Effects of catalyst height on diamond crystal morphology under high pressure and high temperature

2016 ◽  
Vol 25 (4) ◽  
pp. 048103
Author(s):  
Ya-Dong Li ◽  
Xiao-Peng Jia ◽  
Bing-Min Yan ◽  
Ning Chen ◽  
Chao Fang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Crystal Morphology ◽  
Diamond Crystal

Diamond radiation detector made of an ultrahigh-purity type IIa diamond crystal grown by high-pressure and high-temperature synthesis

2001 ◽  
Vol 72 (2) ◽  
pp. 1406 ◽  
Author(s):  
Teruya Tanaka ◽  
Junichi Kaneko ◽  
Daisuke Takeuchi ◽  
Hitoshi Sumiya ◽  
Masaki Katagiri ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Diamond Crystal ◽  
Radiation Detector ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

Transformation of Nitrogen State in High-Level N-Doped Gem-Quality Diamond Crystal Annealed at High Temperature and High Pressure

2012 ◽  
Vol 29 (10) ◽  
pp. 106102 ◽  
Author(s):  
Guo-Feng Huang ◽  
Xiao-Peng Jia ◽  
Hong-An Ma ◽  
Hong-Bo Bai ◽  
Ji-Wen Yin ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Diamond Crystal ◽  
High Level

Effect of Ni2O3 on diamond crystal growth in an Fe–Ni–C system under high temperature and high pressure

CrystEngComm ◽  
2021 ◽  
Vol 23 (15) ◽  
pp. 2809-2815
Author(s):  
Peiyang Mu ◽  
Guangtong Zhou ◽  
Liangchao Chen ◽  
Zhuangfei Zhang ◽  
Yuewen Zhang ◽  
...  
Keyword(s):  
High Pressure ◽  
Crystal Growth ◽  
High Temperature ◽  
Single Crystals ◽  
Diamond Crystal ◽  
Diamond Synthesis

In this paper, the oxygen-containing diamond large single crystals were successfully synthesized by adding Ni2O3 to the Fe–Ni–C system under HPHT. The oxygen affects the P–T conditions for diamond synthesis, and morphology of diamond.

Synergistic effect of nitrogen and hydrogen on diamond crystal growth at high pressure and high temperature

2014 ◽  
Vol 42 ◽  
pp. 21-27 ◽  
Author(s):  
Shishuai Sun ◽  
Xiaopeng Jia ◽  
Bingmin Yan ◽  
Fangbiao Wang ◽  
Yadong Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Crystal Growth ◽  
High Temperature ◽  
Synergistic Effect ◽  
Diamond Crystal

The Influence of Zinc Doping on the Grain Size and Productivity of Diamond Synthesis in the Ni-Mn-C System at High Pressure and High Temperature

2012 ◽  
Vol 727-728 ◽  
pp. 56-60
Author(s):  
Ana Lúcia Diegues Skury ◽  
Sérgio Neves Monteiro ◽  
Simone S.S. Oliveira
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Diamond Crystal ◽  
Diamond Powder ◽  
Diamond Synthesis ◽  
Doping Agent ◽  
High Temperature Synthesis ◽  
Zn Content ◽  
Zinc Doping ◽  
Reactive Mixture

The development of technological processes for obtaining small size diamond powder is of industrial interest as basic products for roughing and finishing surfaces, like in the polishing of ornamental rocks. Therefore, this work investigates the influence of zinc, as a doping agent, in association with the graphite to diamond transformation, which occurs during high pressure and high temperature synthesis in the presence of Ni-Mn as a catalyst-solvent metallic alloy. Diamond synthesis was carried out at 4.7 GPa of pressure and 1300°C using a reactive mixture with 1:1 ratio of graphite and Ni-Mn alloy powders doped with up to 6% of Zn. The results indicated that the highest diamond yield was obtained for 0.5% while the lowest yield for 6% of Zn. Regardless the Zn content , the diamond crystal were produced with 212/150 μm of granulometry.

