Structural distortions of the metal dichalcogenide units in AMo2S4 (A = V, Cr, Fe, Co) and magnetic and electrical properties

Paz Vaqueiro, M. Laura Kosidowski, Anthony V. Powell

Research output: Contribution to journalArticle

Abstract

Powder neutron diffraction data collected for AMo2S4 (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, ß ˜ 114°). The structure consists of dichalcogenide (MS2) layers of edge-sharing octahedra, separated by a layer in which 50% of cation sites are occupied in an ordered fashion. Cations in the MS2 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 FeMo2S4 and CoMo2S4 order antiferromagnetically with TN = 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)µBµ(Co) = 2.14(3)µB) are confined to the A cations in the vacancy layer.

Original languageEnglish
Pages (from-to)1201-1209
Number of pages9
JournalChemistry of Materials
Volume14
Issue number3
DOIs
Publication statusPublished - 2002

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Cations
Magnetic properties
Electric properties
Metals
Neutron powder diffraction
Diamond
Magnetic structure
Magnetic moments
Vacancies
Temperature

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Vaqueiro, Paz ; Kosidowski, M. Laura ; Powell, Anthony V. / Structural distortions of the metal dichalcogenide units in AMo2S4 (A = V, Cr, Fe, Co) and magnetic and electrical properties. In: Chemistry of Materials. 2002 ; Vol. 14, No. 3. pp. 1201-1209.
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abstract = "Powder neutron diffraction data collected for AMo2S4 (A = V, Cr, Fe, Co) reveal that the materials crystallize in the space group Cc (a ˜ 11.8 {\AA}, b ˜ 6.5 {\AA}, c ˜ 13 {\AA}, {\ss} ˜ 114°). The structure consists of dichalcogenide (MS2) layers of edge-sharing octahedra, separated by a layer in which 50{\%} of cation sites are occupied in an ordered fashion. Cations in the MS2 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 FeMo2S4 and CoMo2S4 order antiferromagnetically with TN = 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)µBµ(Co) = 2.14(3)µB) are confined to the A cations in the vacancy layer.",
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Structural distortions of the metal dichalcogenide units in AMo2S4 (A = V, Cr, Fe, Co) and magnetic and electrical properties. / Vaqueiro, Paz; Kosidowski, M. Laura; Powell, Anthony V.

In: Chemistry of Materials, Vol. 14, No. 3, 2002, p. 1201-1209.

Research output: Contribution to journalArticle

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