Structural study of Nax(M,M’)O2 layered oxides with M=Fe andM’=Mn
The study of the properties of sodium layered oxides started in the 1970s with the discovery of their electrochemical properties for sodium batteries. These systems were also studied for interesting physical properties: a high figure of merit for thermoelectric investigations for the P2-Na~0.7CoO2 phases and a superconductive behavior for the hydrated P2-Na0.35CoO2 phase.In our group, we recently reinvestigated the P2-NaxCoO2 and the P2-Na(Co,Mn)O2 phases as positive electrode in Na-batteries. We also focused on the Nax(Fe,Mn)O2 phases as they could exhibit good cycling properties and the advantage of being non-toxic and inexpensive. We recently synthesized some pure P2 and O3-Nax(Fe,Mn)O2 phases, using the combustion method, varying the Fe/Mn ratio and the Na content. To our knowledge, the P2-NaxMn2/3Fe1/3O2 and the Na-deficient O3 phases were not reported yet. In the opposite, the synthesis and the electrochemical properties of the P2 and O3-NaxFe1/2Mn1/2O2 with x=0.67 and 1 respectively, were very recently reported by Yabuuchi et al., but no detailed structural study was performed. Thus, neutron diffraction would be really helpful to investigate Na/vacancies or Mn/Fe ordering.
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CARLIER Dany; DELMAS Claude; GUIGNARD Marie; MORTEMARD DE BOISSE Benoit and SUARD Emmanuelle. (2013). Structural study of Nax(M,M’)O2 layered oxides with M=Fe andM’=Mn. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1075
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