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

Annika K. Eriksson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
Materials Research Bulletin 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¯3m) 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 ground state. The magnetic moment was refined to 1.88(8) mB confirming that the magnetism originates from the Ni2+ (S = 1) ions.

Nyckelord: Oxides, Neutron Scattering, Dieletric properties, Phase transactions, Magnetic structure



Denna post skapades 2009-02-02.
CPL Pubid: 89518

 

Institutioner (Chalmers)

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

Ämnesområden

Fasta tillståndets kemi

Chalmers infrastruktur