Propriétés magnétiques et electriques en relation avec leur structure, des composés MMo2S4 (M = V, Cr, Fe, Co)

Chevrel, R.; Sergent, M.; Meury, J.L.; Quan, Dang Tran; Colin, Yves

doi:10.1016/0022-4596(74)90033-4

Cited by 34 publications

(6 citation statements)

References 10 publications

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“…The deviation of this value from the spin-only magnetic moment of 5.92 μ B predicted for high-spin Fe 3+ is considerably greater than could be accounted for by an orbital contribution to the 6 A ground state of a hs-d 5 ion. The value is comparable to that expected for high-spin Fe 2+ ions with spin−orbit coupling and is similar to that obtained previously, from data collected over a wider range of temperatures and attributed to high-spin Fe 2+ . The magnetic susceptibility of CoMo 2 S 4 exhibits weak temperature dependence, with a broad minimum at 60 K and does not follow a Curie−Weiss law at any temperature in the range 5 ≤ T /K ≤ 320.…”

Section: Resultssupporting

confidence: 90%

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Structural Distortions of the Metal Dichalcogenide Units in AMo₂S₄ (A = V, Cr, Fe, Co) and Magnetic and Electrical Properties

2002

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Powder neutron diffraction data collected for AMo 2 S 4 (A ) V, Cr, Fe, Co) reveal that the materials crystallize in the space group Cc (a ≈ 11.8 Å, b ≈ 6.5 Å, c ≈ 13 Å, β ≈ 114°). The structure consists of dichalcogenide (MS 2 ) layers of edge-sharing octahedra, separated by a layer in which 50% of cation sites are occupied in an ordered fashion. Cations in the MS 2 unit are distorted from an ideal hexagonal array. For the early transition series cations A ) Cr, V, the distortion involves the formation of triangular clusters of cations, whereas for A ) Fe, Co diamond-shape cation clusters are observed. The semiconducting properties of these materials are discussed in light of these results. Both FeMo 2 S 4 and CoMo 2 S 4 order antiferromagnetically with T N ) 110 and <300 K, respectively. Low-temperature powder neutron diffraction data demonstrate that both materials have a similar magnetic structure and that the ordered magnetic moments (µ(Fe) ) 3.16(3)µ B , µ(Co) ) 2.14(3)µ B ) are confined to the A cations in the vacancy layer.

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Section: Resultssupporting

confidence: 90%

“…After the second firing, samples were cooled at 4 °C/min to 300 °C prior to removal from the furnace. The material CoMo 2 S 4 was prepared with a slight deficiency in sulfur, corresponding to the stoichiometry CoMo 2 S 3.93 , to avoid the formation of MoS 2 , as reported by Chevrel et al…”

Section: Methodsmentioning

confidence: 99%

Structural Distortions of the Metal Dichalcogenide Units in AMo₂S₄ (A = V, Cr, Fe, Co) and Magnetic and Electrical Properties

2002

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“…43, 46 Powell et al and others have carefully explored this solid solution phase to better under- stand a change in the resistivity, whereby a more Vrich material is metallic, while a more Mo-rich phase is semiconducting. 92 This system is characterized as solid solution dominant.…”

Section: Group 5: V Nb and Tamentioning

confidence: 99%

“…[123][124][125] Two ternary phases are known (CoMo 2 S 4 and CoMo 3 S 4 ) but are difficult to form. 41,46 If one ignores the two ternary phases and calculates a ternary phase diagram, the calculated diagram is MoS 2 dominant. We show no diagram because the temperatures at which the ternary phases are stable are not known.…”

Section: Group 9: Co Rh and Irmentioning

confidence: 99%

Transition Metal–MoS2 Reactions: Review and Thermodynamic Predictions

Domask

Gurunathan

Mohney

2015

Journal of Elec Materi

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Molybdenum disulfide is a layered transition-metal dichalcogenide semiconductor that is attracting renewed attention for its potential use in future nanoscale electronics, optoelectronics, catalysis, tribology, and other fields. In all of these cases, the interaction between MoS 2 and various transition metals is very important. In this work we survey the thermodynamics of the metal-Mo-S systems and the anticipated reaction products from transition metals and MoS 2 . We examined over 200 references on the reactions between transitions metals (M) and MoS 2 , compiled thermodynamic data, and used the thermodynamic data to predict M-Mo-S ternary phase diagrams for systems without experimentally determined diagrams. Where possible, experimental literature on the interactions between metals and MoS 2 was used to corroborate our predicted diagrams and stable reaction products. Both the previously reported and newly predicted M-Mo-S phase diagrams fall into three categories. In the first category, the metal is in thermodynamic equilibrium with MoS 2 . In another, there is a driving force for the metal to reduce MoS 2 , with tie lines to sulfides of the contact metal dominating the phase diagram. In a final category, there is a very stable solid solution or ternary phase that dominates the phase diagram. Better understanding of the phase equilibria in the M-Mo-S systems will aid research on the use of MoS 2 in a variety of fields.