Growth of boron suboxide crystals in the B–B2O3 system at high pressure and high temperature

2002 ◽  
Vol 17 (2) ◽  
pp. 284-290 ◽  
Author(s):  
Duanwei He ◽  
Minoru Akaishi ◽  
Brian L. Scott ◽  
Yusheng Zhao
Keyword(s):  
High Pressure ◽  
Crystal Growth ◽  
High Temperature ◽  
Growth Process ◽  
Crystal Morphology ◽  
Experimental Results ◽  
Factors Affecting ◽  
Boron Suboxide ◽  
Different Temperatures

B6O crystal growth from the B–B2O3 system was investigated at 1700–2200 °C and 4.5–6.5 GPa by using two different sample assemblies. Single B6O crystals over 100 μm in size have been synthesized at 5.5 GPa and 2100 °C. This makes it possible to study the properties of this interesting material. The factors affecting the B6O crystal morphology, size, color, and growth process were discussed. The solubility of B6O in B2O3 flux was estimated at 5.5 GPa and different temperatures. On the basis of the experimental results, we suggest two methods to grow large B6O crystals.

The Research on the Surface Topography of Diamond Crystals at High Pressure and High Temperature

2011 ◽  
Vol 399-401 ◽  
pp. 1084-1087
Author(s):  
Qing Cai Su ◽  
Jian Hua Zhang ◽  
Long Wei Yin ◽  
Mu Sen Li
Keyword(s):  
High Pressure ◽  
Electron Microscope ◽  
High Temperature ◽  
Scanning Electron Microscope ◽  
Surface Topography ◽  
Field Emission ◽  
Diamond Crystal ◽  
Diamond Crystals ◽  
Layer Mode ◽  
Scanning Electron

The field emission scanning electron microscope is applied in this paper to analyze the surface topography of diamond crystal synthesized at high pressure and high temperature. The research shows that parallel steps, jagged steps, hexagonal hills exist on (111) plane of diamond. The topography has a relation to the growth way of diamond. The (111) planes of diamond crystal mainly grow in layer mode.

The Carbon Source Analysis for Diamond Crystal Growth from Fe-C System at High Pressure-High Temperature

2008 ◽  
Vol 51 ◽  
pp. 141-147
Author(s):  
Bin Xu ◽  
Li Li ◽  
Mu Sen Li ◽  
Cai Gao ◽  
Ren Hong Guo
Keyword(s):  
High Pressure ◽  
Crystal Growth ◽  
High Temperature ◽  
Carbon Source ◽  
Electron Density ◽  
Growth Mechanism ◽  
Valence Electron ◽  
Diamond Crystal ◽  
Relative Electron Density ◽  
Relative Electron

Despite many studies have been carried, there is no clear understanding of the growth mechanism involved in the high-pressure and high-temperature (HPHT) diamond synthesis with metal catalyst, especially the problem about carbon source. In this paper, the lattice constants of diamond, graphite and Fe3C at HPHT were calculated with the linear expansion coefficient and elastic constant. Then based on the empirical electron theory of solids and molecules (EET), the valence electron structures of them and their common crystal planes were calculated, and the boundary condition of electron movement in the Thomas-Fermi-Dirac theory modified by Cheng (TFDC) was applied to analyzing the electron density continuity of the interface. It was found that the relative electron density differences across graphite/diamond interfaces are great and discontinuous at the first order of approximation, while the relative electron density differences across Fe3C/diamond interfaces were continuous. The results show that the carbon atom cluster is easier to decompose from Fe3C than from graphite and to transform into diamond structure, so the carbon source for diamond crystal growth may come from the decomposition of Fe3C instead of graphite. Accordingly, the diamond growth mechanism was analyzed from the viewpoint of valence electron structure.

Sign in / Sign up

Export Citation Format

Share Document