Cowin, Peter I. and Lan, Rong and Zhang, Lei and Petit, Christophe T. G. and Kraft, Arno and Tao, Shanwen (2011) Study on conductivity and redox stability of iron orthovanadate. Materials Chemistry and Physics, 126 (3). pp. 614-618. ISSN 0254-0584Full text not available in this repository. (Request a copy from the Strathclyde author)
FeVO4 was synthesised by conventional solid state technique. Impedance measurements using a silver electrode were unsuccessful due to a solid state reaction between FeVO4 and Ag, forming alpha-AgVO3 and alpha-Fe2O3 at the interface. Impedance measurements, with a platinum electrode, reaffirmed that FeVO4 exhibits semiconductor behaviour in air. In a reducing atmosphere, 5% H-2/Ar, high electronic conductivity, from 1 S cm(-1) at 300 degrees C to 2 S cm(-1) at 700 degrees C, was observed with an activation energy of 0.13(1) eV. X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry data determined that the change in electronic conductivity was due to the degradation of the material into FeV2O4 and alpha-Fe2O3. It is believed that the conduction was due to electron hopping between vanadium d-orbitals. Neither FeVO4 nor FeV2O4 are deemed suitable as anode materials for solid oxide fuel cells, due to redox instability.
|Keywords:||ceramics, electronic materials, inorganic compounds, oxide, powder diffraction, oxide fuel cells, electrochemical properties, electrical conductivity, oxidation, systen, temperature, anode, performance, transition, Chemical engineering, Materials Science(all), Condensed Matter Physics|
|Subjects:||Technology > Chemical engineering|
|Department:||Faculty of Engineering > Chemical and Process Engineering|
|Depositing user:||Pure Administrator|
|Date Deposited:||19 Oct 2011 11:45|
|Last modified:||04 Nov 2016 03:44|