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High temperature ph...
High temperature phase transition of the magnetoelectric double perovskite Sr2NiMoO6 by neutron diffraction
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- Eriksson, Annika, 1975 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Eriksson, Sten, 1958 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Ivanov, SA (författare)
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Knee, Christopher, 1973 (författare)
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Eriksen, J (författare)
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Rundlöf, H (författare)
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Tssegai, M (författare)
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(creator_code:org_t)
- 2006
- 2006
- Engelska.
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Ingår i: Materials Research Bulletin. - 0025-5408. ; 41, s. 144-157
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Nyckelord
- neutron scattering
- phase transactions
- dielectric properties
- magnetic structure
- Author Keywords: oxides
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- art (ämneskategori)
- ref (ämneskategori)
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