Electron microscopic and diffraction study on the progress of reduction of tungsten trioxide
Some papers have been published concerning the particle size of tungsten powder prepared by hydrogen reduction of tungsten oxide (1, 2), and also some work has been done on the mechanism of the reduction process (3), but they are seldom concerned with the morphological change in tungsten oxide crystals in the course of reduction. What Hermann and Pfisterer (4) did observe in their electron microscopical studies, is only the difference in shape between a few particles taken from a lot of the original oxide powder and those from a lot of the reduced powder, but not the change in shape of a single particle by reduction.
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