Interface between metallic film from Fe-Ni-C system and HPHT as-grown diamond single crystal

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ÂÛÎÄ×÷ÕߣºÐí±ó Àîľɭ ÒüÁúÎÀ ´Þ½¨¾ü ¹¬½¨ºì

ÎÄÕÂÒ³Â룺902 - 906

Key words£ºFe-Ni-C alloy; synthetic diamond; metallic film; interface

Abstract: Microstructures of surface layer (near diamond) of the metallic film from Fe-Ni-C system are composed of (Fe,Ni)₃C,(Fe,Ni)₂₃C₆and ¦Ã-(Fe,Ni), from which it can be assumed that graphite isn¬ðt directly catalyzed into diamond through the film and there exists a transition phase (Fe,Ni)₃C that can decompose into diamond structure. AFM morphologies on the film/diamond interface are traces preserved after carbon groups moving from the film to diamond. The morphologies on the as-grown diamond are similar to those on corresponding films, being spherical on (100) face and sawtooth-like steps on (111) face. Diamond growth rates and temperature gradients in boundary layer of the molten film at HPHT result in morphology differences.