FTIR, magnetic and Mössbauer investigations of nano-crystalline Fe_xCo_1−x(0.4 ≤ x ≤ 0.8) alloys synthesized via a superhydride reduction route

Abstract

Observation of strong dipolar interactions leading to improved magnetic properties of chemically synthesized FexCo1−x alloy nano-materials (size range, 24–51 nm).

Transforming a Diamagnetic Ordered Mesoporous Silica Monolith into a Room Temperature Permanent Magnet through Multiscale Control of the Magnetic Properties

“…The a cubic lattice parameter a =2.84±0.02 Å was calculated from the position of the (110), (200), and (211) diffraction lines. This lattice parameter is consistent with the cubic lattice parameter reported in literature for CoFe alloy with the formula Co 0.6 Fe 0.4 ( a =2.852±0.002 Å) . TEM images of MonoRedCoFe are shown in Figure a and Figure S11.…”

“…Reticular planes can be seen over the whole dark area, indicating that the Nps are single nanocrystals. The average measured distance between two lattice planes of 2.02±0.04 Å is consistent with the (110) d‐spacing of a CoFe alloy . Nps have an average size of 4.1 nm and a narrow size distribution (standard deviation of 0.67 nm; the size‐distribution histogram is given in Figure S11).…”

Amorphous FexCo1–x Wire-like Nanostructures Manufactured through Surfactant-Free Magnetic-Field-Induced Synthesis

“…According to Figure j, these diffuse spots are associated with the presence of crystalline Co 3 O 4 . The electron diffraction spectra corresponding to iron wire-like nanomaterial display considerably sharp rings, the positions of which are typical for polycrystalline iron. , In turn, the ED patterns registered for all Fe–Co chains look very similar, and they consist of two highly diffuse rings which are characteristic for nanocrystalline or amorphous materials. ,,, Surprisingly, these diffraction rings can be assigned to the (110) and (211) crystal planes typically present in a body-centered cubic (bcc) structure of the Fe–Co alloy, whereas the ring corresponding to the (200) plane is not recorded. ,− Undoubtedly, this is related to the amorphous nature of the Fe–Co nanomaterials. It is also worth noting that the ED measurements do not exhibit any signal coming from oxides.…”

Oleic acid/oleylamine ligand pair: a versatile combination in the synthesis of colloidal nanoparticles

“…A variation in M s was observed based on varying alloy compositions, reduction in particle size, altered crystal anisotropies and spin canting at the surface of the NPs. 319 Panda and co-workers synthesized bcc Fe 50 Co 50 alloy NPs via the simultaneous chemical reduction of FeCl 3 and CoCl 2 precursors in diphenyl ether using superhydride as the reducing agent and OAc/OAm as capping agents. The magnetic hysteresis studies showed the ferromagnetic behavior of the NPs at room temperature, which was explained by the authors based on the fine particle magnetism, which indicates the effects of surface and size on the magnetization.…”