Preparation and properties of sodium iron orthooxomolybdates, NaxFey(MoO4)z

Ehrenberg, Helmut; Muessig, E.; Bramnik, Kirill G.; Kampe, Philip; Hansen, Thomas C.

doi:10.1016/j.solidstatesciences.2006.03.001

Cited by 8 publications

(13 citation statements)

References 18 publications

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“…1 Recently, the research interest has been focused on the alluaudite-type of structure. 5,11 Very recently, synthetic sulfates of sodiumiron and sodium-manganese have been found out to crystallize in an alluaudite-type of structure too. 5,11 Very recently, synthetic sulfates of sodiumiron and sodium-manganese have been found out to crystallize in an alluaudite-type of structure too.…”

Section: Introductionmentioning

confidence: 99%

From kröhnkite- to alluaudite-type of structure: novel method of synthesis of sodium manganese sulfates with electrochemical properties in alkali-metal ion batteries

et al. 2015

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The alluaudite-type of structure is of huge research interest as an open matrix ensuring fast alkali-metal ion mobility, a property that could contribute to the development of novel electrode materials for rechargeable alkali-metal ion batteries. In this contribution, we provide new data on the formation of well-crystallized sodium manganese sulfates Na 2+d Mn 2Àd/2 (SO 4 ) 3 with an alluaudite-type of structure by simple dehydratation of the corresponding dihydrate Na 2 Mn(SO 4 ) 3 $2H 2 O with a kröhnkite-type of structure. The structure of Na 2+d Mn 2Àd/2 (SO 4 ) 3 is determined on the basis of Rietveld refinement of powder XRD patterns, infrared (IR) and Raman spectroscopy and electron paramagnetic resonance at X-and Q-band frequencies (EPR). From a structural point of view, the release of two H 2 O molecule from the kröhnkite phase takes place by a transformation of the infinite [Mn(SO 4 ) 2 (H 2 O) 2 ] chains into Mn 2 O 10 dimers bounded by distorted Na(1)O-polyhedra. The anhydrous sulfates are able to participate in the electrochemical reaction delivering a reversible capacity of 135 mA h g À1 , when they are used as cathode materials in lithium ion cells. The stability of the alluaudite phase Na 2+d Mn 2Àd/2 (SO 4 ) 3 in the lithium electrolyte solution and the mechanism of the electrochemical reaction are discussed on the basis of ex situ EPR, IR and Raman spectroscopy. This is a first report on electrochemical activity of manganese-based sulfate with an alluaudite-type of structure.

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Section: Introductionmentioning

confidence: 99%

From kröhnkite- to alluaudite-type of structure: novel method of synthesis of sodium manganese sulfates with electrochemical properties in alkali-metal ion batteries

et al. 2015

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“…The software packages SHELXS [6] and SHELXL [7] were used for structure solution and refinement as included in X-STEP32 [8]. Details of the experimental conditions and the refinement process are summarized in Table 1 for the experiments at 300 (2) and 104(2) K.…”

Section: Single-crystal X-ray Diffractionmentioning

confidence: 99%

“…Crystal structures and properties of quaternary phases in the system Na-Fe-Mo-O have been studied in detail [1][2][3][4]. ]-octahedra was synthesized and characterized [4].…”

Section: Introductionmentioning

confidence: 99%

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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“…More than 60 mercury-containing molecular conductors have been investigated by X-ray study by this time [1][2][3][4]. These are salts with a wide range of electroconducting properties including superconducting as well.…”

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confidence: 99%

“…In the frame of a systematic study of structures and properties of compounds with A = Na or K and T = Fe or Co, we report on the present status of a proposed scheme for known K-Co-orthomolybdates and the corresponding crystal structures: 4 different orthomolybdate structures are known for 3 different compositions, marked as filled circles. K 2 Co 2 (MoO 4 ) 3 exists in two different modifications [1,2]. K 4 Co(MoO 4 ) 3 has been reported in [3], and K 3 Co 2 (MoO 4 ) 3 has an alluaudite-type structure.…”

mentioning

confidence: 99%