NaFe3(HPO3)2((H,F)PO2OH)6: a potential cathode material and a novel ferrimagnet

Irene Munao, Elena Zvereva, Olga Volkova, Alexander Vasiliev, Robert Armstrong, Philip Lightfoot

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


A novel iron fluorophosphite, NaFe3(HPO3)2((H,F)PO2OH)6, was synthesized by a dry low-temperature synthesis route. The phase was shown to be electrochemically active for reversible insertion of Na+ ions, with an average discharge voltage of 2.5 V and an experimental capacity at low rates of up to 90 mAhg−1. Simple synthesis, low-cost materials, excellent capacity retention, and efficiency suggest this class of material is competitive with similar oxyanion-based compounds as a cathode material for Na batteries. The characterization of physical properties by means of magnetization, specific heat, and electron spin resonance measurements confirms the presence of two magnetically nonequivalent Fe3+ sites. The compound orders magnetically at TC ≈ 9.4 K into a state with spontaneous magnetization.
Original languageEnglish
Pages (from-to)2558-2564
Number of pages7
JournalInorganic Chemistry
Issue number5
Early online date16 Feb 2016
Publication statusPublished - 7 Mar 2016


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