Preparation and structure of quaternary mixed sulphide Li(Lu,M)S2 (M=U,Ce)

Nobuaki Sato, Hidetoshi Masuda, Takeo Fujino, Kohta Yamada, Makoto Wakeshima

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The Li(Lu,M)S2 (M=U,Ce) compounds were prepared by the reaction of the weighed mixture of Li2CO3, Lu2O3 and UO2 or CeO2 in a CS2+N2 gas mixture at 800°C for 2 h. It was proved that a series of Li(LuyU1-y)S2 compounds showed an NaCl-type structure in a wide range of y values from 0.2 to 0.8, while the ternary sulphides LiLuS2 and Li2US3 crystallized in hexagonal α-NaFeO2-type structure (R3m) and monoclinic structure (C2/m), respectively. The Rietveld refinement showed that the compound was Li1.5Lu0.5U0.5S2.5 with cubic lattice parameter 5.420 A° and that the space group was Fm3m with the final RI value of 0.027. A series of Li(LuyCe1-y)S2 compounds also showed the NaCl structure in a range of y values from 0.4 to 0.8, though LiCeS2 adopts a Th3P4 structure. The final RI value for the compound Li1.17Lu0.5Ce0.5S2.17 with cubic lattice parameter 5.531 Å was 0.052 after the Rietveld refinement.

Original languageEnglish
Pages (from-to)382-385
Number of pages4
JournalJournal of Alloys and Compounds
Publication statusPublished - 1998 Jun 12


  • Rietveld refinement
  • Structure
  • Ternary sulphides

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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