The influence of intralayer structural distortions on the electrical and magnetic properties of V1+xMo2-xS4 (0 ≤ x ≤ 2)

Anthony V. Powell, Andrew McDowall, Paz Vaqueiro, Ronald I. Smith, Tsukio Ohtani, Yoshihiro Okuya

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The series of compounds V1+xMo2-xS4 (0 = x = 2) has been prepared and characterised by powder X-ray and neutron diffraction, thermogravimetry, SQUID magnetometry and electrical transport measurements. Materials with x = 0.50 adopt a distorted variant of the Cr3S4 structure (space group Cc a ˜ 11.8, b ˜ 6.5, c ˜ 12.8 Å, ß ˜ 114.8°) in which there are triangular clusters of cations within a dichalcogenide unit. At higher levels of vanadium incorporation, the phases crystallise in the space group C2/m (a ˜ 12.8, b ˜ 3.3, c ˜ 5.9 Å, ß ˜ 114.9°) and the cations within the dichalcogenide slab form zigzag chains, with an intrachain cation-cation separation of ca 2.8Å. The change in the nature of the cation clustering occurs at a composition where there is a transition from semiconducting (x = 0.50) to metallic (x > 0.50) behaviour. Magnetic measurements reveal that paramagnetism is observed over the whole composition range. The measured Curie constants suggest a magnetic moment associated with the cations in the ordered defect layer only and indicate a significant degree of electron delocalisation.

Original languageEnglish
Pages (from-to)3051-3057
Number of pages7
JournalJournal of Materials Chemistry
Volume14
Issue number20
DOIs
Publication statusPublished - 21 Oct 2004

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