02406nas a2200265   4500008004100000022001400041245016100055210006900216260006900285300001200354490000700366520141600373653001701789653002101806653002701827653001301854100002301867700002301890700001801913700001701931700002001948700002001968700002401988856012802012       2005                        eng d  a0925-963500aGradual transitions in morphology of diamond films grown by using N-2 admixtures of CH4+H-2 gas in a hot filament assisted chemical vapour deposition system0 aGradual transitions in morphology of diamond films grown by usin  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcFEB  a232-2420 v143 a<p>A study of the evolution of morphology of diamond films grown as a function of N-2 gas additions to the CH4+H-2 precursor in an HF-CVD system is presented. With the increase of admixture of N2 fraction, in contrast to earlier studies, the morphology was observed first to gradually change from {111}-faceted crystallites texture to that of an intermediate cubo-octahedral crystallite texture and then gradually but finally to transform completely into that of {100}-faceted crystallites. The threshold nitrogen concentration, [N-2](thr), required to bring about the said transition in morphology was much larger than it was reported previously. Moreover, the morphology transition required a larger [N-2](thr) when a large fraction of methane was employed. Further additions of nitrogen, that just exceeded the [N-2](thr), resulted in growth of films containing slightly bigger {100}-multi-layered grains or isolated planar {100}-platelets. For extremely large nitrogen additions, the growth of nanocrystalline or amorphous carbon films was observed. The N-2 additions more than 50 vol.% did not yield any deposition. Raman scattering and photoluminescence measurements were used respectively for characterizing the quality and nitrogen doping in the films. These results are attributed to the possible catalytic role of atomic nitrogen at the growing surface. (C) 2005 Elsevier B.V. All rights reserved.</p>10adiamond film10ahot filament CVD10amorphology transitions10anitrogen1 aKshirsagar, S., T.1 aKshirsagar, R., B.1 aPatil, P., S.1 aKulkarni, A.1 aMandate, A., B.1 aGaikwad, A., B.1 aGokhale, Suresh, P.  uhttps://library.ncl.res.in/content/gradual-transitions-morphology-diamond-films-grown-using-n-2-admixtures-ch4h-2-gas-hot-1