Properties Of FeNi Research Articles

Configurations, electronic and spin properties of FeN adsorbed HNCO

The configurations, electronic and spin of the FeN–HNCO clusters are calculated at PW91 basis set. The results indicate that a chain structure of H–N–N–Fe–C–O possesses the highest structural and kinetic stability. The FeN–HNCO cluster which possesses an Fe–N–C–N quadrangular ring displays the highest adsorption capacity between FeN and HNCO. The isomer (16) which possesses the chain configuration has higher kinetic activity. The [Formula: see text] orbitals of C and N atoms of the FeN–HNCO clusters gain electrons and the [Formula: see text] orbital of C and N atoms of the FeN–HNCO clusters loss electrons. The chain structure of the isomer (17) has the largest total spin (2.955 [Formula: see text]/atom) than the others.

증착 Power의 세기와 시간에 따른 Fe-N 박막의 구조와 자성 특성

증착 Power의 세기와 시간에 따른 Fe-N 박막의 구조와 자성 특성

Structural, Thermodynamics and Dynamics Properties of Fe-Ni Melts with Different EAM Models

Molecular dynamics (MD) simulation has been performed to explore the microstructure, thermodynamics and dynamics properties of liquid Fe-Ni alloy based upon two different embedded atom method (EAM) models. The calculated PCFs with two EAM models are good agreement with the experimental values. While the calculated Scc (q) of Bhatia-Thornton (B-T) structure factor (SF) shows different behavior: a sharp increasing and a small one at lower q from G. Bonnys model and Zhous model respectively. The mixing of enthalpy with G. Bonnys EAM is positive in the whole concentration range. While the different mixing behavior with a slightly negative mixing of enthalpy based on Zhous model, which is consistent with the experimental results, is observed. Density and diffusion coefficients of liquid Fe-Ni as a function of composition show the same tendency based on both G. Bonnys model and Zhous model. In this work, Fe-Ni melts show different mixing behavior based on the two different EAM models.

Structural, bonding, and magnetic properties of small Fen–xMox (n, x ≤ 6) clusters

The structural, bonding, and magnetic properties of clusters of Fen, Mon, and Fen–xMox (n=2–6, x=1–6) optimized at the B3LYP/LanL2DZ level with symmetry constraints are determined. The effects of the substitution of Mo in Fen on the properties of Fen are identified and discussed. While the cohesion of the Fe cluster is affected only to a small extent by the Mo substitutions, the structure of the cluster changes remarkably. In the mixed Fe–Mo clusters, the Mo–Mo bonds are shorter than the Fe–Fe and Fe–Mo bonds. The smaller distances between adjacent Mo atoms result from the strong d-contribution to bonding. On the other hand, the larger distances between Fe atoms mostly result from the strong magnetic repulsion associated with ferromagnetic coupling. The local moments of the Mo atoms are aligned in antiferromagnetic order. The variations in structural and magnetic properties of Fe clusters due to the Mo distributions are considered to be closely associated with the mechanical and magnetic hardening of Fe–Mo alloys.

Preparation, Characterization and Magnetic Properties of Fe-Ni Alloy/Ni-Ferrite Composite Nanofibers

A series of Fe-Ni alloy/Ni-ferrite composite nanofibers with average diameters of 60~70 nm were successfully fabricated using electrospinning combined with the hydrogen-thermal reduction method. The thermal decomposition behavior of electrospun precursor nanofibers and crystal structures, phase compositions, morphologies and magnetic properties of the resultant products were characterized by means of thermogravimetric and differential thermal analysis, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, and vibrating sample magnetometer. It is found that both the preparation temperature of the pristine Ni-ferrite nanofibers and the reduction tem- perature have considerable influences on the phase compositions and magnetic properties of the corresponding reduction products. With increasing reduction temperature from 270 to 400 ℃ for the Ni-ferrite nanofibers prepared at 550 , ℃ the con- -1 , respectively. Compared to the pristine Ni-ferrite nanofibers, the prepared Fe-Ni alloy/Ni-ferrite composite nanofibers exhibit more excellent soft magnetic properties with much enhanced saturation magnetization due to introduction of Fe-Ni alloy phase. Furthermore, the composite nanofibers composed of three magnetic phases in crystallog- raphy show a good single-phase magnetic behavior, implying that these magnetic phases in composites are well exchange- coupled with each other. The observed changes in magnetic properties for the prepared composite nanofibers can be ex- plained on the basis of the differences in intrinsic magnetic properties between Fe-Ni alloy and Ni-ferrite phases and the changes in grain size, phase composition and magnetic interactions. These novel magnetic composite nanofibers have poten- tial application prospects in flexible magnets, sensing devices, catalysis, microwave absorption and electromagnetic interfer- ence (EMI) shielding. Keywords Ni-ferrite; Fe-Ni alloy; composite nanofibers; magnetic properties; electrospinning; hydrogen-thermal reduction

