[en] It is shown that the tunneling conductance curves of Woolf and Reif for quench-condensed In-Fe alloy films do not agree with values which are calculated from the theory of Shiba and Rusinov, which is supposed to describe magnetic impurities that interact strongly with the conduction electrons. Possible reasons for the discrepancy are presented. It is also suggested that the theory should be modified to take strong electron-phonon coupling into account in relating the pair-breaking parameter to the impurity concentration for Pb-Mn alloy films. This would not affect the good agreement between the observed tunneling curves for Pb-Mn films and the theory, which Chaba and Nagi have found previously

[en] General formulae are given that allow calculation of harmonics produced by some fundamental perturbations of the components of segmented 2D rare earth cobalt multipole magnets. Also given are relevant specific formulae for the most frequently used shapes of components of segmented multipoles. (orig.)

[en] Brittle hydrides of plate-shaped morphology are known to embrittle the host zirconium matrix. The embrittlement effect is a strong function of the aspect ratio of hydride plates and their major dimension, as thinner plates behave akin to cracks resulting in stress-concentration around their edges, especially when tensile load is acting normal to the broad face of the plates. The embrittlement of the host matrix is due to loss in load bearing area as a result of cracking of the hydride plates under load and severe localized deformation of the ligaments joining the hydride plates. In a recent experiment, authors succeeded in creating an extremely high density of nucleation sites for hydrides that were much stronger than those available otherwise in Zr by a synergistic effect of addition of a small quantity of Y to Zr and microstructural modification of the resulting Zr-Y alloy by quenching. These sites, which are essentially nano (< 5nm) Zr-Y-O complexes, lead to precipitation of only sub-microscopic hydrides that do not embrittle the host matrix

[en] Five phases exist in the system Co-Si: Co₃Si, α- and β-Co₂Si, CoSi and CoSi₂. The phases α-Co₂Si and CoSi could be prepared by chemical transport with iodine as transport agent in the temperature range between T₁ (700 C) and T₂ (900 C). In a attempted systematic clarification of the chemical transport reactions of all phases in the system, the effective transport equilibria were determined. Thermodynamic data show satisfactory agreement between calculation and experiment. (orig.)

No abstract available

[en] Zr₂Fe is a phase which appears from the peritectic reaction L + ZrFe₂↔Zr₂Fe at 974 degree C in the Zr - Fe system. This phase decomposes in the eutectoid form Zr₂Fe↔Zr₃Fe + ZrFe₂ ∼ at 775 degree C and exists in the composition range: 31.0 - 33.3 at. % Fe. This intermetallic has a body centre tetragonal (bct) crystalline structure but oxygen, nitrogen or carbon added stabilises a cubic Ti₂Ni - type structure. Previous studies show the presence of this cubic phase in the Zr - Nb - Fe system. In this work the stability range of the intermetallic Zr₂Fe with low contents of Nb and the existence of the mentioned cubic phase were studied. Samples with 33 at. % Fe and 1.5 ≤ Nb ≤ 7 at. % were analysed with X-ray diffraction, optical and electron microscopies and electron microprobe. It was found that the solubility of Nb in the Zr₂Fe compound would be ∼ 0.3 at. % and the (Zr + Nb)₂Fe phase was present with Nb contents ≥ 1.7 at. %. A phase with Zr - 50 % at. Fe - 13 % at. Nb composition was also detected. (author)

[en] Magnetization reversal process has been studied in ferromagnetic amorphous wires of nominal composition Fe_77.5B₁₅Si_7.5 prepared by the cold-drawing technique. Conventional hysteresis loops were measured by the fluxmetric method in the presence of the tensile stress. The measurements have been performed by short movable coils. Application of tensile stress results in increase of the remanent magnetization and decrease of the switching field. When the tensile stress is high enough, the shape of hysteresis loop is perfectly rectangular that is associated with quick enough reversals of magnetization. These hysteresis loops could be considered as quasi-magnetically bistable, but it is not exactly the standard bistability. The experiments with short movable coils have demonstrated that two domain walls (in contrast with the case of the standard bistability) propagation is responsible for the remagnetization process of the inner core

[en] ⁵⁷Fe Moessbauer spectroscopy was used to elucidate the nature of the hyperfine interactions present in amorphous and nanocrystalline forms of Fe₈₀Ti₇Cu₁B₁₂ alloy. Two mutually independent distributions of hyperfine fields and one sextet of Lorentzian lines were employed to reproduce the broad (atoms in amorphous rest and interface zone) and narrow (ordered) parts of the spectra, respectively. The presented conclusions are derived from three-dimensional mapping of the hyperfine field distributions corresponding to both amorphous and interfacial spectral components. The individual distributions are decomposed into Gaussian components which characterize different types of hyperfine interactions. (author). 4 figs., 5 refs

[en] New ternary indides Hf_8.14Co_7.86In₁₄ have been found in the system Hf-Co-In at 870 K. The crystal structure of Hf_8.14Co_7.86In₁₄ has been refined using single-crystal X-ray data: Zr₉Co₇In₁₄ structure type, Fm3m space group, Z=4, a=13.203(2) A, V=2302(1) A³, R=0.0453 for 213 unique reflections hkl (KUMA-Diffraction KM-4 diffractometer, Mo Kα radiation). The coordination polyhedra of the Hf atoms have 12 and 14 vertices, those of the In atoms have 14 and 16 vertices and those of the Co atoms have nine and 14 vertices. The structure can be described as a stacking of columns of cubes, tetragonal antiprisms and cubooctahedrons extending along the coordinate axes, with Frank-Kasper polyhedra and empty tetrahedra between these columns. (orig.)

[en] The (EDAX) energy dispersion analysis by x ray is used to quantitatively predict the corrosion behavior of materials exposed to a variety of severe environment. The EDAX predicts physical and chemical changes at corroding surfaces