Synthesis, crystal structure and possible proton conduction of Fe(H2PO4)2F

Zihan Ma, Laura Lander, Shin ichi Nishimura, Chihoko Fukakusa, Teppei Yamada, Masashi Okubo, Atsuo Yamada*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A new iron fluorophosphate compound, Fe(H2PO4)2F, was synthesized by a solvent-less method at low temperatures. Its structure was determined from single crystal X-ray diffraction. Fe(H2PO4)2F was found to have a 3-dimensional structure built up by parallel chains of corner-sharing octahedra. This novel compound crystallizes in a tetragonal I4/mcm space group with the following lattice parameters: a = b = 9.01870(10) Å and c = 7.8058(2) Å. Further characterization of the material was conducted by TGA and Mössbauer spectroscopy. Proton conductivity measurements under dry condition revealed activation energies of Ea = 0.43 eV (along c-axis) and Ea = 0.41 eV (along a-axis) with corresponding room-temperature conductivities 2.6 × 10−7 S cm−1 and 5.8 × 10−8 S cm−1.

Original languageEnglish
Pages (from-to)134-137
Number of pages4
JournalSolid State Ionics
Publication statusPublished - 2019 Oct 1
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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