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Zeitschrift für Naturforschung A

A Journal of Physical Sciences

Editor-in-Chief: Holthaus, Martin

Editorial Board: Fetecau, Corina / Kiefer, Claus

12 Issues per year


IMPACT FACTOR 2016: 1.432

CiteScore 2017: 1.30

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Source Normalized Impact per Paper (SNIP) 2017: 0.632

Online
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1865-7109
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Volume 49, Issue 12

Issues

Mössbauer Studies of Nickel-Iron Hydrotalcites

U. Pegelow
  • Institut für Physikalische Chemie der Universität Münster, Schloßplatz 4/7, D-48149 Münster
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ M. Winterer
  • Institut für Physikalische Chemie der Universität Münster, Schloßplatz 4/7, D-48149 Münster
  • Present address: FB Materialwissenschaft, TH Darmstadt, Germany.
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ B. D. Mosel
  • Institut für Physikalische Chemie der Universität Münster, Schloßplatz 4/7, D-48149 Münster
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ M. Schmalzb / R. Schöllhorn
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/zna-1994-1215

Abstract

Hydrotalcite-like Fe-Ni-hydroxides [Ni2/3IIFe1/3III(OH)2](CO3)1/6(H2O)y , [Ni3/4IIFe1/4III(OH)2]-(CO3)1/8(H2O)y and [Ni3/4II/IIIFe1/4III(OH)2](CO3)0.14(H20)y as well as the ternary oxide NaNi2/3Fe1/3O2 have been studied by 57Fe-Mössbauer spectroscopy. All samples contain Fe3+ in a high spin state. The quadrupole interaction is smaller if a magnetic splitting is present, which may indicate a non-parallel arrangement of the principal axis of the EFG and the hyperfine field. The temperature dependence of the spectra has been understood in terms of collective cluster excitations. In this model the magnetic energy of a single domain depends on the direction of the total magnetic moment and on magnetic interaction with the neighbourhood. The spectral lineshape could be fitted assum­ing uniaxial relaxation.

Keywords: Mössbauer spectroscopy; Nickel-iron hydrotalcite; Fe(III) high spin; Collective cluster excitations

About the article

Received: 1994-09-26

Published Online: 2014-06-02

Published in Print: 1994-12-01


Citation Information: Zeitschrift für Naturforschung A, Volume 49, Issue 12, Pages 1200–1206, ISSN (Online) 1865-7109, ISSN (Print) 0932-0784, DOI: https://doi.org/10.1515/zna-1994-1215.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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