NaFe3(HPO3)2((H,F)PO2OH)6 : a potential cathode material and a novel ferrimagnet
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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.
Munao , I , Zvereva , E , Volkova , O , Vasiliev , A , Armstrong , R & Lightfoot , P 2016 , ' NaFe 3 (HPO 3 ) 2 ((H,F)PO 2 OH) 6 : a potential cathode material and a novel ferrimagnet ' Inorganic Chemistry , vol 55 , no. 5 , pp. 2558-2564 . DOI: 10.1021/acs.inorgchem.5b02922
Copyright © 2016 American Chemical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1021/acs.inorgchem.5b02922
The authors thank the University of St Andrews and EPSRC (EP/K503162/1) for partial support of a studentship to I.M. The work was supported by the RFBR (grants 14-02-00245, 14-02-00111. The Russian team acknowledge support from the Ministry of Education and Science of the Russian Federation in the framework Increase Competitiveness Program of NUST «MISiS» (№ К4-2015-020 and К2-2015-075) and by Act 211 Government of the Russian Federation, contract(№ 02.A03.21.0006).
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