New metathesis routes to layered dichalcogenides: Synthesis, crystal growth and structure of NayNBX2 (y = 0.5, X = S, Se)

Pamela A. Salyer, Marten G. Barker, Alexander J. Blake, Duncan H. Gregory, David P. Weston, Claire Wilson

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Separated reactant metathesis methods using ternary oxide precursors and yttrium chalcogenides have been used to prepare powders and crystals of alkali metal niobium dichalcogenides, AyNbX2 (X = S, Se). The structure of Na0.5NbSe2 has been solved unambiguously for the first time from single crystal X-ray data (hexagonal space group P63/mmc (no. 194), a = 3.4762(7), c = 15.342(2) Å, U = 160.55(5) Å3, Z = 2). Similarly, the structure of Na0.5NbS2 has also been determined (hexagonal space group P63/mmc, a = 3.3533(4), c = 14.547(3) Å, U = 141.66(4) Å3, Z = 2). Products have been characterised further by powder X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. Magnetic measurements describe temperature-independent paramagnetic behaviour for both dichalcogenides, with no superconducting transitions above 1.8 K.

Original languageEnglish
Pages (from-to)175-180
Number of pages6
JournalJournal of Materials Chemistry
Volume13
Issue number2
DOIs
Publication statusPublished - Feb 1 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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