Abstract
Well‐formed hexagonal whiskers of (5–10 mm in length and 0.5–25 μm in diameter) were obtained by chemical vapor deposition on a quartz substrate at 850°–1150°C using Au metal as an impurity to promote crystal growth, whereas platelet crystals were obtained at 1250°C using Pd or Pt. The effects of temperature, gas composition, and the kind of impurities on the growth rates were examined. Electrical resistivity and thermoelectric power of whiskers and platelet crystals indicated anisotropy. The tensile strength of whiskers was found to be about 1000 kg/mm2 for 1 μm samples. The whiskers showed a considerable oxidation resistance in air below 1000°C, probably because of the formation of and layers.
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