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High temperature phase transition of the magnetoelectric double perovskite Sr2NiMoO6 by neutron diffraction

AK Eriksson ; Sten G. Eriksson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; SA Ivanov ; Christopher S Knee ; J Eriksen ; H Rundlöf ; M Tssegai
MATERIALS RESEARCH BULLETIN 41 (1): 144-157 JAN 5 2006 (ISSN: 0025-5408 ). Vol. 41 (2006), p. 144-157.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Author Keywords: oxides; neutron scattering; dielectric properties; phase transactions; magnetic structure

Sten Eriksson, Department of Chemical and Biological Engineering, Environmental Inorganic Chemistry, stene@chalmers.se

Denna post skapades 2007-01-30. Senast ändrad 2010-09-08.
CPL Pubid: 26132


Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)



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