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Main Title: Mössbauer Studies of Nickel-Iron Hydrotalcites
Author(s): Pegelow, U.
Winterer, M.
Mosel, B. D.
Schmalz, M.
Schöllhorn, R.
Type: Article
Language Code: en
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.
Issue Date: 1994
Date Available: 10-Nov-2018
DDC Class: 530 Physik
Subject(s): Mössbauer spectroscopy
nickel-iron hydrotalcite
Fe(III) high spin
collective cluster excitations
Journal Title: Zeitschrift für Naturforschung A
Publisher: De Gruyter
Publisher Place: Berlin
Volume: 49
Issue: 12
Publisher DOI: 10.1515/zna-1994-1215
Page Start: 1200
Page End: 1206
EISSN: 1865-7109
ISSN: 0932-0784
Appears in Collections:Inst. Chemie » Publications

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