<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>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.</p></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.

A facile synthesizing method of vanadium dioxide by pyrolyzing ammonium metavanadate

Department of Chemical Engineering, Life Science College, Dalian Nationalities University, 18 Laohe West Road, Dalian, 116600, China

Department of Chemical Engineering of Material, School of Chemical Engineering, Dalian University of Technology, 158 Zhongshan Road, Dalian, 116012, China

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

A facile process was developed for synthesizing vanadium dioxide (VO2) by pyrolyzing ammonium metavanadate (NH4VO3) in nitrogen flow. The process was designed...

A facile synthesizing method of vanadium dioxide by pyrolyzing ammonium metavanadate

Publié en ligne: 18 juil. 2012

Pages: 151 - 157

DOI: https://doi.org/10.2478/s13536-012-0010-7

Mots clés
vanadium dioxide, ammonium metavanadate, phase transition, microstructure, pyrogenation

© 2012 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

A facile synthesizing method of vanadium dioxide by pyrolyzing ammonium metavanadate

Publié en ligne: 18 juil. 2012

Pages: 151 - 157

DOI: https://doi.org/10.2478/s13536-012-0010-7

Mots clésvanadium dioxide, ammonium metavanadate, phase transition, microstructure, pyrogenation

© 2012 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
vanadium dioxide, ammonium metavanadate, phase transition, microstructure, pyrogenation