Structural chemistry and spin-glass behaviour of Nd{sub 18}Li{sub 8}Fe{sub 4}TiO{sub 39}
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR (United Kingdom)
- Faculty of Sciences, University of Liege, B-4000 Sart-Tilman (Belgium)
- Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, MO 65409-0010 (United States)
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE (United Kingdom)
Nd{sub 18}Li{sub 8}Fe{sub 4}TiO{sub 39} has been synthesised and characterised by neutron powder diffraction, X-ray absorption spectroscopy, Moessbauer spectroscopy and magnetometry. The cubic structure (Pm3-bar n, a=11.97227(8) A) is based on intersecting Left-Pointing-Angle-Bracket 1 1 1 Right-Pointing-Angle-Bracket chains comprised of alternating octahedral and trigonal-prismatic coordination sites. These chains lie within hexagonal-prismatic cavities formed by a Nd-O framework. The larger of the two crystallographically distinct octahedral sites, 8e, is occupied by iron, titanium and lithium in a ratio of 76:20:4; the smaller, 2a, is occupied by iron and titanium in a ratio of 79:21. The trigonal-prismatic site, 16i, is occupied by lithium and iron in a ratio of 98:2. The cations on the 2a sites are assigned as Ti{sup 4+}and low-spin Fe{sup 4+}, and those on the 16i sites as Li{sup +} and Fe{sup 3+}. The 8e sites are thought to be occupied by Li{sup +}, Fe{sup 3+} and Ti{sup 3+}. Nd{sub 18}Li{sub 8}Fe{sub 4}TiO{sub 39} undergoes a transition to a spin-glass state at 4.25(5) K. - Graphical abstract: Nd{sub 18}Li{sub 8}Fe{sub 4}TiO{sub 39} undergoes a transition to a spin-glass state at 4.25(5) K. Highlights: Black-Right-Pointing-Pointer Spin-glass behaviour in Nd{sub 18}Li{sub 8}Fe{sub 4}TiO{sub 39} below 4.25 K. Black-Right-Pointing-Pointer Application of X-ray absorption spectroscopy to a complex mixed-metal oxide. Black-Right-Pointing-Pointer Mixed-valence cations in Nd{sub 18}Li{sub 8}Fe{sub 4}TiO{sub 39}.
- OSTI ID:
- 22012042
- Journal Information:
- Journal of Solid State Chemistry, Vol. . 187; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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