Materials Literature
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The effectiveness of Pd-coating on ZrNi against impurity gas exposure was examined. X-ray diffraction profiles revealed that the surfaces of plate and grain samples are readily covered with Pd by electroless plating. Mutual diffusion between the Pd-overlayer and the ZrNi substrate and PdZr formation took place by vacu…
The de Haas-van Alphen (dHvA) effect was measured for the paramagnetic compound CrP with an orthorhombic MnP-type structure using a high quality single crystal. Ten branches of dHvA frequency below 9200T are obtained in the (010) plane at 0.6K. Four frequencies in a field along the symmetry axes agree qualitatively wi…
The curling mechanism has been found to be an appropriate model to describe magnetisation reversal in BaFe/sub 12/O/sub 19/ films with perpendicular anisotropy. Measurements of rotational hysteresis and the angular dependence of coercivity, remanent coercivity and hysteresis loss support this result.
The non-metallic, magnetically-dilute, cation-disordered perovskite La1.5Sr0.5RhMnO6 is shown to be a soft ferromagnet with TC = 105 K with an ordered magnetic moment of 3.56(8) µB per Mn.
The influence of single phason flips on the electronic properties of quasicrystalline model systems is investigated instead of using random tiling models. In a tight binding model of the Penrose lattice there are seven different types of possible phason flips according to the involved vertex stars. Tolerating a random…
Crystalline ultraphosphates are a relatively new group of phosphate-rich compounds. We tried to find out a system of systematic order in crystal-chemical sense. Some selection rules as well as necessary conditions are given. In this way, we like to bring in some light into the building principles of these very interes…
Structural, mechanical and thermodynamical properties of close packed binary systems of discs with hard, elastic and Lennard-Jones potentials of interaction are considered. Using the method of molecular dynamics the transition from crystal melting to glass softening with increasing relative dispersity in disc size fro…
We report a study of the magnetoresistance (MR) of the metallic perovskite oxide LaNiO$_{3-\delta}$ as a function of the oxygen stoichiometry $\delta$ ($\delta \leq$ 0.14), magnetic field (H $\leq 6T$) and temperature (1.5K $\leq $ T $\leq $ 25K). We find a strong dependence of the nature of MR on the oxygen stoichiom…
The position of Cr cations within a mullite lattice has recently been determined by analysis of contrast in two-dimensional incoherent channelling patterns (ICPs), obtained from variations in characteristic X-ray emission rate with electron beam orientation, near low index zone axis orientations. In previous work a th…
By meclianically alloying and successive heat treatment, Fe-Ni Invar alloys around 35 at% Ni have been made with wide variety of concentration fluctuation. Observed magnetization curve changed significantly by annealing. The saturation magnetization decreased first, took a minimum at 500°C annealing and then increased…
Summary A versatile finite-difference program has been developed for solving 3-D magnetotelluric problems in which the inducing field is uniform and horizontal. Finite-difference equations for the magnetic-field components are obtained by integrations over rectangular volume elements surrounding each node of the grid.…
The development and technological aspects of a 2D magnetization and magnetostriction measurement setup are documented and described. Local magnetic intensity and flux density are measured with Rogowski and material encircling coils. In-plane strain is measured with a homodyne laser interferometer. Measured and process…
Composite insulation systems consist of different insulators and their systems are widely used in high voltage equipment and in power cables. These interfaces are the weak part of the composite and play a decisive role in the electrical treeing and dielectric breakdown processes of the composite. Therefore, it is impo…
Larger pores, a compact matrix and smaller fraction of grain boundaries in foams resulted in less effective dissipation of heat transfer and a larger mean free-path for phonons to propagate.
Hot-isostatic-pressed (HIP'd) tetragonal zirconia ceramic containing 3mol% Y2O3 was soaked in hot water at 95-100°C to evaluate the transformation rate from the tetragonal (T) to the monoclinic (M) phase. The transformation rate differed considerably between the polished surface and the surface cut by a diamond wheel.…
Effect of skin-pass rolling direction on magnetic properties and directionality in semiprocessed nonoriented electrical steel sheets produced by skin-pass rolling process was studied. Skin-pass rolling direction affects greatly magnetic properties and directionality. By the control of skin-pass rolling direction, the…
Phospholipase D (E.C. 3.1.4.4) from Streptomyces antibioticus has been crystallized in six crystal forms using the hanging-drop vapour-diffusion method. The type III and V crystals belong to monoclinic and hexagonal systems, respectively. All of the other crystal forms, types I, II, IV and VI, belong to orthorhombic s…
An experimental visual observation and theoretical study were carried out to investigate the dynamic behavior of bubble nucleation and growth in a foam extrusion die. In this study, a mixture of polypropylene and isobutane was extruded through a slit die with glass windows, and gas bubbles in the flow channel were obs…
Using single phased Ce2Fe17 and Lu2Fe17 with the rhombohedral Th2Zn17-type and Th2Ni17-type structure, respectively, we performed measurements of magnetization and resistivity under various magnetic field up to 5.5T. Ce2Fe17 exhibits a simple helical spin structure with a wave vecter of τ= 0.0372 Å-1 parallel to the c…
The determination of ferroresonant oscillations in circuits with voltage transformers is a highly nonlinear problem due to the possible core saturation. It is achieved with an algorithm based upon the harmonic balance method in the frequency domain. Advantages over a time domain description are discussed. Branches of…