MORPHOLOGICAL VARIATIONS IN FLAME-DEPOSITED DIAMOND

An oxy-acetylene flame, impinging vertically upward on an Si(001) subs trate, is systematically examined for morphological variations in the resulting diamond deposits. The flame is operated under near neutral ( O2/CH2 ratio near 1.0) conditions in the unconfined, open atmosphere. Singly twinned crystal morphologies in addition to the usual (001) fac eted structures are observed and reported for the first time. Similar morphological variations are observed along the radial as well as the axial (vertical) coordinate directions in the flame. Large changes in morphology are observed for changes in vertical position as small as 5 0 mum.