<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0202.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mi>Na</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:msub><mml:mo stretchy="false">[</mml:mo><mml:msub><mml:mrow><mml:mi>Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">S</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub><mml:mo stretchy="false">]</mml:mo></mml:mrow></mml

Stüble, Pirmin; Peschke, Simon; Johrendt, Dirk; Röhr, Caroline

doi:10.1016/j.jssc.2017.10.033

Cited by 25 publications

(29 citation statements)

References 85 publications

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“…These dimers, as well as all sulfido and selenido diferrates(III), [13][14][15][16] show an antiferromagnetic (AFM) spin coupling, whereas the recently obtained mixed-valent phase Na 7 Fe 2 S 6 exhibits a very uncommon ferromagnetic (FM) spin coupling. [17] As model systems of such mixed-valent metallates, where the amount of M II and M III can easily be adjusted, we recently obtained (among other mixed Mn/In metallates [18] ) a salt containing the heterobimetallic dimer [Mn II In III S 6 ] 5-. [19] In the course of this work, we realized that there is still considerable lack in the knowledge of the A-rich alkali S/Se/ Te indates, whereas the analogous (mainly di-) aluminates and gallates have been extensively investigated by Hofmann and Eisenmann.…”

Section: Introductionmentioning

confidence: 99%

K₆In₂Q₆ (Q = S, Se, Te): Missing Links in the Series of Alkali Chalcogenido Ditrielates(III)

Langenmaier

Wissinger

Röhr

2019

Zeitschrift anorg allge chemie

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The chalcogenido indates K6In2Q6 (Q = S, Se, Te) were synthesized from melts of the pure elements at a maximum temperature of 700 °C. All three potassium salts contain dinuclear units [In2Q6]6– of two edge‐sharing [InQ4] tetrahedra. The sulfido and the selenido indate are isotypic and crystallize in the K6Mn2O6‐type structure [monoclinic, space group P21/c, a = 784.32(9)/809.32(3), b = 1274.58(14)/1322.37(4), c = 836.48(9)/870.53(3) pm, β = 97.900(2)/97.5877(8)°, Z = 2, R1 = 0.0123/0.0109; for Q = S/Se]. The tellurido indate K6In2Te6 crystallizes in a new orthorhombic structure type [space group Pnma, a = 1793.70(12), b = 1491.55(11), c = 837.40(6) pm, Z = 4, R1 = 0.0157]. In this structure, the telluride anions form a hexagonal close packing, in which K+ cations occupy all octahedral voids; the In3+ ions take 1/6 (but always adjacent) tetrahedral voids. This structure‐chemical relation to the h.c.p. packing, which is similarly found for most of the sodium dimetallates (e.g. Na6Fe2S6), is substantiated by a full crystallographic group‐subgroup tree. The crystal chemistry of the new indates is discussed and compared with that of alkali chalcogenido metallates(III) of Fe, Al and Ga containing [M2Q6]6– dimers, which overall form as many as ten different structure types. DFT band structure calculations of the three title compounds exhibit bandgaps, which continuously decrease from the S to the Te compound and which are also in accordance with the pale yellow (S), bright yellow (Se) and red‐brown (Te) color of the compounds. The chemical bonding in the salts and within the metallate anion is discussed on the basis of the partial DOS and a Bader analysis of the calculated electron density.

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Section: Introductionmentioning

confidence: 99%

K₆In₂Q₆ (Q = S, Se, Te): Missing Links in the Series of Alkali Chalcogenido Ditrielates(III)

Langenmaier

Wissinger

Röhr

2019

Zeitschrift anorg allge chemie

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“…to the (at that time unknown) Na-stuffed ferrate(II) Na 2 [FeS 2 ] (5). [13,14] These structure relations also explain the possibility of continuous Fe redox/sodium exchange reactions, which have been (7) type herein. [24,12] Due to their similar chemistry, lattice parameters and identical Wyckoff sequences, the two structure types are sometimes (e.g.…”

Section: Articlementioning

confidence: 66%

“…[5,39] Its orthorhombic structure of space group I222 was deduced from fibre diffraction patterns by Boller and Blaha as early as 1983, [5] [13,14] ). The authors already noticed the similarity to the Ibam structure of the K 2 [ZnO 2 ]-type, i.e.…”

