Abstract
Niobium(V) alkoxides were directly prepared in a undivided electrolytic cell by using niobium metal as sacrificing anode, then niobium(V) alkoxides were directly hydrolyzed to gel-like deposits. The phase transformation of the gel-like product by heat treatments resulted in the formation of porous niobium pentoxide. IR, TG-DSC, XRD and SEM were used to characterize the structure of porous Nb2O5 and the gel-like products. Studies show that amorphous Nb2O5 secondary particles change into orthorhombic phase and form 2 μm spherical particles after calcination at 873 K. While monoclinic Nb2O5 is obtained after calcination at 1 173 K, the porous Nb2O5 with pore size of about 250 nm is finally formed following the phase transformation of spherical Nb 2O5 particles into rod like particles.
Original language | English |
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Pages (from-to) | 1812-1815 |
Number of pages | 4 |
Journal | Chinese Journal of Inorganic Chemistry |
Volume | 24 |
Issue number | 11 |
State | Published - Nov 2008 |
Keywords
- Niobium pentoxide, porous structure
- Niobium(V) alkoxides
- Phase transformation