Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Abstract

Abstract:In this work, a set of nanoparticles of Nb 2 O 5 nanoparticles were grown by both the Pechini and the sol-gel methods. The amorphous materials were calcined at 650 • C or at 750 • C. X-ray diffraction, scanning electron microscopy, luminescence and Raman spectroscopy were used in order to characterize the materials. From the study, it is possible to state that the method of production of nanoparticles, beyond the temperature of synthesis, has a great influence on whether the phase produced is hexagonal or orthorhombic. Additionally, compared to de Sol-gel method, the Pechini method produced samples with smaller particle sizes. The photoluminescence spectra of niobium pentoxide nanostructure materials show that the emission peaks are positioned between 334 to 809 nm and there is a change of intensity which varies depending on the synthesis route used. High pressure Raman spectra at room temperature were obtained from two samples grown by the sol-gel method. Up to 6 GPa, where it is possible to observe the Raman bands, no modification other than the increase of disorder was observed, and this can be associated with a change of phase.

Study of the Nb2O5 Insertion in ZnO to Dye-sensitized Solar Cells

“…The DRX confirm the production of niobium pentoxide by Pechini method with high crystallinity and free of impurities and the orthorhombic crystalline structure to Nb 2 O 5 , according to PDF 96-210-6535 of ICDD 16,17,18 . In general, the crystallization conditions of each Nb 2 O 5 structure Through analysis of FTIR shown in Figure 2, a band is observed in the region of 832-997 cm -1 that is attributed stretching of the Zn-O band was observed that when Nb 2 O 5 is added that band is shifted and intensified.…”

Effects of metal doping agent on the properties of Nb2−xMxO5 (M = Mn, Fe, and Ni) system

“…The samples were prepared by the polymer precursors method (Pechini method). Aqueous solutions of niobium citrate and metal dopant were prepared following the procedure reported previously in Ref: the metal nitrate at 1% and 2.5% concentrations (manganese nitrate‐Merck, iron nitrate‐Merck and nickel nitrate‐Merk) was completely solubilized in distilled water. Then, niobium chloride (Merck 98%) solubilized in distilled water was incorporated.…”

“…Finally the doping with transition metals using sol-gel method, adding metal in situ has been studied in Ref. 14 15 ; then these compounds were tested in photoinduced processes for the degradation of organic compounds, concluding the favorability of the presence of the dopant.…”

Extraction of non-noble metal columbite-tantalite as a highly efficient electrocatalyst for water splitting

“…The formed white wet cake was washed with deionized water, transferred to a glass beaker, and dried in vacuum oven for 48 h at 135°C (WOCT-135) to ensure that all the organic solvents were removed. The dried cakes were placed in a porcelain crucible for calcination at 1050°C for 3 h in a muffle furnace (WOCT-1050) 61,62 . The annealed grey metal oxide was milled and further used after washing in ethanol and distiller water (WOCT) in this study (photo all the extraction process shown on the Supplementary Fig.…”