). Using the two kinds of carbon diffusing fields, many diamond single crystals were synthesized. The effects of carbon diffusing fields on the crystal quality and β value (the ratio of height to diameter of diamond crystal) were studied. The results show that using type-B diffusing field, considerable inclusions appeared in tower-shape diamond crystals with high β values; however, using type- G diffusing field, inclusions were reduced markedly in high β values tower-shape diamond crystals, and the crystal, up to 0.6 carat in weight and 5.3 mm in size, was synthesized. Experimental phenomena were explained well with the help of the FEM. | XIAO HongYu MA HongAn TIAN Yu LI Rui LI ShangSheng MA LiQiu LI Yong JIA XiaoPeng | 2010 | Chinese Science Bulletin2010，55，1： | 5 |
| 2 | Equilibrium geometric structure and electronic properties of Cl and H_2O co-adsorption on Fe(100) surface显示文摘Based on the first principles density functional theory,the equilibrium geometric structure and surface electronic properties of Cl and H2O co-adsorption on the Fe(100) surface are investigated.The results indicate that the optimal adsorption site for Cl and H2O co-adsorption on the Fe(100) surface is the location of Cl at the bridge site and H2O at the top site.Compared with the Fe(100)/H2O adsorption system,remarkable changes in geometric structure and electronic properties occur,owing to the presence of Cl in the Fe(100)/(H2O+Cl) adsorption system.The analysis of equilibrium geometric structure and surface electronic properties shows that the presence of Cl in the Fe(100)/(H2O+Cl) adsorption system unstablizes the Fe surface,making it easy to lose electrons. | ZHAO Wei WANG JiaDao LIU FengBin CHEN DaRong | 2009 | Chinese Science Bulletin2009，54，8： | 2 |
| 3 | Synthesis of high quality type-Ib diamond crystals in carats grade显示文摘High quality type-Ib tower-shape gem-diamond crystals in carats grade were synthesized in cubic anvil high pressure apparatus (SPD-6×1200) at 5.4 GPa and 1250-1450°C. The relationship between the growth time and the weight of growth diamond has been gained. The faces of {110} and {113} were found in the synthetic diamond crystals frequently. We found that the relative growth rate of {113} face was descending with the increase of growth temperature, and that of {110} face had no obvious change with the increase of the growth temperatures and the growth time. In the work, the crystal defects were studied carefully, and the reasons for the appearance of the defects were also obtained. Some diamond crystals have been polished into the anvil of DAC (Diamond Anvil Cell) and the diamond jewelry. Compared with natural diamond crystal, synthetic diamond crystal has the merits such as small grinding quantity, low cost, etc., so it can be widely used in super high pressure field and gemstone industry. | XIAO HongYu JIA XiaoPeng MA HongAn LI ShangSheng LI Yong ZHAO Ming | 2010 | Chinese Science Bulletin2010，55，14： | 1 |
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