Paper Titles

Synthesis, Structure and Properties of Iron-Based Bulk Glass-Forming Metallic Alloys Prepared by Different Processing
p.321

Characterization of Carbon Cryogel Synthesized by Sol-Gel Polycondensation and Freeze-Drying
p.327

Nickel/Silica Precursor from Sodium Silicate Solution - Synthesis and Characterization
p.333

The Influence of Acid Treatment on the Nanostructure and Textural Properties of Bentonite Clays
p.339

Reduction of NiO-WO₃ Oxide Mixtures Synthesized by Gel-Combustion Technique: A Route to Ni-W Alloys
p.345

Synthesis and Characterization of Ammonium Decavanadate (V)
p.351

Structural Characterization of Poly(o-Tolidine)
p.357

Characterization and Catalytic Activity of Poly(4-Vinylpyridine-Co-Divinylbenzene)-Co²⁺ Complex
p.363

Examinations of Cross-Linked Polyvinylpyridine in Open Reactor
p.369

HomeMaterials Science ForumMaterials Science Forum Vol. 494Reduction of NiO-WO3 Oxide Mixtures Synthesized by...

Reduction of NiO-WO₃ Oxide Mixtures Synthesized by Gel-Combustion Technique: A Route to Ni-W Alloys

Article Preview

Abstract:

The mixtures NiO-WO3 were synthesized by the combustion of gels obtained by drying common solutions of nickel nitrate, polytungstic acid and citric acid. The X-ray diffractograms of oxide mixtures confirmed mutual interaction of oxides during synthesis leading to a new phase, NiWO4. The reduction of oxide mixtures in hydrogen atmosphere was investigated thermogravimetrically. The temperature of reduction of the oxide mixture lies between the temperatures of reduction of pure oxides and monotonously increases with the increase in WO3 mole fraction; however, the reduction itself is a multi-step process, preferably in the composition region rich in NiO. The X-ray diffractometry of metallic residues evidenced Ni-W alloys and tungsten excess to be the reduction products.

You might also be interested in these eBooks

Current Research in Advanced Materials and Processes

Info:

Periodical:

Materials Science Forum (Volume 494)

Pages:

345-350

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.494.345

Citation:

Cite this paper

Online since:

September 2005

Authors:

S. Mentus, D.M. Majstorović, B.S. Tomić, R. Dimitrijević

Keywords:

Gel-Combustion, NiO-WO₃, Ni-W Alloy, Oxide Mixture, Oxide Reduction, Thermo-Gravimetry (TG)

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2005 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

[1] L.R. Pederson, G.D. Maupin, W.J. Weber, D.J. McReady, R.W. Stephens, Mat. Lett. 10 (1991), p.437.

[2] J. Huang, H. Zhuang, WenLan Li, Mat. Res. Bull. 38 (2003), p.149.

[3] R.V. Mangalaraja, S. Ananthakumar, P. Manohar, F.D. Gnanam, Mat. Lett. 57 (2003), p.1151.

[4] X. -H. Wang, L.L.Z. Gui, S. Shu, J. Zhou, Mat. Chem. Phys. 77 (2002), p.248.

[5] D. Jugovic, N. Cvjeticanin, V. Kusigerski, S. Mentus, J. Optoelectronics and Advanced Materials, 5 (2003), p.343.

[6] Z. Jiao, M. Wu, Z. Qin, H. Xu, Nanotechnology, 14 (2003), p.458.

[7] Y. Yoshimura, T. Sato, H. Shimada, N. Matsubayashi, M. Imamura, A. Nishijima, M. Higo, S. Yoshitomi, Catalysis Today, 29 (1996), p.221.

DOI: 10.1016/0920-5861(95)00275-8

[8] J.A. Rodriguez, J.C. Hanson, A.I. Frenkel, J.Y. Kim, M. Perez, J. Am. Chem. Soc. 124 (2002), p.346.

[9] J.T. Richardson, R. Scates, M.V. Twigg, Appl. Phys. A: General 246 (2003), p.137.

[10] H. Okamoto, A. Ishikawa, Appl. Phys. Letters, 55 (1989), p.19239.

[11] H. -J. Kim, J. -H. Lee, I. -H. Sohn, T. -J. Hwang K. -Y. Lee, Korea_Australia Rheology Journal 14 (2002), p.71.

[12] S. Sridar, D. Sichen, S. Seetharaman, Metall. Mater. Trans. B, 25B (1994), p.391.

[13] J.A. Bustnes, D. Sichen, S. Seetharaman, Metall. Mater. Trans. B, 26B (1995), p.547.

[14] R. Morales, Scan. J. Metallurgy 32 (2003), p.263.

[15] S. Yao, S. Zhao, H. Gao, M. Kowaka, Corrosion, 53 (1966), p.183.

[16] L. Zhu, O. Younes, N. Ashkenasy, Y. Shacham-Diamond, E. Gileadi, Appl. Surface Science 200 (2002), p.1.

[17] Powder Diffraction File, Joint Committee on Powder diffraction, International Center for Diffraction Data, Swarthmore, PA, (1987).

[18] K.E. Poulsen, S. Rubek, E.W. Langer, Scripta Metallurgica, 8 (1974), p.1297.

[19] J.M. Waalsh, M.J. Donachie, J.R., Metall. Trans. 4 (1973), p.2854.

[20] M.M. Jaksic, Electrochim. Acta, 45 (2000), p.4085.