Materials Literature
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High-resolution neutron powder diffraction measurements with λ=1.8232 Å and collimation of 6′-20′-6′ on Nd2Fe17Nx with x=0, 2.85, and 2.91 were carried out at room temperature. Structural parameters and magnetic moments were determined by the Rietveld profile-fitting calculation. The magnetic moments of iron atoms inc…
For an investigation of the growth and the structure of thin Ag films on Pd(111), the angular distribution of core-level photoelectrons emitted at high kinetic energy (>500 eV) was measured with a two-dimensional display-type electron spectrometer. At room temperature, Ag grows epitaxially on Pd(111) in the layer-b…
Micromagnetic analysis using a finite-element technique confirms that intergrain magnetostatic and exchange interactions drastically affect the magnetization reversal mechanism in nucleation controlled permanent magnets. The investigation of the nucleation fields of magnetically coupled grains emphasizes the important…
The effect of different spinless solvents on the magnetism of V(TCNE)x⋅y(solvent) (TCNE=tetracyanoethylene) is studied by temperature (T) dependent ac susceptibility above 2.3 K. Though V(TCNE)x⋅y(CH2Cl2) has a critical temperature Tc ∼400 K, for V(TCNE)x⋅y(C4H8O), Tc ∼205 K and the coercive field is reduced, while fo…
We present charge transport studies on recently developed molecular-based magnets V(TCNE)x⋅y(solvent) (TCNE=tetracyanoethylene) which show local magnetic ordering at temperatures, T, as high as 400 K. V(TCNE)x⋅y(solvent) prepared from the solvent CH2Cl2 has σ(300 K)∼10−3 S/cm, and that prepared from the solvent CH3CN…
The dynamic structure factor S(q,\ensuremath{\omega}) of electrons in single-crystal Al metal was measured with 1.4-eV resolution by means of inelastic x-ray-scattering spectroscopy for q parallel to [100] and for q parallel to [110] with 0.37q2.06 a.u. using synchrotron radiation from DORIS storage ring. The overall…
Melt-spun Nd–Fe–B ribbons containing small amounts of Co, Ga, and C were die upset to 60% and 70% reduction in height in an argon atmosphere between 750 and 800 °C. The magnet, which was die upset 70%, has a remanence of 14.2 kG, Hci of 14.8 kOe, and (BH)max of 48 MG Oe. The interior of the magnet consists of well-ali…
Dynamics of amorphous cis-1,4-polybutadiene was studied by incoherent inelastic and quasielastic neutron scattering below 10 meV in a wide temperature range covering the glass transition temperature Tg. The spectra at low temperatures below Tg show a broad excitation peak at about 2–3 meV, which is the so-called low-e…
New isotropic vector Preisach-type models of hysteresis are introduced. These new models contain additional unknown functions. This presents the opportunity to incorporate more experimental data in the identification process than in the case of previously suggested vector Preisach models, thus leading to more accurate…
The magnetic properties of materials containing rare earth ions coupled to the stable organic radicals nitronyl nitroxides are reported. When the rare earth ions are nonmagnetic, like yttrium(III) and europium(III), the materials behave as one-dimensional antiferromagnets, the coupling between the radicals being deter…
Abstract It has been found that three possible mechanisms can contribute to the improvement in fibre/resin adhesion when high‐modulus polyethylene fibres are subjected to oxygen gas plasma treatment. These mechanisms are surface oxidation, cross‐linking and surface etching. In this paper it is attempted to estimate th…
High-resolution photoemission studies of oxidation of the Al(111) surface have been performed. The appearance of a component at lower binding energy than the metallic bulk Al emission in the Al 2p spectrum at oxygen exposures above \ensuremath{\sim}50 langmuir (1 L = ${10}^{\mathrm{\ensuremath{-}}6}$ Torr s) is argued…
Abstract Surface contamination is one of the most insidious factors affecting adhesive bond performance and, hence, reliability of bonded structures. Sources of contamination are widespread and include primary materials, secondary materials, equipment, human operators, adjacent processes and the atmosphere. A successf…
Recent work by Bertotti [IEEE Trans. Magn. MAG-24, 621 (1988)] and others has shown that it is possible to model the micromagnetic Barkhausen discontinuities at the coercive point using a two-parameter stochastic model. However, the present formulation of the model is restricted to limited regions of the hysteresis cu…
57Fe Mössbauer spectroscopic measurements have been made at 296 K on single crystals of MFe12O19 (M=Ba, Sr, Pb) oriented parallel and perpendicular to the c axis, permitting the establishment of the systematics of the static and dynamical aspects of the hyperfine interactions, and their relationship to crystal/chemica…
Theoretical results obtained with first-principles total-energy calculations are reported for potassium adsorption on the graphite (0001) surface. The structural parameters, the chemisorption energies, and the electronic properties of the K-graphite system are studied at two representative coverages, i.e., in the tria…
We studied the finite-size effect on the first-order metal-insulator phase transition and the accompanying tetragonal-to-monoclinic structural transition of ${\mathrm{VO}}_{2}$ films. The ${\mathrm{VO}}_{2}$ films were epitaxially grown by a metal-organic-chemical-vapor-deposition technique on the (101) growth plane o…
In contrast to most ferromagnetic materials, the low-temperature phase of MnBi exhibits an increased coercivity, Hc, with temperature. μ0Hc has a value of 0.2 T at room temperature, and rises dramatically to a maximum value of 1.9 T at 550 K. In the temperature region near its maximum value, Hc is much larger than tha…
The aim of the present work is to attempt to make a number of different glasses, based on tellurite as the principal former, which contain substantial quantities of zinc oxide up to 40 mol % ZnO. To study the longitudinal elastic properties, measurements have been made of the velocity of the longitudinal ultrasonic wa…
Free-standing, stable, single-sized, and highly pure ZnS nanosize particles or quantum dots are synthesized using a chemical route. The dimension of the quantum dots as estimated from x-ray diffraction was about 7 and 15 Å. The optical band gap for these particles was 5.2 and 4.8 eV, respectively, as compared with the…