fig3

Figure 3. Synthesis process, structural evolution, and physicochemical characterization of FeCoCu alloy foams with different Cu contents. (A) Schematic illustration of the synthesis process; SEM images of (B) the Fe₆₅Co₃₀Cu₅ oxide precursor; and (C) corresponding reduced Fe₆₅Co₃₀Cu₅ alloy; (D) TEM image Fe₆₅Co₃₀Cu₅ alloy and corresponding elemental mappings of Fe, Co, and Cu; (E) XRD patterns of FeCoCu alloys with varying Cu contents; and (F) corresponding enlarged XRD patterns in the 40-50° range; (G) ICP-derived elemental compositions of FeCoCu alloys with varying Cu contents; (H) Mercury intrusion cumulative pore volume curves of Fe₆₅Co₃₀Cu₅ oxide precursor and reduced alloy; and (I) corresponding pore size distributions. (J) Magnetic hysteresis loops of FeCoCu alloys with varying Cu contents. SEM: TEM: XRD: X-ray diffraction; ICP: inductively coupled plasma.