High-pressure synthesis of LiTiMF6 (M = Mn, Fe, Co, Ni) with trirutile, Na2SiF6, and PbSb2O6 structures

Tohru Sekino, Tadashi Endo, Tsugio Sato, Masahiko Shimada

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10 Citations (Scopus)

Abstract

High- and low-pressure forms of LiTiM2+F6 (M2 = Mn, Fe, Co, and Ni) were prepared by the reaction of LiF, TiF3, and MF2 under conditions of 1.5-7.0 GPa and 700-1200°C. All the low-pressure phases belonged to a trirutile structure. On the other hand, the high-pressure phases crystallized in a Na2SiF6-type structure for M2+ = Mn and a PbSb2O6-type structure for M2+ = Fe, Co, and Ni. According to the Rietveld analysis, it was observed that such structures were basically described as hexagonal close packing of F- ions with cations placed in half of the octahedral sites, but involved a significant difference in cationic proportions at the z = 0 and 1 2 levels. Detailed structure data of high- and low-pressure phases are included in the present paper, and the structural stability of each phase is discussed relative to the synthetic PT conditions.

Original languageEnglish
Pages (from-to)505-512
Number of pages8
JournalJournal of Solid State Chemistry
Volume88
Issue number2
DOIs
Publication statusPublished - 1990 Oct

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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