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Sökning: WFRF:(Tssegai M)

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1.
  • Eriksson, Annika, 1975, et al. (författare)
  • High temperature phase transition of the magnetoelectric double perovskite Sr2NiMoO6 by neutron diffraction
  • 2006
  • Ingår i: Materials Research Bulletin. - 0025-5408. ; 41, s. 144-157
  • Tidskriftsartikel (refereegranskat)abstract
    • The magnetic ferroelectric double perovskite Sr2NiMoO6 has been characterised using neutron powder diffraction (NPD) data and magnetic susceptibility measurements. High temperature NPD data indicate that the material undergoes a continuous structural phase transition from tetragonal (I4/m) to cubic (Fm(3) over barm) at approximately 550 K. The transition is linked to the level of rotation of the NiO6 and MoO6 octahedra, which form perfectly segregated sub-lattices in the material. The reduction in symmetry at 550 K is linked to the onset of a spontaneous dipole in the material allowing the structural perturbation to be described as an improper ferroelectric phase transition. The appearance of low angle reflections in the 20 K dataset indicates the presence of an antiferromagnetic ordered around state. The magnetic moment was refined to 1.88(8) mu(B) confirming that the magnetism originates from the Ni2+ (S = 1) ions. (C) 2005 Elsevier Ltd. All rights reserved.
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2.
  • Ivanov, SA, et al. (författare)
  • Structural and magnetic study of magnetoelectric perovskite Sr2CoMoO6
  • 2006
  • Ingår i: ZEITSCHRIFT FUR KRISTALLOGRAPHIE 537-542 Part 2 Suppl. 23, 2006. ; :2, s. 537-542
  • Tidskriftsartikel (refereegranskat)abstract
    • A study of the crystal and magnetic structure of the double perovskite Sr2CoMoO6 has been carried out on a polycrystalline sample using neutron diffraction (NPD) data between 10-700K. An analysis of NPD patterns at 295K has shown that this compound crystallizes in the tetragonal space group 14/m with a = 5.5616(l) and c = 7.9470(2) angstrom and has a 1:1 ordered arrangement of the B-sites. This compound undergoes a 14/m -> Fm3m improper ferroelectric phase transition near 563 K. A low-temperature antiferomagnetic ordering (below T-N = 37 K) has been followed from a sequence of low-temperature NPD data sets. The magnetic structure is defined by the propagation vector (k) over right arrow = (1/2,0,1/2). Alongside the obtained experimental results on magnetic and electric properties some aspects of magnetoelectricity in this perovskite is also discussed.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Eriksson, Sten, 1958 (2)
Ivanov, SA (2)
Rundlöf, H (2)
Tssegai, M (2)
Eriksen, J (1)
Knee, Christopher, 1 ... (1)
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Tellgren, R (1)
Eriksson, Annika, 19 ... (1)
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Chalmers tekniska högskola (2)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)
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2006 (2)

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