Superconducting properties and crystal structures of singlecrystal niobium nitride thin films deposited at ambient substrate temperature Structural investigation of two carbon nitride solids produced by cathodic arc deposition and nitrogen implantation
Nanosized hexagonal wurtzite aluminum nitride (AlN) powders have been synthesized by the direct current
(DC) arc plasma method using mixed gas of ammonia and nitrogen (NH3−N2). The growth of the crystals
is affected by the thermal stability of their nitric surface, and the average size of the particles varies slightly
according to reaction gas pressure. Fourier transform infrared (FT-IR) transmission measurements were carried
out at room temperature on the nanosized powders in different mediums. The IR spectra show an intense
and broad absorption peak at about 770 cm-1 (εm=2.36 of KBr) or 800 cm-1 (εm=1.0 of in air) attributed to
the Fröhlich mode of the nanostructured AlN crystals. Some bulk modes also appear as shoulders or peaks
in the spectra simultaneously.
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