Abstract
1.Part I: Experimental study Optical and X-ray techniques are used to study the growth morphology of α-Al2O3 filamentary crystals produced by a heterogenous vapor-phase reaction. The results of surveying a large population of specimens reveal the occurrence of specimens with high-index growth axes. The distributions of growth directions in basal and non-basal planes show low-index peaks superposed upon a continuum of high index directions. Chromium-doping modifies the distribution by enhancing non-basal growth. Hexagonal hillocks on the basal plane and rhomboidal ones on the {1120} prism plane serve as indicators of the crystallographic growth axes.2.Part II: Interpretation High-index growth of α-Al2O3 filamentary crystals is interpreted phenomenologically in terms of a non-equilibrium resultant growth velocity. Implications of the observed growth morphology are discussed in terms of various mechanisms and theories.
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