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Cholerny Spammer
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 Posted: Fri 20:51, 24 Dec 2010 Post subject: glätteisen ghd Legal CVD diamond layer surface aco |
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Legal CVD diamond layer surface acoustic wavelet fine piece of crystal growth
Diamond due to the compressive stress, with Figure 5 and Figure 4, compared to almost no non-diamond graphite phase width equal to the peak envelope. No 1l4ocrtl peak. In addition,[link widoczny dla zalogowanych], this study also conducted a scanning electron microscope. Figure 7 is shown in Figure 4 SEM images of the sample,[link widoczny dla zalogowanych], deposition conditions, the methane concentration of 0.9, pressure of 900Pa, adding argon gas, under 4m in scale, they can not clearly see the grain size. Due to equipment constraints, not to further illuminate the grain nano-scale photos, but can already see its fine grain. And Figure 8 is deposited under the general conditions of diamond film samples scanned photos, and added to argon, low pressure samples are compared in Table 1】 1, a detailed description of the six experimental samples TablelDetailedexplanationoitheexperimentofsixsamples pressure (Pa) 180015001200900900900 methane concentration () 1.41.41.40.90.60.6 whether the ancient diamond phase Yes Yes Yes Yes Yes Yes the presence of nano-diamond phase No Yes Yes with or without the presence of non-diamond phase No Yes Yes Yes without a corresponding Figure 1 Figure 2 Raman Photos Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 pressure 900Pa, methane concentration of 0.9, argon l2 growth of CVD diamond under the scanning electron micrograph of Fig. 7ElectronicscanningchartofCVDdiamondunder900Pa12 Figure 8 Pressure 3000Pa, under the conditions of methane concentration growth of 3 Scanning electron micrographs of CVD diamond (proportional scale for the lO ~ m) Fig. 8ElectronicscanningchartofCVDdiamondunder3000Pa the condition that the pressure of 3000Pa, methane concentration of 3, not containing added argon, can be seen from the figure, the grain is higher, at around 3 to 4 btm. Usually in the appropriate substrate temperature and pressure (2000Pa ~ 8000Pa) conditions, the methane concentration (usually 0.5 ~ 40A) on the crystal quality, crystal and grain size has some influence; methane concentration decreased in favor of diamond phase purity improvement; the same time, changes in air pressure had little effect on the crystal quality. However, in this context, the growth of diamond film with crystal clear, sharp diamond Raman peak and other significant features. However, when reduced to very low pressure range, such as air pressure in the range of this experiment (900Pa ~ 1800Pa), a marked pressure on the purity of the grain. Pressure decreased significantly lower purity crystals, must be reduced to very low methane concentration conditions (O.6 ~ 1.4) can have a good which is the diamond Raman peak in [] and said,[link widoczny dla zalogowanych], reduce the reaction low gas pressure to the pressure, and add chlorine, it will deposit a nanocrystalline diamond film. 4 Conclusion In the low pressure range, the same argon concentration, with the pressure reduced,[link widoczny dla zalogowanych], the concentration of methane must be reduced accordingly in order to ensure that similar crystalline quality diamond. At the same time, reduce the pressure reaches a certain value, the diamond grains was thinner,[link widoczny dla zalogowanych], the test can achieve nanometer level. Thanks: On the world to be here to thank the Chief Engineer of the detailed marking the company Dong Changshun and enthusiastic help, and the Institute of Hu Jungang superhard materials, Qinsong Yan, deputy director of equipment and materials they give great help
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