Abstract
Oriented (100) and (111) polycrystalline diamond has been achieved without graphite formation. Nucleation is beleived to occur from a Ni-C-H molten surface layer on oriented, metastable, cubic Ni4C previously nucleated on similarly oriented single crystal Ni substrates. The incorporation of the atomic H lowers the eutectic melting point of the Ni-C system from 1325°C to the 900-1000°C range and also promotes the nucleation of the Ni4C. X-ray diffraction analysis revealed that the Ni4C occurs only between the diamond particles and the Ni substrate.
© 1995 Optical Society of America
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