Synthesis and Structure of the Ternary Vanadate NaMn4(VO4)3

Yahia, Hamdi Ben; Gaudin, Etienne; Rodewald, Ute Ch.; Pöttgen, Rainer

doi:10.1515/znb-2011-0415

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…3 It crystallizes in the tetragonal space group I4 ˉ2d (Z = 6). Isostructural compounds are Fe 5.33 Ge 2.67 O 12 , 11 Mg 3 (AsO 4 ) 2 , 12 Co 3 (AsO 4 ) 2 , 13,14 ∼LiMg 4 (VO 4 ) 3 , [15][16][17] 19 NaMg 4 (VO 4 ) 3 20 and NaMn 4 (VO 4 ) 3 (first reported by Yahia et al 21 and not by Clemens et al 22 ). 16 / 18 of the Mn 2+ cations are found in octahedral coordination on two different crystallographic sites (8c and 8d).…”

Section: Introductionmentioning

confidence: 92%

“…The manganese cations on the Hoard site (4b) can be aliovalently substituted by charge equivalents of Na + or Li + . In the case of sodium, a full replacement is possible and gives the previously reported compound NaMn 4 (VO 4 ) 3 21,22 (a partial replacement by any degree x in Na x Mn 4.5−x/2 (VO 4 ) 3 is possible as well). For the smaller sized Li + cation replacement is only possible up to a composition of ∼Li 0.66 Mn 4.22 (VO 4 ) 3 .…”

Section: Introductionmentioning

confidence: 94%

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On the soft magnetic properties of the compounds of the series NaxMn4.5−x/2(VO4)3 and the magnetic structure of h.t.-Mn3(VO4)2 (x = 1)

et al. 2013

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The high temperature phase of manganese vanadate h.t.-Mn3(VO4)2 and the solid solution with NaMn4(VO4)3 (Na(x)Mn(4.5-x/2)(VO4)3) were shown to order ferrimagnetically below 55 K for x < 1, whereas NaMn4(VO4)3 is an antiferromagnet. The materials show very soft magnetic properties with low coercitive fields required for demagnetisation (Hc < 0.001 T). The magnetic structure of h.t.-Mn3(VO4)2 was determined by Rietveld analysis of low temperature powder neutron diffraction data, and shows antiferromagnetic alignment of the magnetic moments of the Mn(2+) ions on the 8c and 8d sites. The ferrimagnetic moments were shown to result from the magnetic moments of the Mn(2+) cations located on the 4b site in unusual dodecahedral coordination (Hoard dodecahedron). This coordination can be understood as two penetrating oxygen coordination tetrahedra, one showing shorter and one showing longer Mn-O distances. The magnetic moments of the Mn(2+) ions on the 4b site are aligned parallel to the ones on 8d and antiparallel to the ones on 8c, being in good agreement with the GKA rules. The local exchange interactions between the Mn(2+) ions on the 4b to those on the 8c/8d sites are likely to be similar in strength and competitive and therefore probably contribute to the soft magnetic properties.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 94%

On the soft magnetic properties of the compounds of the series NaxMn4.5−x/2(VO4)3 and the magnetic structure of h.t.-Mn3(VO4)2 (x = 1)

et al. 2013

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A Natural Vanadate–Arsenate Isomorphous Series with Jeffbenite-Type Structure: New Fumarolic Minerals Udinaite, NaMg4(VO4)3, and Arsenudinaite, NaMg4(AsO4)3

et al. 2022

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Two new isostructural minerals udinaite and arsenudinaite with the end-member formulae NaMg4(VO4)3 and NaMg4(AsO4)3, respectively, are found in the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. They are associated with one another and anhydrite, diopside, hematite, schäferite, berzeliite, svabite, calciojohillerite, tilasite, reznitskyite, ludwigite, rhabdoborite-group borates, forsterite, magnesioferrite, fluorapatite, pliniusite, and powellite. Both minerals occur as equant tetragonal prismatic–dipyramidal crystals up to 0.15 mm, aggregates up to 1 cm and interrupted crusts up to 2 × 2 cm2. Udinaite and arsenudinaite, visually indistinguishable from one another, are transparent, beige or brownish-yellowish, with vitreous lustre. Both minerals are optically uniaxial (–); ω = 1.785/1.777 and ε = 1.830/1.820, Dcalc. = 3.613/3.816 g·cm−3 (udinaite/arsenudinaite). The empirical formulae are: udinaite: (Na0.55Ca0.16)Σ0.71(Mg4.04Mn0.02Fe0.01)Σ4.07(V1.63As1.05P0.28Si0.03S0.01)Σ3.00O12; arsenudinaite: (Na0.57Ca0.13)Σ0.70(Mg4.01Mn0.01Fe0.01)Σ4.03(As2.07V0.84P0.10Si0.01S0.01)Σ3.03O12. Both minerals are tetragonal, I-42d, Z = 4, a = 6.8011(2)/6.8022(1), c = 19.1839(12)/19.1843(6) Å, and V = 887.35(7)/887.66(4) Å3, R1 = 0.0287/0.0119 (udinaite/arsenudinaite). Their crystal structure consists of the helical chains of edge-sharing MgO6 octahedra and isolated TO4 tetrahedra, forming a heteropolyhedral pseudo-framework with Na cations located in cavities. Both minerals are isostructural to jeffbenite. Udinaite and arsenudinaite form an isomorphous series in which the contents of T constituents vary within (in apfu): V1.6–0.1As2.8–1.0P0.4–0.0.

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Synthesis and Structure of the Ternary Vanadate NaMn₄(VO₄)₃

Cited by 2 publications

References 15 publications

On the soft magnetic properties of the compounds of the series NaxMn4.5−x/2(VO4)3 and the magnetic structure of h.t.-Mn3(VO4)2 (x = 1)

On the soft magnetic properties of the compounds of the series NaxMn4.5−x/2(VO4)3 and the magnetic structure of h.t.-Mn3(VO4)2 (x = 1)

A Natural Vanadate–Arsenate Isomorphous Series with Jeffbenite-Type Structure: New Fumarolic Minerals Udinaite, NaMg4(VO4)3, and Arsenudinaite, NaMg4(AsO4)3

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