Abstract
Submicrometer vanadium carbide (V8C7) can be synthesized from V2O5 encapsulated in phenol resin. The precursor powders were produced by coating V2O5 powders with phenolic resin shells. Then the precursor powders were roasted at various temperatures from 1173K to 1473K for 2h in a flowing Ar atmosphere. The decomposed carbon from phenolic resin could be used to reduce V2O5. The samples obtained with different conditions were characterized by X-ray diffraction (XRD), Field-emission scanning electron microscope (FE-SEM), Transmission Electron Microscope (TEM), and Energy Disperse Spectroscopy (EDS). The results show that phase evolution sequences from V2O5 are V2O5→VO2→V2O3→V6C5→V8C7. The single phase of V8C7 can be prepared as the molar ratio of V2O5 to phenol resin is 1:1.2 at the temperature higher than 1373K. The prepared V8C7 particles are about 300nm in size.
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