Magnetic ordering and bond geometry in garnets with Fe3+ ions in the tetrahedral sublattice

Plakhtii, V. P.; Golosovskii, I. V.; Bedrisova, M. N.; Smirnov, A. B.; Sokolov, V. I.; Mill, B. V.; Parfenova, N.N.

doi:10.1002/pssa.2210390239

Cited by 10 publications

(3 citation statements)

References 10 publications

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“…Taken as a whole, the 120° antiferromagnetic ground state we have determined is fully consistent with prior studies on garnets with magnetism isolated to the tetrahedral sublattice . Upon removing magnetic cations from the octahedral sublattice, the moments on the tetrahedral sites cant away from the (111) axis of the cubic structure and instead orient antiparallel across the shared edge of the cubic sites, much like what Geller and co-workers proposed and what Dodokin et al observed using Mössbauer spectroscopy .…”

Section: Resultssupporting

confidence: 90%

Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet

et al. 2021

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We present a study on the nuclear and magnetic structures of two iron-based garnets with magnetic cations isolated on tetrahedral sites. Ca2YZr2Fe3O12 and Ca2LaZr2Fe3O12 offer an interesting comparison for examining the effect of increasing cation size within the diamagnetic backbone of the garnet crystal structure, and how such changes affect the magnetic order. Despite both systems exhibiting well-pronounced magnetic transitions at low temperatures, we also find evidence for diffuse magnetic scattering due to a competition between the nearest-neighbor, next nearest-neighbor, and so on, within the tetrahedral sites. This competition results in a complex noncollinear magnetic structure on the tetrahedral sublattice creating a mixture of ferro- and antiferromagnetic interactions above the long-range ordering temperature near 20 K and suggests that the cubic site of the garnet plays a significant role in mediating the superexchange interactions between tetrahedral cations.

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Section: Resultssupporting

confidence: 90%

Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet

et al. 2021

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“…The NSE and SQUID results presented here have given evidence for the existence of paramagnetic fluctuations in halloysite and montmorillonite and confirm the truism that a standard neutron experiment measures total scattering which can be due to the coherent, the incoherent or the magnetic parts of the scattering. Considering that the Q -dependence of magnetic scattering is modulated by f 2 ( Q ), which decreases with increasing Q , and that the diffusion process is characterized by a Lorentzian width of DQ the discrimination from magnetic scattering to water diffusion is complicated. It is therefore clear that, in natural clays containing magnetic ions incorporated in the structure, it will be difficult to assess real time characteristics of water diffusion without polarization analysis.…”

Section: Discussionmentioning

confidence: 99%

Quasi-Elastic Neutron Scattering Studies on Clay Interlayer-Space Highlighting the Effect of the Cation in Confined Water Dynamics

et al. 2008

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It has long been realized that cations play a critical role in the readsorption of water into the interlayer region in clay minerals. To explore possible differences in the water dynamics related to the presence of cations in clays, and to examine the dynamics of its surface water, which plays a prominent role in diffusion of water in clay barriers a comparative study was carried out to highlight differences between water dynamics in montmorillonite and halloysite. Whereas montmorillonite has interlayer cations that interact with interlayer water, and which can rehydrate after dehydration at temperature, halloysite has no interlayer cations. Water is found in both interlayers and on the surface of these clay particles. In this study we show that by combining incoherent inelastic neutron scattering (quasi-elastic and elastic fixed window) and neutron spin echo, it was possible to discriminate the dynamics of surface water (by collapsing the interlayer region by heating and rehydrating the surface layer) from interlayer water. The analysis of the elastic fixed window scans in the temperature range 5−300 K revealed an extension of water dynamics in montmorillonite to lower temperatures than in halloysite. These differences suggested mechanisms that cations (Na+ in this case) in the interlayer regions facilitate water mobility allowing interlayer water to be readmitted to montmorillonite. Finally it was shown that the occurrence of magnetic fluctuations, caused by the presence of paramagnetic Fe3+ ions in the crystalline clay lattice, gave rise to a quasi-elastic contribution that disrupted the evaluation of water diffusion computed from such measurements. Therefore previous estimates of water diffusion coefficients might have been overestimated in recent literature.

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“…The corresponding unit-cell parameter a = 12.5257 (1) A determined from room-temperature powder X-ray measurement data is in very good agreement with the one from singlecrystal data (Table 2). In the context of investigating the magnetic ordering of Fe III on the Z sites, neutron powder data recorded at room temperature were also reported for Na 3 Te 2 (FeO 4 ) 3 (Plakhtii et al, 1977). Table 1 Selected bond lengths (A ˚) in related garnet-type Na 3 Te 2 (ZO 4 ) 3 oxidotellurates(VI) and their structure similarity parameters relative to Na 3 Te 2 (FeO 4 ) 3 .…”

Section: Structural Commentarymentioning

confidence: 99%

Garnet-type Na₃Te₂(FeO₄)₃

Eder

Weil

2023

Acta Cryst E

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Na3Te2(FeO4)3 or Na3Te2Fe3O12, trisodium ditellurium(VI) triiron(III) dodecaoxide, was obtained in the form of single-crystals under hydrothermal conditions. Na3Te2(FeO4)3 adopts the garnet structure type in space group Ia\overline{3}d and comprises one Na (multiplicity 24, Wyckoff letter c, site symmetry 2.22), one Te (16 a, .\overline{3}.), one Fe (24 d, \overline{4}..) and one O atom (96 h, 1) in the asymmetric unit. The three-dimensional framework structure is built of [TeO6] octahedra and [FeO4] tetrahedra by vertex-sharing. The larger Na+ cations are situated in the interstices of the framework and are eightfold coordinated in the form of a distorted dodecahedron. Quantitative structural comparisons with isotypic Na3Te2[(Fe0.5Al0.5)O4]3 and Na3Te2(GaO4)3 show a high degree of similarity between the three crystal structures.

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Magnetic ordering and bond geometry in garnets with Fe3+ ions in the tetrahedral sublattice

Cited by 10 publications

References 10 publications

Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet

Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet

Quasi-Elastic Neutron Scattering Studies on Clay Interlayer-Space Highlighting the Effect of the Cation in Confined Water Dynamics

Garnet-type Na₃Te₂(FeO₄)₃

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Magnetic ordering and bond geometry in garnets with Fe3+ ions in the tetrahedral sublattice

Cited by 10 publications

References 10 publications

Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet

Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet

Quasi-Elastic Neutron Scattering Studies on Clay Interlayer-Space Highlighting the Effect of the Cation in Confined Water Dynamics

Garnet-type Na3Te2(FeO4)3

Contact Info

Product

Resources

About

Garnet-type Na₃Te₂(FeO₄)₃