The ferrimagnetic structure of Fe2Mo3O12: dependence of Fe–O–O–Fe supersuperexchange couplings on geometry

Ehrenberg, Helmut; Bramnik, Kirill G.; Muessig, E.; Buhrmester, Thorsten; Weitzel, H.; Ritter, C.

doi:10.1016/s0304-8853(02)01404-x

Cited by 17 publications

(8 citation statements)

References 4 publications

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“…The magnetic structures of more such network structures need to be determined in order to elucidate the magnetic interactions and to allow for an explanation of the rather high magnetic ordering temperature in the light of the long Fe-Fe distances. The results support the relevance of long-range magnetic exchange interactions mediated by AgO-polyhedra as already previously concluded for NaO-polyhedra in closely related compounds [2,18]. The three times higher temperature of the maximum in the temperature dependence of magnetization M(T) for a-AgFe 2 (MoO 4 ) 3 (21.5 K) in comparison with isostructural a-NaFe 2 (MoO 4 ) 3 (7 K) gives evidence for a stronger coupling effect by Ag ions than via Na ions.…”

Section: F/afsupporting

confidence: 90%

“…This empirical rule has been observed for numerous supersuperexchange couplings, e.g. between Mn 2þ ions in MnWO 4 [15] and a-MnMoO 4 [16], Cu 2þ ions in CuMoO 4 -III [17] and Fe 3þ ions in Fe 2 (MoO 4 ) 3 [18]. In all these cases, the superexchange couplings are not the dominant magnetic interactions, but those supersuperexchange couplings with the largest angles.…”

Section: F/afmentioning

confidence: 66%

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Structure and properties of α-AgFe2(MoO4)3

Balsanova

Mikhailova

Senyshyn

et al. 2009

Solid State Sciences

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Silver diiron tris(oxomolybdate), a-AgFe 2 (MoO 4) 3 , was synthesized in sealed silica tubes at 1050 K and is isostructural to a-NaFe 2 (MoO 4) 3 , determined by single-crystal X-ray diffraction (space group PÀ1, a ¼ 6.9320(7) Å, b ¼ 6.9266(6) Å, c ¼ 10.9732(13) Å, a ¼ 81.197(8) , b ¼ 83.456(9) , g ¼ 81.352(8) at 300 K, Z ¼ 2). The crystal structure is built up from both monomers and edge-sharing dimers of [FeO 6 ]octahedra, which are linked with each other by isolated [MoO 4 ]-tetrahedra to a three-dimensional network. Ag ions are situated on a site with four near oxygen neighbours. Thermal expansion is most pronounced along the c-axis, while the angle a decreases with increasing temperature. Antiferromagnetic ordering is indicated by a sharp maximum in the temperature dependence of magnetization at 21.5(5) K, and a magnetic moment of 5.36(1) m B per Fe-ion was derived from the Curie constant in the paramagnetic region. The collinear antiferromagnetic structure with propagation vector k ¼ (0,½,½) and an ordered magnetic moment of 4.62(9) m B per Fe-ion were deduced from neutron powder diffraction data and give evidence for an underlying magnetic interaction mechanism, resulting in rather strong and long-ranged couplings. Mö ssbauer spectroscopy shows a change in the electronic configuration on the two distinct Fe sites between room temperature and 150 K, accompanied by an increase of the average Fe-O distance for one site and a shrinking one for the other as expected for charge ordering in a mixed valence compound with Fe(II) and Fe(III).

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Section: F/afsupporting

confidence: 90%

Section: F/afmentioning

confidence: 66%

Structure and properties of α-AgFe2(MoO4)3

Balsanova

Mikhailova

Senyshyn

et al. 2009

Solid State Sciences

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“…This material also exhibits interesting magnetic properties, i.e. ferromagnetic structure and dominant antiferromagnetic supersuperexchange coupling along the Fe-O-O-Fe paths [9] and the ability to reversibly insert lithium ions, reported for the first time by J. B. Goodenough in the bulk material [10].…”

Section: Introductionmentioning

confidence: 93%

Iron molybdate thin films prepared by sputtering and their electrochemical behavior in Li batteries

Cotte

Pelé

Pecquenard

et al. 2018

Journal of Alloys and Compounds

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International audienceWith the aim of developing 3V all-solid-state lithium microbatteries, Fe2(MoO4)3 thin films were prepared by radiofrequency magnetron sputtering from a home-made Fe2(MoO4)3 target using optimized sputtering conditions. In addition to elemental analyses, Mössbauer spectroscopy and XPS analyses, showing that Mo6+ and Fe3+ are the main detected species, confirmed the stoichiometric character of the films. Post-deposition annealing was necessary to form well-crystallized thin films. The best electrochemical performance was obtained with those annealed at 500 °C which were able to deliver a stable reversible capacity close to the theoretical one, i.e. 2 Li+ per Fe2(MoO4)3 formula unit. The corresponding voltage curve displays a plateau with a low hysteresis located at 3.0 V/Li+/Li and related to the Fe2(MoO4)3 – Li2Fe2(MoO4)3 two-phase system. Therefore, it was demonstrated for the first time the possible use of Fe2(MoO4)3 thin films as positive electrodes for 3 V lithium microbatteries

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“…Therefore, they are called double tungstates and the general formula NaFe x Cr 1Àx (WO 4 ) 2 includes both end-members and their solid solution. This system provides a suitable test for the proposed dominance of supersuperexchange couplings Fe-O-O-Fe, with Fe-O-O and O-O-Fe angles close to 1801 and both bridging oxygens belonging to the same coordination polyhedra of a diamagnetic ion [3]. However, in NaFe x Cr 1Àx (WO 4 ) 2 the layers of magnetic ions parallel to the bc-plane are separated from each other by nearly 10 Å .…”

Section: Introductionmentioning

confidence: 99%