Abstract
In this work, a set of nanoparticles of Nb2O5 nanoparticles were grown
by both the Pechini and the sol-gel methods. The amorphous materials
were calcined at 650 degrees C or at 750 degrees 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.
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