We describe two inherently scaleable geometries for chemical‐vapor‐deposition and heat‐transfer processes that are based on stagnation flows. The ‘‘coflow’’ and ‘‘trumpet‐bell’’ designs result in radially uniform fluxes to surfaces and they optimize the use of reagents. Using a trumpet‐bell burner, we have grown uniform films of diamond from a substrate‐stabilized flat flame of C2H2/H2/O2.
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The diamond film remained firmly attached to the substrate during cooling, resulting in compressive stress from the differential thermal contraction of the substrate and the film. Thus the diamond phonon is upshifted from the natural-diamond value of In addition, the phonon has a pronounced shoulder at about suggesting a substantial stress gradient through the film. Different substrate preparation resulted in delaminated films with the diamond phonon at and a phonon linewidth (FWHM) indicating very high quality diamond.
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The broad peak centered around is luminescence, as established using 514.5-nm excitation.
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© 1993 American Institute of Physics.
1993
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