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

Departamento de Física, Facultad de Ciencias, Universidad Nacional de Colombia-Bogotá, Carrera 30 Calle 45-03, C.P. 111321 Bogotá, Colombia
Departamento de Física, Universidad Francisco de Paula Santander Cúcuta, Avenue Gran Colombia # 12E-96, 540001 Cúcuta, Colombia
Departamento de Física, Universidade Federal do Ceará, C.P. 6030 Fortaleza-CE, Brazil
Author to whom correspondence should be addressed.
Academic Editor: Byungmin Ahn
Metals 2017, 7(4), 142;
Received: 27 March 2017 / Revised: 10 April 2017 / Accepted: 13 April 2017 / Published: 19 April 2017
(This article belongs to the Special Issue Synthesis and Properties of Bulk Nanostructured Metallic Materials)
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 #xB0;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. View Full-Text
Keywords: nanoparticles; sol-gel; photoluminescence; Raman; pressure nanoparticles; sol-gel; photoluminescence; Raman; pressure
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MDPI and ACS Style

Joya, M.R.; Barba Ortega, J.J.; Raba Paez, A.M.; Da Silva Filho, J.G.; Cavalcante Freire, P.D.T. Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry. Metals 2017, 7, 142.

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