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1994 (1)
1Author    U. Pegelow3, M. Winterer2, B. D. Mosel3, M. Schmalzb, R. SchöllhornbRequires cookie*
 Title    Mössbauer Studies of Nickel-Iron Hydrotalcites  
 Abstract    Dedicated to Professor Werner Müller-Warmuth on the occasion of his 65 th birthday Hydrotalcite-like Fe-Ni-hydroxides [Ni2I/3Fe1 1 I/ I3(0H)2](C03)1/6(H20)> ,, [Ni3/4Fe1 1 '/ l4(OH)2]-(C 0 3)1/8(H20)y and [Ni3 //4IFe1 1 I/ '4(OH)2](CO3)0 14(H20)y as well as the ternary oxide NaNi2/3Fe1/30 2 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 assum­ ing uniaxial relaxation. 
  Reference    Z. Naturforsch. 49a, 1200—1206 (1994); received September 26 1994 
  Published    1994 
  Keywords    Mössbauer spectroscopy, Nickel-iron hydrotalcite, Fe(III) high spin, Collective cluster excitations 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1200.pdf 
 Identifier    ZNA-1994-49a-1200 
 Volume    49