Hostname: page-component-848d4c4894-5nwft Total loading time: 0 Render date: 2024-05-19T07:14:50.845Z Has data issue: false hasContentIssue false
  • English
  • Français

Adsorption of H2O, H2S, and N2 on MnZn ferrite

Published online by Cambridge University Press:  31 January 2011

M. A. H. Donners ,
J. W. Niemantsverdriet  and
G. de With
M. A. H. Donners
Affiliation:
Laboratory for Solid State and Materials Chemistry, Eindhoven University of Technology, pob 513, 5600 MB Eindhoven, The Netherlands
J. W. Niemantsverdriet
Affiliation:
Schuit Institute of Catalysis, Eindhoven University of Technology, pob 513, 5600 MB, Eindhoven, The Netherlands
G. de With*
Affiliation:
Laboratory for Solid State and Materials Chemistry, Eindhoven University of Technology, pob 513, 5600 MB Eindhoven, The Netherlands
*
b)Address all correspondence to this author.
Get access

Abstract

MnZn ferrites show extensive subcritical crack growth. In this process water plays an important role. The fracture surfaces of MnZn ferrites with three different stoichiometries were investigated with adsorption isotherm measurements, temperature-programmed desorption, diffusive reflection infrared Fourier transform spectroscopy (DRIFT), low-energy ion spectroscopy (LEIS), and x-ray photoelectron spectroscopy (XPS). The XPS results confirmed the presence of Mn, Zn, Fe, and O atoms in the surface region, but LEIS indicated that the outer layer of the fracture surfaces contained no Zn atoms. DRIFT confirmed that hydroxyl groups were present on the fracture surfaces. Experiments with H2S, for which the XPS is more sensitive, indicated that at low coverage pairs of S atoms bridge a pair of Fe atoms. With increasing coverage the S bridge shifts to one Fe atom while at the highest coverage each Fe atom is bonded to one S atom. In experiments with N2 the highest nitrogen absorption is found for the lowest oxygen concentration in the ferrite, which is probably related to the polarity of the surface. Both the adsorption and desorption tests indicated that N2 had a larger adsorption affinity to MnZn ferrite surfaces than H2O.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 12 , December 2000 , pp. 2730 - 2736
Copyright
Copyright © Materials Research Society 2000

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Lessof, H., J. Am. Ceram. Soc. 54, 353 (1971).Google Scholar
2.Beauchamp, E. and Monroe, S.L., J. Am. Ceram. Soc. 72, 1179 (1989).CrossRefGoogle Scholar
3.Kadouch, O., Lambelin, J.P., and Ansart, J.P., Ferrites: Proceedings of The Sixth International Conference on Ferrites (ICF 6) (Japan Society of Powder and Powder Metallurgy, Tokyo, Japan, 1992), p. 839.Google Scholar
4.Donners, M., Dortmans, L., de With, G., and de Graaf, M., J. Eur. Ceram. Soc. 17, 1591 (1997).Google Scholar
5.de With, G., Silic. Ind. 9, 185 (1984).Google Scholar
6.Donners, M., Dortmans, L., and de With, G., J. Mater. Res. 15, 1377 (2000).Google Scholar
7.Data Handbook, Soft Ferrites, MA 01 (Philips Components, Eindhoven, The Netherlands, 1998).Google Scholar
8.Weibel, E.R., Stereological Methods (Academic Press, London, United Kingdom, 1979–1980).Google Scholar
9.Niemantsverdriet, J.W., Spectroscopy in Catalysis—An introduction (VCH, Weinheim, Germany, 1993).Google Scholar
10.Moulder, J.F., Sickle, W.F., and Sobol, P.E., Handbook of X-ray Photoelectron Spectroscopy, (Perkin-Elmer, Eden Prairie, MN, 1992).Google Scholar
11.Brongersma, H.H. and Jacobs, J.-P., Appl. Surf. Sci. 75, 133 (1994).CrossRefGoogle Scholar
12.Alvarez, L.J., Sänchez-Sánchez, J.E., Fernández Sanz, J., and Odriozola, J.A., 3rd UNAM-CRAY Supercomputing Conference (Cambridge University Press, Cambridge, United Kingdom, 1996).Google Scholar
13.Jacobs, J.P., Malta, A., Reintjes, J.G.H, Drimal, J., Ponec, V., and Brongersma, H.H., J. Catal. 147, 294 (1994).Google Scholar
14.Metselaar, R., Reenis, R., Chen, M., Gorter, H., and Hintzen, H.T., J. Eur. Ceram. Soc. 15, 1079 (1995).Google Scholar
15.Chen, M., van Rutten, J.W.T., and Metselaar, R., Proceedings of the Third Euro-Ceramics (Faeuza Éditrice Ibérica, 1993), Vol. 1, 597.Google Scholar
16.Brunauer, S., The Adsorption of Gases and Vapours (Princeton University Press, Princeton, NJ, 1945), Vol. 1.Google Scholar
17.Langmuir, I., J. Am. Chem. Soc. 38, 2221 (1916); 40, 1361 (1918).CrossRefGoogle Scholar
18.Swallow, D. and Jordan, A., Proc. Brit. Ceram. Soc. 2, 1 (1964).Google Scholar
19.Sing, K.S.W and Swallow, D., Proc. Brit. Ceram. Soc. 5, 39 (1965).Google Scholar
20.Weber, Th., Muijsers, J.C., van Wolput, J.H.M.C., Verhagen, C.P.J, and Niemantsverdriet, J.W., J. Phys. Chem. 100, 14144 (1996).CrossRefGoogle Scholar