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See detailStructural Chemistry and Spin-glass Behaviour of Nd18Li8Fe4TiO39
Thammajak, N; Battle, Peter D.; Grandjean, Fernande ULg et al

in Journal of Solid State Chemistry (2012), 187

Nd18Li8Fe4TiO39 has been synthesised and characterised by neutron powder diffraction, X-ray absorption spectroscopy, Mossbauer spectroscopy and magnetometry. The cubic structure (Pm3 n, a=411.97227(8) Å ... [more ▼]

Nd18Li8Fe4TiO39 has been synthesised and characterised by neutron powder diffraction, X-ray absorption spectroscopy, Mossbauer spectroscopy and magnetometry. The cubic structure (Pm3 n, a=411.97227(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. [less ▲]

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See detailMagnetic Ordering in Nitrides with the η-Carbide Structure: (Ni,Co,Fe)2(Ga,Ge)Mo3N
Sviridov, A; Battle, Peter D.; Grandjean, Fernande ULg et al

in Inorganic Chemistry (2010), 491

Compositions in the series Ni2-xCoxGeMo3N (0 ex e2),Co2Ge1-xGaxMo3N (0<x e0.7),Co2-xFexGeMo3N (0 e x e 2), and Co2-xFexGe0.5Ga0.5Mo3N (0 e x e 0.8) have been synthesized by the reductive nitridation of ... [more ▼]

Compositions in the series Ni2-xCoxGeMo3N (0 ex e2),Co2Ge1-xGaxMo3N (0<x e0.7),Co2-xFexGeMo3N (0 e x e 2), and Co2-xFexGe0.5Ga0.5Mo3N (0 e x e 0.8) have been synthesized by the reductive nitridation of binary oxides and studied by appropriate combinations of magnetometry, transport measurements, neutron diffraction, and M€ossbauer spectroscopy. All of these compositions adopt the cubic η-carbide structure (a ∼ 11.11 A ̊ ) and show a resistivity of ∼10 -3 Ω cm. No long-range magnetic order was observed in Ni 2-xCoxGeMo3N, although evidence of spin freezing was observed in Co2GeMo3N. The introduction of gallium into this composition leads to the onset of antiferromagnetic ordering at 90 K in Co2Ge0.3Ga0.7Mo3N. The magnetic structure consists of an antiferromagnetic arrangement of ferromagnetic Co4 groups, with an ordered magnetic moment of 0.48(9) μB per cobalt atom. The same magnetic structure is found in Co0.5Fe1.5GeMo3N and Co1.2Fe0.8Ge0.5Ga0.5Mo3N. The former orders above room temperature with an average moment of 1.08(3) μB per transition-metal site, and the latter at 228 K with an average moment of 1.17(4) μB per site. The magnetic behavior of these compounds is discussed in terms of the electron count within each series. [less ▲]

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See detailStructural and magnetic properties of Pr18Li8Fe5-xMxO39 (M = Ru, Mn, Co)
Dutton, Sian E; Battle, Peter D; Grandjean, Fernande ULg et al

in Journal of Solid State Chemistry (2009), 182(7), 1638-1648

A polycrystalline sample of Pr18Li8Fe4RuO39 has been synthesized by a solid state method and characterized by neutron powder diffraction, magnetometry and Mossbauer spectroscopy; samples of Pr18Li8Fe5 ... [more ▼]

A polycrystalline sample of Pr18Li8Fe4RuO39 has been synthesized by a solid state method and characterized by neutron powder diffraction, magnetometry and Mossbauer spectroscopy; samples of Pr18Li8Fe5-xMxO39 and Pr18Li8Fe5-xCoxO39 (x = 1, 2) have been studied by magnetometry. All these Compounds adopt a cubic structure (space group Pm (3) over barn, a(o)similar to 11.97 angstrom) based on intersecting < 111 > chains made up of alternating octahedral and trigonal-prismatic coordination sites. These chains occupy channels within a Pr-O framework. The trigonal-prismatic site in Pr18Li8Fe4RuO39 is occupied by Li+ and high-spin Fe3+. The remaining transition-metal cations occupy the two crystallographically-distinct octahedral sites in a disordered manner. All five compositions adopt a spin-glass-like state at 7 K (Pr18Li8Fe4RuO39) or below. (C) 2009 Elsevier Inc. All rights reserved. [less ▲]

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See detailStructural Chemistry and Magnetic Properties of Nd18Li8Fe5-xMxO39 (M = Mn, Co),
Dutton, S. E.; Battle, Peter D.; Grandjean, Fernande ULg et al

in Inorganic Chemistry (2009), 48

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