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“…Rhombic tetranuclear metal cores also exist in some solid compounds; Cs^b 4 Cln (17), NaMo 2 0 4(18), MMo2S 4(19), and ReS 2(20).These solid state compounds contain discrete M 4 cluster units linked together by intercluster M-M bonds or by bridging atoms depending on the number of cluster valence electrons. For example, CoMo2S 4 (= Co 2 Mo 4 Ss) has 12 cluster valence electrons and the rhombic Mo 4 cluster units are linked together by another Mo-Mo bond.…”

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confidence: 97%

Synthesis and Structure of Raft-Type Molybdenum Chalcogenide Clusters

Saito

Imoto

Toko

et al. 1996

ACS Symposium Series

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Tetranuclear molybdenum cluster complexes [Mo4S6X2(PMe3)6] (X = SH, Cl, Br, I, NCS) and [Mo 4 S 6 (dtc)2(PMe3)4] have been synthesized. They have rhombic metal cores of molybdenum atoms in +3.5 oxidation state with 10 cluster valence electrons. Hexanuclear molybdenum cluster complexes [Mo6E8Cl6(PEt3)6] (E = S, Se) with 14 cluster valence electrons form by reduction of the trinuclear cluster complexes with six cluster valence electrons. An intermediate seven-electron cluster complex [Mo3S4Cl3(dppe)2(PEt3)] has been isolated. The X-ray structures of these cluster complexes are described.Chemistry of molybdenum chalcogenide cluster complexes has made a remarkable progress in the last decade with the discoveries of cluster compounds of various types (7-7). A number of compounds with triangular and cuboidal cluster cores are now known but relatively few cluster compounds with raft-type frameworks have been reported. Hie raft structures are built from triangular cores by fusion of the edges. The simplest one is a tetranuclear rhombus and a pentanuclear trapezoid and a hexanuclear parallelogram are also found. Although there have been several examples of such tetranuclear clusters of other metals, there are still a very limited number of molybdenum chalcogenide clusters. The present article is concerned with synthesis and structural characterization of a few tetranuclear and hexanuclear cluster complexes coordinated by trialkylphosphines. Apart of the results have been published previously (28, 29, 35). Tetranuclear Cluster ComplexesSynthesis. The reaction of (NH4)2Mo3Si3 (8) dissolved in butylamine and a THF 0097-6156/96/0653-0240$15. 00/0

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Propriétés magnétiques et electriques en relation avec leur structure, des composés MMo2S4 (M = V, Cr, Fe, Co)

Cited by 34 publications

References 10 publications

Structural Distortions of the Metal Dichalcogenide Units in AMo₂S₄ (A = V, Cr, Fe, Co) and Magnetic and Electrical Properties

Structural Distortions of the Metal Dichalcogenide Units in AMo₂S₄ (A = V, Cr, Fe, Co) and Magnetic and Electrical Properties

Transition Metal–MoS2 Reactions: Review and Thermodynamic Predictions

Synthesis and Structure of Raft-Type Molybdenum Chalcogenide Clusters

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Propriétés magnétiques et electriques en relation avec leur structure, des composés MMo2S4 (M = V, Cr, Fe, Co)

Cited by 34 publications

References 10 publications

Structural Distortions of the Metal Dichalcogenide Units in AMo2S4 (A = V, Cr, Fe, Co) and Magnetic and Electrical Properties

Structural Distortions of the Metal Dichalcogenide Units in AMo2S4 (A = V, Cr, Fe, Co) and Magnetic and Electrical Properties

Transition Metal–MoS2 Reactions: Review and Thermodynamic Predictions

Synthesis and Structure of Raft-Type Molybdenum Chalcogenide Clusters

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Product

Resources

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Structural Distortions of the Metal Dichalcogenide Units in AMo₂S₄ (A = V, Cr, Fe, Co) and Magnetic and Electrical Properties

Structural Distortions of the Metal Dichalcogenide Units in AMo₂S₄ (A = V, Cr, Fe, Co) and Magnetic and Electrical Properties