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FeNi alloy as the catalyst metal high temperature and pressure growth of diamond
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FeNi alloy as the catalyst metal high temperature and pressure growth of diamond film
System to provide experimental basis. 2. Experiments on the cubic press, make use of pyrophyllite pressure transmission medium, the graphite film and turn into the pyrophyllite FeNi alloy film in the cavity, the pressure 5.2Gpa, temperature of 1620K under the conditions of synthetic diamond, heating plus pressure 30min, remove the synthesis block, broke down the synthesis of rod,uggs nederland, bar cross-section in the synthesis of diamond crystals and can see a lot of metal film,abercrombie madrid, shown in Figure 1 (a), Figure 1 (b) diamond is surrounded by a metal film After removing the metal in the diamond film after the picture. (A) holding a cross-section of synthetic diamond single crystal and exposed metal film (b) remove the metal film of diamond particles big picture 'holding cross-section of Figure 1 reveals the synthetic diamond crystal and the metal film in the scanning electron microscope of Figure 1 (b) diamond as shown in the inner wall surface 2.1FeNi metal film microstructure morphology of the metal film location for several typical microscopic observation, the diamond crystal was in contact with the metal film FeNi table to the following results: as the metal surface membrane wall, inner wall 12 Hao Zhao observed many Indian FeNi alloy as the catalyst metal high temperature and pressure growth of diamond film fish stripes, shown in Figure 2,uggs online bestellen, Figure 3. It is noteworthy that the fish-like stripes in between the accumulation of small particles. These fish-shaped stripe length is about the size of 1.0m, width 0.3m, fish-like stripes in between the small particle size even smaller. 2.2FeNi microscopic cross-section of metal film morphology (1) FeNi metal film of microscopic cross-section of metal film morphology shown in Figure 2 fish like striped wall metal film 4 line appearance of the local section (near the graphite) (2 ) FeNi metal film close to the microscopic cross section of graphite morphology shown in Figure 5, for the point-like particles composed of stripes, point-like particles of size 300nm, small particles appear white, indicating that the conductivity is not good, there should be carbon atoms gathered into. (3) FeNi metal film microstructure morphology of the middle part of Figure 6, the figure is not conductive particles are connected together to form a strip, strip length of 0.6um. (4) FeNi metal film close to the diamond cross-section of Figure 4, Figure 4 is not entered in the left side of the metal film of graphite, in the middle with a white strip of metal parts of the structure of the membrane cross-section, the right is the white part of the inner wall of the metal film . Cross-section of the metal film is divided into three different parts of the microscopic morphology observation available. Figure 3 fish-shaped metal film stripes wall to enlarge Figure 5 cross-section of island metal film morphology (close to graphite) microscopic morphology shown in Figure 7,franklin marshall, we can see from the pictures its morphology and Figures 5 and 6 are different,abercrombie espaa, island together into a strip. The distribution of these strips is oriented perpendicular to the inner wall of the metal film. (5) FeNi metal film cross-section and wall (smooth surface) at the junction of the morphology shown in Figure 8,uggs kopen, Figure 8 shows the inner wall of the metal film with three salient points of the island or strip cross-section structure of a relationship. However, the wall structure of the fish-like stripes and did not find a cross-section correlation. Figure 6 13 industrial diamond cross-section of island morphology of the metal film (metal film center) Figure 7 bird-shaped cross-section of metal film morphology (near the inner wall of the metal film) Figure 8 metal film cross-section of the wall and the metal film interface morphology 3. Discussed in the diamond growth process. Graphite at high temperature under high pressure, carbon atoms or atom groups to form around the diamond melt into the surrounding FeNi metal membrane, after the temperature field and pressure field under a long to the diamond surface,abercrombie fitch madrid, the diamond growing up. Figure 1 Figure 8 points of the metal film to get pictures of graphite morphology and FeNi alloys quenched samples. A large number of the metal membrane carbon atoms or carbon atoms group 1], under heat and pressure to form solid solution with the FeNi and quickly cooled to 14 carbon atoms or atomic groups occur cohesion. Therefore, the reason that in the aggregate cross-section of the conductive metal film of poor white granules or white stripe is the aggregation of carbon atoms. In the same cooling conditions,uggs nederland, the carbon atom or atomic group cohesion results to differ, indicating that high temperature and pressure conditions,abercrombie dublin, these carbon atoms or atomic groups on the existence of different forms, but also with this different form of graphite to diamond formation the transition. It is noteworthy that the carbon atoms in the alloy in the form of complex Fe-C at atmospheric pressure and material condensation process is not observed,ugg outlet, indicating that pressure on the metal solidification process has an important impact [4]. 4. Findings observed in the fish-shaped metal film stripes and metal film section of the carbon atoms of the island structure of graphite to diamond phase transition in-depth study of great significance. Thanks,franklin marshall sale, Comrade Zhao-Tian Lu Steel Research Institute provides a Fe-based alloys, the first king of Yan, Li completed a two comrades high temperature and pressure experiments, the authors express my sincere thanks. References 1. Hao Zhao and India. Reported high-pressure physics. 1997.11:1692. Zhang Zhi. Metal physics. 1999.3.5:285
