NaFe3(HPO3)2((H,F)PO2OH)6 : a potential cathode material and a novel ferrimagnet
Abstract
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.
Citation
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 . https://doi.org/10.1021/acs.inorgchem.5b02922
Publication
Inorganic Chemistry
Status
Peer reviewed
ISSN
0020-1669Type
Journal article
Description
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).Collections
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