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A facile synthesizing method of vanadium dioxide by pyrolyzing ammonium metavanadate Cover

A facile synthesizing method of vanadium dioxide by pyrolyzing ammonium metavanadate

By: J. Qi,  G. Ning,  R. Hua,  M. Tian and  S. Liu  
Open Access
|Jul 2012

Abstract

A facile process was developed for synthesizing vanadium dioxide (VO2) by pyrolyzing ammonium metavanadate (NH4VO3) in nitrogen flow. The process was designed on the base of thermodynamic modeling of chemical reaction and thermal analyzing of NH4VO3 pyrogenation in N2 gas, and optimized by experiments. X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) were applied to characterizing the product VO2. Thermo-gravimetric analysis (TG) and DSC were used for analyzing the process of NH4VO3 pyrogenation. The experimental results indicated that VO2 microcrystal particles were successfully synthesized. The product VO2 presents two kinds of micro morphologies, torispherical and pentagonal prism. The phase transition mainly takes place at 338.4 K and 341.9 K. The average enthalpy of the phase transition is 28.82 J/g.

DOI: https://doi.org/10.2478/s13536-012-0010-7 | Journal eISSN: 2083-134X | Journal ISSN: 2083-1331
Language: English
Page range: 151 - 157
Published on: Jul 18, 2012
Published by: Wroclaw University of Science and Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2012 J. Qi, G. Ning, R. Hua, M. Tian, S. Liu, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.