Formation of the chemical composition of Histosols and histic soils in the forest lands of Estonia

The formation and vertical distribution of the chemical properties of fen (group I, five research areas) and transitional bog (group II, eight research areas) Histosols, and situated depressions of mineral landscape Histic Gleysols (group III, six research areas) and Histic Podzols (group IV, seven research areas) soil covers were studied. As a benchmark in the comparative analysis of Histosols, we used the 20 cm epipedon peat layers of eutrophic moderately acid (I) and mesotrophic very strongly acid (II) types. The thickness of histic soil epipedon peat varied from 10 to 30 cm and was classified as slightly acid peaty mull (IIIa) or strongly acid peaty moder (IIIb), and as very strongly acid peaty mor (IV). In forming the epipedon of the forest floor, aqua regia (mixture of hydrochloridic and nitric acids, 3:1)-extractable Fe, Cr, Al, Pb and Ni accumulated to a great extent (accumulation coefficient>2.5), and S, Na and Hg accumulated to a medium extent (accumulation coefficient 1.2–2.0); the amounts of Zn, K and Mn decreased to a great extent (accumulation coefficient<0.5), and those of Mg and P to a medium extent (accumulation coefficient 0.6–0.8); levels of Ca, Cu and Cd remained practically unchanged. Comparison of Histosol subsoil and substratum peats with a Histosol epipedon demonstrates considerable accumulation of Mn, Pb, Cd, Zn, Hg and Na in the thin (20 cm) superficial peat layer of mires.

Connection between fine atomic crystal structure and martensite gamma-alpha transformations and properties of Fe-Ni thin films

The processes of the fine atomic structure transformations, martensite transformations and properties of the thin Fe-Ni (25-50% Ni) films (0.06-2.0 μm.) were studied by means of x-ray diffraction, nuclear gamma resonance, electron and light microscope The general physical picture of the low temperature (<400°C) atomic- structure transformation of the iron-nickel films containing the high defect density was found. The influence at the martensite transformations and the magnetic and thermal properties of the thickness, grain size and the fine atomic crystal structure of the thin Fe-Ni films were studied The connection between ΔM s and the concentration deviation from average value was found. The new phenomenon, namely low temperature (≤20°C) isothermal reverse α→γ martensitic transformation was discovered The influence of the concentration inhomogenieties and the short-range ordering occurring in the thin Fe-Ni films at the magnetic and thermal properties was studied.

Soft Magnetic Properties of Fe-Ti-N Alloy Thin Films

The dependences of magnetic properties of Fe-N and Fe-Ti-N thin films on nitrogen partial pressure over total sputtering pressure ( PN2 / PTotai ) were studied, and the effect of annealing on Fe-Ti-N thin films was investigated. Thin films were prepared with a dc magnetron reactive sputtering apparatus, using a composite type of target. The coercivity of Fe-Ti-N films was smaller than that of Fe-N films when PN2 / PTotai was more than 1% . The minimum value of the coercivity for Fe-Ti-N films was 2.3 Oe in the easy magnetization direction and 1.25 Oe in the hard magnetization direction when PN2 / PTotai was 2.5%, while it was 4.5 Oe for Fe-N films when PN2 / PTotai was 1%. Annealing at 400°C minimized the coercivity of the Fe-Ti-N film at 1.3 Oe in the easy magnetization direction and 0.9 Oe in the hard magnetization direction.

Domain structures and magnetic properties of FeN films sputter-deposited on sloping surfaces

We obtained soft magnetic properties of FeN on sloping substrates by lamination with thin AlN interlayers. Single layer FeN films on sloping substrate have large saturation field and small squareness. The cause of the degradation of soft magnetic properties in single layer films is ascribed to the perpendicular anisotropy. The existence of the perpendicular anisotropy of FeN sputter-deposited on sloping surfaces is confirmed by the observation of stripe domains with magnetic force microscopy. The observed values of the stripe domain width and the critical film thickness are compared with the calculated values. The stripe domains are parallel to the applied field direction when a saturation field is applied prior to the observation. The stripe domains rotate with the applied field direction.

Crystalline fine structure and properties of Fe-Ni and Fe-Co-Ni electrodeposits obtained at various electrolyte temperatures

An x-ray diffraction study was made of the crystalline fine structure of electrolytically deposited Fe-Ni and Fe-Co-Ni alloys. Studies were made of the magnetic properties, microstructure, microhardness, and the amount of gas evolved from the deposit during aging. Conclusions are reached regarding the relationship of the mechanical and magnetic properties to the structure and chemical properties of the alloys.