Abstract
The formation of tungsten by microwave plasma induced reduction of coarse grade, crystalline (monoclinic and hexagonal blend) WO 3 was investigated. It was observed that nanostructured α-W (cubic; space group: Im-3m) as well as β-W (cubic, space group: Pm-3n) are present in the final product. The fraction of β-W was higher (56 (± 3) wt.%) when compared to α-W (41 (± 4) wt.%). The high resolution scanning electron microscopy revealed narrow size distribution of the as synthesized tungsten with average particle size of about 10–25 nm. The estimated crystallite sizes from the log-normal size distribution obtained from the Warren-Averbach's Fourier treatment of the XRD profile were about 12 (± 3) and 15 (± 2) nm for α and β-W, respectively. The observed particle/crystallite sizes were significantly finer when compared to conventional plasma synthesized tungsten due to lower processing temperature in microwave plasma synthesis technique.
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