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Structural chemistry and spin-glass behaviour of Nd18Li8Fe4TiO39

DOI: 10.1016/j.jssc.2011.12.029 DOI Help

Authors: Nirawat Thammajak (University of Oxford) , Peter D. Battle (University of Oxford) , Fernande Grandjean (University of Liège) , Gary J. Long (University of Missouri) , Silvia Ramos (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Solid State Chemistry , VOL 187

State: Published (Approved)
Published: January 2012

Abstract: Nd18Li8Fe4TiO39 has been synthesised and characterised by neutron powder diffraction, X-ray absorption spectroscopy, Mössbauer spectroscopy and magnetometry. The cubic structure (Pm3?n, a=11.97227(8) Å) is based on intersecting ?1 1 1? 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 Ti4+and low-spin Fe4+, and those on the 16i sites as Li+ and Fe3+. The 8e sites are thought to be occupied by Li+, Fe3+ and Ti3+. Nd18Li8Fe4TiO39 undergoes a transition to a spin-glass state at 4.25(5) K.

Journal Keywords: Absorption Spectroscopy; Cations; Cubic Lattices; Iron; Iron Ions; Lithium; Moessbauer Effect; Neutron Diffraction; Oxides; Spin Glass State; Titanium; X-Ray Spectroscopy

Subject Areas: Chemistry, Materials

Instruments: B18-Core EXAFS

Other Facilities: D2b at ILL

Added On: 10/01/2012 10:50

Discipline Tags:

Chemistry Materials Science Inorganic Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) X-ray Absorption Near Edge Structure (XANES)