Section: Articlementioning

confidence: 99%

“…[1][2][3][4] The compounds with a Q:Fe ratio of 2:1 belong to two different classes: The large series of Fe III and Fe II/III mixed-valent chain ferrates exhibit hexagonal rod packings of linear or slightly buckled infinite chains of edge-sharing tetrahedra 1 ϱ [FeQ 4/2 ] n-. [5][6][7][8][9][10][11][12][4][5][6][7][8][9][10][11][12][13][14] The second class are salts containing cubane-type clusters . For numbers referring the structure type cf.…”

Section: Introductionmentioning

confidence: 99%

“…The recently prepared first chain ferrates(II), Na 2 [FeS 2 ] and Na 2 [FeSe 2 ] [13,14] (x = 1, compound 5 in Figure 1), round out the series. The latter Na salts crystallize in the K 2 [ZnO 2 ]-type structure and also contain linear tetrahedra chains.…”

Section: Introductionmentioning

confidence: 99%

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Cs[FeSe₂], Cs₃[FeSe₂]₂, and Cs₇[Fe₄Se₈]: Missing Links of Known Chalcogenido Ferrate Series

Stüble

Röhr

2017

Zeitschrift anorg allge chemie

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High‐Performance Flexible Freestanding Anode with Hierarchical 3D Carbon‐Networks/Fe₇S₈/Graphene for Applicable Sodium‐Ion Batteries

et al. 2019

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Sodium‐ion batteries (SIBs) have gained tremendous interest for grid scale energy storage system and power energy batteries. However, the current researches of anode for SIBs still face the critical issues of low areal capacity, limited cycle life, and low initial coulombic efficiency for practical application perspective. To solve this issue, a kind of hierarchical 3D carbon‐networks/Fe7S8/graphene (CFG) is designed and synthesized as freestanding anode, which is constructed with Fe7S8 microparticles well‐welded on 3D‐crosslinked carbon‐networks and embedded in highly conductive graphene film, via a facile and scalable synthetic method. The as‐prepared freestanding electrode CFG represents high areal capacity (2.12 mAh cm−2 at 0.25 mA cm−2) and excellent cycle stability of 5000 cycles (0.0095% capacity decay per cycle). The assembled all‐flexible sodium‐ion battery delivers remarkable performance (high areal capacity of 1.42 mAh cm−2 at 0.3 mA cm−2 and superior energy density of 144 Wh kg−1), which are very close to the requirement of practical application. This work not only enlightens the material design and electrode engineering, but also provides a new kind of freestanding high energy density anode with great potential application prospective for SIBs.

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Na7[Fe2S6]

Cited by 25 publications

References 85 publications

K₆In₂Q₆ (Q = S, Se, Te): Missing Links in the Series of Alkali Chalcogenido Ditrielates(III)

K₆In₂Q₆ (Q = S, Se, Te): Missing Links in the Series of Alkali Chalcogenido Ditrielates(III)

Cs[FeSe₂], Cs₃[FeSe₂]₂, and Cs₇[Fe₄Se₈]: Missing Links of Known Chalcogenido Ferrate Series

High‐Performance Flexible Freestanding Anode with Hierarchical 3D Carbon‐Networks/Fe₇S₈/Graphene for Applicable Sodium‐Ion Batteries

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Na7[Fe2S6]

Cited by 25 publications

References 85 publications

K6In2Q6 (Q = S, Se, Te): Missing Links in the Series of Alkali Chalcogenido Ditrielates(III)

K6In2Q6 (Q = S, Se, Te): Missing Links in the Series of Alkali Chalcogenido Ditrielates(III)

Cs[FeSe2], Cs3[FeSe2]2, and Cs7[Fe4Se8]: Missing Links of Known Chalcogenido Ferrate Series

High‐Performance Flexible Freestanding Anode with Hierarchical 3D Carbon‐Networks/Fe7S8/Graphene for Applicable Sodium‐Ion Batteries

Contact Info

Product

Resources

About

K₆In₂Q₆ (Q = S, Se, Te): Missing Links in the Series of Alkali Chalcogenido Ditrielates(III)

K₆In₂Q₆ (Q = S, Se, Te): Missing Links in the Series of Alkali Chalcogenido Ditrielates(III)

Cs[FeSe₂], Cs₃[FeSe₂]₂, and Cs₇[Fe₄Se₈]: Missing Links of Known Chalcogenido Ferrate Series

High‐Performance Flexible Freestanding Anode with Hierarchical 3D Carbon‐Networks/Fe₇S₈/Graphene for Applicable Sodium‐Ion Batteries