Increasing Magnetic Hardness of Fe₃Se₄ via Cu Doping

Abstract

The influence of Cu doping on the structural and magnetic properties of the Fe3Se4 ferrimagnet has been investigated by a combination of X-ray diffraction, Raman spectroscopy, X-ray absorption spectroscopy, and magnetic measurements. While the effects of dopants with ionic radii closer to those of the Fe sites in Fe3Se4 had been studied before, Cu is a less conventional dopant, due to its smaller size (at the same ionic charge) and preference for lower coordination numbers. A (Fe1–x Cu x )3Se4 series, where x = 0–0.15, has been prepared by either high-temperature annealing or the solvothermal method. Although only a limited amount of Cu enters the Fe3Se4 structure, the Cu doping causes a substantial increase in the coercivity of the material. Furthermore, the samples prepared by the solvothermal method exhibit much larger coercive fields as compared to those observed for the samples prepared by high-temperature annealing. The effect was traced to the higher lattice strain accumulated in the samples synthesized solvothermally, as evidenced by the broadening of their Raman peaks.

Microwave‐Assisted Synthesis of Cobalt‐Based Selenides as Catalyst Precursors for the Alkaline Water Oxidation

“…It is also likely that these signals were overlapped with a B 1g peak at 196 cm −1 of Fe vibrations, which also include a E g peak at 248 cm −1 . [ 52 ] The slightly different position of the A 1g Se peak for Co 1 Fe 1 Se n as compared to that recorded for CoSe n might be possibly associated with the change in the selenium–metal bond lengths.…”

“…It is also likely that these signals were overlapped with a B 1g peak at 196 cm À1 of Fe vibrations, which also include a E g peak at 248 cm À1 . [52] The slightly different position of the A 1g…”

3d transition metal substituted Fe3Se4: prediction of potential permanent magnet

“…With x = 0.03 replacement, the T C stayed almost same, but the magnetization rose noticeably, and thus, the (BH) max increased by 130%. Moreover, a recent study reported a significantly enhanced H C from 17.7 kOe to 26.2 kOe at x = 0.10 for (Fe 1−x Cu x ) 3 Se 4 samples prepared by the solvothermal method [28]. Previous calculations, on the other hand, were mostly limited to experimental investigations.…”