Browsing by Author "Oyama, G"

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    Magnetic structure and properties of the rechargeable battery insertion compound Na2FePO4F
    (American Chemical Society, 2013-12-26) Avdeev, M; Ling, CD; Tan, TT; Li, S; Oyama, G; Yamada, A; Barpanda, P
    The magnetic structure and properties of sodium iron fluorophosphate Na2FePO4F (space group Pbcn), a cathode material for rechargeable batteries, were studied using magnetometry and neutron powder diffraction. The material, which can be described as a quasi-layered structure with zigzag Fe-octahedral chains, develops a long-range antiferromagnetic order below ∼3.4 K. The magnetic structure is rationalized as a super-exchange-driven ferromagnetic ordering of chains running along the a-axis, coupled antiferromagnetically by super-super-exchange via phosphate groups along the c-axis, with ordering along the b-axis likely due to the contribution of dipole–dipole interactions. © 2013 American Chemical Society