Abstract
Spherical particles of transition metal oxides (vanadium oxide, manganese oxide and iron oxide) were formed by the use of O2-H2 flame fusion and the effect of varying raw material on the product particles was investigated. Particles ranging in size from 50 to 0.01 μm were produced simultaneously by explosive decomposition of raw material which is composed of higher valent metal ions, and melting to give V2O5 → V2O4 +\(\tfrac{1}{2}\)O2; Mn2O3 → 2MnO +\(\tfrac{1}{2}\)O2; and 3Fe2O3 → 2Fe3O4 +\(\tfrac{1}{2}\)O2. During cooling from the molten state particles were reoxidized completely or partially (in the surface layer) into V2O5, Mn3O4 and Fe2O3, respectively, depending upon the particle size. A cavity was observed electron microscopically in the smaller V2O5 particles, while fine single crystal (exactly polyhedral but almost spherical) particles of Mn3O4 and Fe3O4 were obtained. The isoelectric points of spherical Mn3O4, Fe3O4 and Fe2O3 particles were determined to be 4.0, 5.1 and 5.1, respectively.
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