Figure 5: Synthesis of Na4V2(PO4)2F3 and P′2 phase by Na3P ball milling.
From: Insertion compounds and composites made by ball milling for advanced sodium-ion batteries
The XRD Rietveld refinement of (a) Na4V2(PO4)2F3 and the profile matching of (c) P′2-Na1[Fe0.5Mn0.5]O2 phase obtained by ball milling using Na3P as a reducing reagent are shown together with in the middle an electrochemical scale ranking the various used compounds in terms of redox potentials (b). In a,c the orange open circles, black continuous line and bottom grey line represent the observed, calculated, and difference patterns, respectively. Vertical blue tick bars mark the Bragg reflections.
