Preparation of Fe@Fe3O4/ZnFe2O4 Powders and Their Consolidation via Hybrid Cold-Sintering/Spark Plasma-Sintering

Abstract

Our study is focused on optimizing the synthesis conditions for the in situ oxidation of Fe particles to produce Fe@Fe3O4 core–shell powder and preparation via co-precipitation of ZnFe2O4 nanoparticles to produce Fe@Fe3O4/ZnFe2O4 soft magnetic composites (SMC) through a hybrid cold-sintering/spark plasma-sintering technique. XRD and FTIR measurements confirmed the formation of a nanocrystalline oxide layer on the surface of Fe powder and the nanosized nature of ZnFe2O4 nanoparticles. SEM-EDX investigations revealed that the oxidic phase of our composite was distributed on the surface of the Fe particles, forming a quasi-continuous matrix. The DC magnetic characteristics of the composite compact revealed a saturation induction of 0.8 T, coercivity of 590 A/m, and maximum relative permeability of 156. AC magnetic characterization indicated that for frequencies higher than 1 kHz and induction of 0.1 T, interparticle eddy current losses dominated due to ineffective electrical insulation between neighboring particles in the composite compact. Nevertheless, the magnetic characteristics obtained in both DC and AC magnetization regimes were comparable to those reported for cold-sintered Fe-based SMCs.

PVDF/Fe3O4@pDA@Ag Nanofiber Membranes with Multicore–Shell Structure for EMI Shielding

“…The diffraction peak observed in each NFM corresponded to the (110) crystal plane of PVDF, , with a 2θ of 20.9°. The NFMs loaded with Fe 3 O 4 NPs all exhibited a diffraction peak at 2θ = 35.8°, belonging to the (311) crystal plane of Fe 3 O 4 (JCPDS NO.99–0073), indicating successful Fe 3 O 4 doping. , However, the diffraction peaks at 20.9 and 35.8° in the XRD patterns of NFMs with a pDA coating were weak. Compared with the PDF card of Ag (JCPDS NO.04–0783), the XRD pattern of PVDF/Fe 3 O 4 @pDA@Ag showed diffraction peaks at 2θ = 38.2, 44.3, 64.6, and 77.7°, which corresponded to the (111), (200), (220), and (311) crystal planes of Ag, respectively. , Meanwhile, due to the complete coverage of Ag on the fiber surface, the diffraction peaks at 20.9 and 35.8° were very weak.…”