Phase Separation and Phase Transitions in Multiferroic K0.58FeF3 with the Tetragonal Tungsten Bronze Structure

Sandra Ann Reisinger, Marc Leblanc, Anne-Marie Mercier, Chiu C. Tang, Julia E. Parker, Finlay D. Morrison, Philip Lightfoot

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The tetragonal tungsten bronze (TTB) structure multiferroic fluoride K058FeF3 (alternatively K3-xFe5F15 (x approximate to 0.1)) has been studied using variable temperature high-resolution synchrotron powder X-ray diffraction. The as-made sample occurs as a mixture of two closely related TTB phases, one tetragonal (a(TTB) approximate to 12.68 angstrom, C-TTB approximate to 3.98 angstrom) and one orthorhombic (a approximate to 12.70 angstrom, b approximate to 12.66 angstrom, c approximate to 3.98 angstrom). Heating above 340 K produces a single metrically tetragonal phase, but the phase separation reproducibly reappears on cooling. Below 300 K the tetragonal phase undergoes a structural phase transition to a second orthorhombic phase (with a approximate to b approximate to root 2 a(TTB)) and these two different orthorhombic phases continue to coexist down to at least 125 K. These results are discussed in the context of previous studies, which sometimes suggest conflicting structural details within this system.

Original languageEnglish
Pages (from-to)5440-5445
Number of pages6
JournalChemistry of Materials
Volume23
Issue number24
DOIs
Publication statusPublished - 27 Dec 2011

Keywords

  • tetragonal tungsten bronze structure
  • phase transition
  • phase separation
  • multiferroic
  • K3FE5F15
  • 490-K
  • ORDER

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