【摘 要】
：
The metallic film surrounding a diamond single crystal, which plays an important role in the diamond growth from an Fe-Ni-C system, has been successfully invest
【机 构】
：
Department of Materials Science and Engineering, Shandong Institute of Architecture and Engineering,
论文部分内容阅读
The metallic film surrounding a diamond single crystal, which plays an important role in the diamond growth from an Fe-Ni-C system, has been successfully investigated by using transmission-electron microscopy (TEM),Raman spectroscopy and x-ray photo-electron spectroscopy (XPS). Diamond and graphite were not found in surface layer (near diamond) of the film by TEM and Raman spectroscopy, but a parallel relationship exists between the (111) plane of γ-(Fe,Ni) and the (100) plane of (Fe, Ni)3C in this region. Compared with that of solvent metal (catalyst) near diamond, the binding energy in the valence bands of iron, nickel and carbon atoms of the film has an increase of 0.9 eV. According to the microstructures on the film obtained by the TEM, Raman spectra, and XPS, the catalytic mechanism of the film may be assumed as follows. In the surface layer of the film,iron and nickel atoms in the γ-(Fe, Ni) lattice can absorb carbon atoms in the (Fe, Ni)3C lattice and make them transform to an sp3-like state. Then carbon atoms with the sp3-like structure are separated from the (Fe,Ni)3C and stack on the growing diamond crystal. This study provides a direct evidence for the diamond growth from a metallic catalyst-graphite system under high temperature and high pressure.
其他文献
An analytic expression for the ionization amplitude of hydrogen by electron impact is found to contain a polynomial by an optimal truncation in an asymptotic se
We develop an uncooled infrared imaging device that contains a SiN-Au bimaterial micro-cantilever arrays detector and an optical read-out section. The detector
The Mg-delta-doped GaN structure has been grown by Iow-pressure metalorganic chemical vapour deposition.The Hall-effect measurements reveal that the electrical
试验采用中国科学院遗传所创立的棉属种间杂交新技术,即对杂交铃喷(滴)GA_3(5 oppm)、NAA(4 oppm)—离体培养杂种胚—试管内染色体加倍,于1981年获得了陆地棉(科遗181)×比
Diamond-like carbon (DLC) films have been deposited on to Si substrates at substrate temperatures from 25℃to 400 ℃ by a high-intensity pulsed-ion-beam (HIPIB)
We propose a novel approach to visualize the light-induced refractive index changes in photorefractive crystals employing digital holography. The holograms form
请下载后查看，本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.
By analysing the energy spectrum and E2 transition branching ratios, we show that the E(5) symmetry predictions agree well with the experimental data of nucleus
Properties of nuclei 13,15N and 9B are investigated in the relativistic mean-field theory with NLZ and NL3 force parameters. The calculated binding energies are
Available data regarding the nuclear halo candidates are systematically analysed in terms of the asymptotic normalization coefficients measured experimentally.