Low temperature synthesis of LnOF rare-earth oxyfluorides through reaction of the oxides with PTFE

S. E. Dutton, D. Hirai, R. J. Cava

Research output: Contribution to journalArticle

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Abstract

A low temperature solid-state synthesis route, employing polytetrafluoroethylene (PTFE) and the rare-earth oxides, for the formation of the LnOF rare-earth oxyfluorides (Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er), is reported. With the exception of LaOF, which forms in a tetragonal variant, rhomobohedral LnOF is found to be the major product of the reaction. In the case of PrOF, a transition from the rhombohedral to the cubic fluorite phase is observed on heating in air to 500 °C. X-ray diffraction shows the expected lanthanide contraction in the lattice parameters and bond lengths. Magnetic susceptibility measurements show antiferromagnetic-like ordering in TbOF, T m = 10 K, with a metamagnetic transition at a field μ 0H t = 1.8 T at 2 K. An antiferromagnetic transition, T N = 4 K, is observed in GdOF. Paramagnetic behavior is observed above 2 K in PrOF, NdOF, DyOF, HoOF and ErOF. The magnetic susceptibility of EuOF is characteristic of Van Vleck paramagnetism.

Original languageEnglish (US)
Pages (from-to)714-718
Number of pages5
JournalMaterials Research Bulletin
Volume47
Issue number3
DOIs
StatePublished - Mar 1 2012

All Science Journal Classification (ASJC) codes

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

Keywords

  • A. Inorganic compounds
  • B. Chemical synthesis
  • C. X-ray diffraction
  • D. Crystal structure
  • D. Magnetic properties

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