Crystal structure of Rb2Fe5F17

H. H. Park, P. Gravereau, A. Tressaud, P. Hagenmuller

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2 Citations (Scopus)


Fine, whisker-like crystals of Rb2Fe5F17 have been obtained from solid state stoichiometric mixtures of RbF and FeF3. A structural model has been determined from single crystal diffractometer data in the Fmmm orthorhombic space group : a = 14.887(2) A ̊, b = 25.814(3) A ̊, c = 7.560(1) A ̊; z = 8; ρ{variant}exp. = 3.529 g cm-3; ρ{variant}calc.=3.535 g cm-3; λCo Ka=1.7903 A ̊; R = 0.068; Rω = 0.096 for 175 reflections with I σ(I) > 6. The structure has been compared with that of HTB. Rb2Fe5F17 exhibits layers of (Fe5F17)2n-n composition containing FeF6 corned-shared octahedra forming tunnels of hexagonal and triangular sections. Rubidium atoms are located between the layers and within the hexagonal tunnels with statistical occupancy. The structure has been roughly confirmed by TEM. The observed lowering in symmetry from Fmmm may be explained by partial ordering of rubidium and by possible bridging of (Fe5F17) sheets by FeF6 octahedra.

Original languageEnglish
Pages (from-to)321-330
Number of pages10
JournalMaterials Research Bulletin
Issue number3
Publication statusPublished - 1990 Mar

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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