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Morphology and Crystallography of Aluminum Nitride Whiskers
Author(s) -
Caceres Pablo G.,
Schmid Herbert K.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb07255.x
Subject(s) - whiskers , whisker , materials science , carbothermic reaction , monocrystalline whisker , planar , morphology (biology) , nitride , branching (polymer chemistry) , crystallography , cleavage (geology) , substrate (aquarium) , aluminium , composite material , nanotechnology , chemical engineering , chemistry , layer (electronics) , fracture (geology) , carbide , computer graphics (images) , oceanography , biology , computer science , engineering , genetics , geology
Highly pure and dense AIN whiskers were produced by carbothermal reaction of an alumina and a carbon source at 1800°C under flowing nitrogen. The whiskers grew via a VLS mechanism where there is a strong interaction between the liquid catalyst and the substrate/support, resulting in a complete lack of droplets at the whisker tips. The whiskers can be described as long and straight single crystals, free of planar defects, having a diameter of 2–30 μm and a length of 0.5–10 cm. They exhibited two different morphologies, planar and serrated. SADPs indicate that their lateral surfaces fall in a great circle of a stereographiv projectiov, joining two pyramidal poles such as the ( 1 101)–(10 1 1). It is suggested that branching in these whiskers occurs by keeping active one of the pyramidal planes and activating a new one.