A Mössbauer study of amorphous iron-phosphorus alloys

The Mössbauer spectrum of amorphous iron-phosphorus has been measured for alloys having compositions ranging from 15 to 25.8 at% phosphorus. Measurements were made at ambient temperature and also above the Curie temperature. The Curie temperature was measured by an induction method and increased linearly from 280 to 300°C with decreasing phosphorus content. The results indicated a large number of different iron sites having the same compositional short-range order as the crystal.     

Study of hyperfine interactions in Fe–Co nanocomposite films by Mössbauer spectroscopy and NMR

Nanogranular magnetic films were produced by the specially designed UHV plasma-jet system with DC hollow-cathode discharge. We investigated the properties of these ferromagnetic FeCo-AlN films. The samples were studied by nuclear magnetic resonance, Mössbauer spectroscopy, and transmission electron microscopy. The films are composed of nanoparticles of cubic FeCo, 2–10 nm in size, embedded in amorphous matrix containing Al, N and O. The Mössbauer spectra indicate that the orientation of local magnetic moments on the surface is random for the sample with 1:1 Fe/Co ratio, while the magnetization lays in the plane of the layer for samples with Fe/Co smaller than 1 (0.91–0.95).     

Formation and mechanical behavior of (Fe0.5Ni0.5)80−xMoxB20 (x = 0–8) amorphous alloys

Glass forming ability, thermal stability and mechanical behavior of (Fe_0.5Ni_0.5)_80?xMo_xB₂₀ (x = 0, 2, 4, 6, 8) amorphous alloys were studied by XRD, TEM, SEM, DSC, tensile test, microhardness test and tearing test. The effects of Mo addition on glass formation, strength and ductility of (Fe_0.5Ni_0.5)_80?xMo_xB₂₀ amorphous alloys were discussed. The substitution of Mo for Fe and Ni simultaneously causes improvement in glass forming ability and thermal stability, and changes the crystallization process. The tensile fracture strength of amorphous alloy depends on both hardness and ductility; the alloy with high hardness and good ductility simultaneously also has a high tensile fracture strength. The (Fe_0.5Ni_0.5)₇₈Mo₂B₂₀ amorphous alloy exhibits good glass forming ability and the highest tensile fracture strength among (Fe_0.5Ni_0.5)_80?xMo_xB₂₀ alloys. Micro-plastic deformation occurred in ductile and brittle amorphous alloys that both show viscous flow characteristics. The mechanical behavior of (Fe_0.5Ni_0.5)_80?xMo_xB₂₀ amorphous alloys is related to the average outer shell electron concentration of metal atoms.     

Magnetic Susceptibility of Deintercalated Tunnel Compound of KxCr5Se8 and Mössbauer Spectra of Kx(Cr0.95 57Fe0.05)5Se8

Abstract

KCr₅Se₈ has a TIV₅S₈-type structure, containing K ions in one-dimensional tunnels. Deintercalated samples of K_xCr₅Se₈ (0.32 ≤ x ≤ 0.93) were prepared by leaching method using Alc₃/FeCl₃ aqueous solution. These samples showed a broad peak of magnetic susceptibility at ca. 130 K. ⁵⁷Fe-Mössbauer spectra of K_x(Cr_0.95 ⁵⁷Fe_0.05)₅Se₈ (x = 1.0, 0.49) showed a quadrupole doublet at 300 K. Magnetic sextets appeared at 4.2 K in both samples, indicative of magnetic ordering. The observed isomer shift indicated that the charge of Fe is +3 in both samples. It was proposed that Se^2- was partially oxidized by the deintercalation.     

Mössbauer study of the amorphous Pd70Fe10Si20 alloy upon transition to the crystalline state

Foils of the amorphous alloy Pd₇₀Fe₁₀Si₂₀ were investigated after isothermal heating at the temperature range 350–450°C with a heating period from 15 min to 4 h. At 350°C no changes were observed in the shape of the Mössbauer spectra. At 400°C and at 450°C up to 30 min only the parameters of Mössbauer spectra consisting of two quadrupole doublets corresponding to palladium and silicon vicinities of iron atoms were changed. After further heating at 450°C crystalline phases of Pd₃Fe and Fe₃Si appeared on the Mössbauer spectra.     

Mössbauer and Magnetic Study of Lanthanum Manganite La1 – xCaxMn0.98Fe0.02O3 + δ (x = 0.05, 0.10, 0.20): Nonstoichiometric and Stoichiometric Composition

Crystallography Reports - Mössbauer and magnetic study of calcium-doped lanthanum manganites La1 – xCaxMn0.98Fe0.02O3 + δ (x = 0.05, 0.10, 0.20)...