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Träfflista för sökning "WFRF:(Esmaeilzadeh M) srt2:(2005-2009)"

Search: WFRF:(Esmaeilzadeh M) > (2005-2009)

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  • Valldor, M., et al. (author)
  • Preparation and characterisation of the double perovskite Sr2TaMnO6
  • 2006
  • In: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853 .- 1873-4766. ; 299:1, s. 161-169
  • Journal article (peer-reviewed)abstract
    • The presented compound, Sr2TaMnO6, has a weak, disordered magnetic structure. The metal oxide was prepared under high isostatic oxygen pressure. The doubling of the perovskite structure was proven with electron diffraction and powder neutron diffraction. Combining neutron- and X-ray diffraction data, the room-temperature structure was modelled with the Rietveld method. Both octahedral positions are partially occupied by Mn and Ta, but with different Mn/Ta ratios. AC- and DC-magnetic measurements indicate a magnetic transition at about 17 K and the AC-magnetic susceptibility, both real and imaginary part, is frequency dependent, suggesting that the material has a spin-glass feature. The magnetic spins freeze during a wide temperature range and a possible explanation is a competative situation between the double exchange (ferromagnetism) and the super-exchange (anti-ferromagnetism).
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