Abstract
It is shown that metallic needle crystals grow on electron emitting areas of field emission cathodes working in Mo(CO)6 vapor. The growth is driven by ions impinging from a field emission arc plasma, and the products are classified into two categories depending on the thermal energy supplied externally to the substrate: 1) Mo particles are agglomerated in dendritic shapes at ∼ 300-1300 K, and 2) whisker-like crystals with an unknown structure are obtained at ∼ 1300-1500 K. The high-temperature needles are capped with Taylor cones during the growth, and it is shown that they are a metastable phase of Mo.
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References
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ASTM card, 4-809
F. Okuyama: To be published
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