Materials Literature
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Titanate nanotubes were synthesized under hydrothermal conditions. The optimized synthesis (100-180 degrees C, longer than 48 h), thermal and hydrothermal stability, ion exchangeability and consequent magnetic and optical properties of the titanate nanotubes were systematically studied in this paper. First, nanotubes…
Using thermodynamic integration, we calculate free energies of the melt and the crystalline phases of a model system of C198H398 with a realistic all-atom potential. We use the Gibbs–Duhem integration scheme to calculate the melting curve over the experimentally relevant pressure range. The crystal structure and the m…
In this work the study of the ferromagnetic resonance (FMR) and of the electrical conductivity in the perovskite sample, Sr2FeMoO6, is presented. The sample has been manufactured by conventional ceramic method sintering in inert gas atmosphere. Electrical conductivity, of about 1000–1200 S/m, has been measured in the…
Al substituted CoAlxFe2−xO4 powders were fabricated using the sol-gel method, and their magnetic and structural properties were studied with thermal analysis, x-ray, neutron diffraction, Mössbauer spectroscopy, and magnetization measurements. The crystals of the samples x=0.1 and 0.2 were found to have a cubic spinel…
Magnetic and magnetoresistive properties of La 0.7- x Pr x Pb 0.3 MnO 3 perovskite polycrystalline have been systematically studied. The substitution of La ions by Pr ions causes the structural change from rhombohedral to orthorhombic and the suppression of ferromagnetism. Ferromagnetic-paramagnetic and metal–insulato…
The influence of tensile stress on hysteresis loops and the magnetomechanical effect in high-magnetostrictive Fe-rich and low-magnetostrictive Co-rich amorphous ribbons were investigated. In the as-quenched Fe-rich alloy a very complex behavior is observed, which indicates the interplay of different types of magnetiza…
The influence of nickel and gallium excess on local structure and magnetic properties of Ni–Mn–Ga alloys has been studied. Nuclear magnetic resonance experiments showed that excessive Ni occupies Mn and Ga positions. This leads to the appearance of low-frequency line from the nearest Mn55 nuclei and generation of frac…
Numerical two-dimensional field investigations in the cross section of laminated nonoriented electrical steel sheet are performed in order to verify the possibilities and limitations of the two needle-probe technique for the measurement of local magnetic flux near the cutting edge. If one of the needles approaches the…
The electronic structure of the delafossite-type compound PdCoO2 is calculated by the full potential linear muffin-tin orbital method and the magnetic property of the composition modified (defect injection introduced) compound Pd0.72Co0.68O2 was investigated. The calculation reveals that the density of states of PdCoO…
In this article, magnetization loops under mechanical stress and magnetostriction loops under quasistatic magnetic excitation conditions are discussed. In both cases, the hysteresis loops are modeled using the Preisach theory. The identification procedure of the material parameters is described. The article discusses…
Crystalline germanium was ablated with light at 532 nm from a frequency-doubled Nd:YAG laser, and the resultant plume reacted with N2 before deposition onto a substrate at 20 K. Multiple absorption lines at 891.8, 890.8, 890.4, 889.9, 889.4, 888.9, 888.4, 887.9, 887.5, and 887.0 cm−1 that become enhanced after anneali…
Nanocrystalline and textured NdFeB magnets were prepared from isotropic melt-spun Nd12Dy2Fe73.2Co6.6Ga0.6B5.6 powder by a modified hot-working process using direct joule heating. The isotropic magnet obtained by current applied (CA) press was composed of randomly oriented Nd2Fe14B grains of 50–100 nm in diameter, and…
Alloys with a Si content of 4.2 and 5.4 wt % Si were produced to investigate the effect of increasing the Si on the materials processing and properties and to understand the effect of the order–disorder phenomenon on its magnetic properties. Different cooling rates after hot rolling were applied: Slow cooling from 780…
We performed hypervelocity impact experiments on SS400 steel with a polycarbonate projectile at velocities up to 9 km/s. Spall fracture damages were observed near a rear surface of the impacted target. The microstructure and microdamages were examined using optical microscopy and scanning electron microscopy. The α−ε…
We have obtained single-phase compounds Gd3Fe29−x−yCoxCry with the Nd3 (Fe,Ti)29-type. Cr is a stabilizing element and also increases the solid-solution limit of Co in the Gd3Fe29−x−yCoxCry compounds. Substitution of Co by Fe results in a significant change of the magnetocrystalline anisotropy and changes the easy mag…
We have succeeded in depositing Sr-ferrite (SrM) thin films with only several nanometer thick with apparent c-axis orientation. Pt underlayer was effective to prepare SrM films with c-axis orientation. Although perpendicular coercivity, Hc⊥, of the Ba-ferrite (BaM) and SrM films prepared by sputtering with Ar decrease…
Some more electric aircraft concepts require soft magnetic FeCo materials to be stable at temperatures as high as 773 K for long periods of time. At this high operating temperature, aging related processes may occur that result in changes in material properties. The material supplier typically specifies only room-temp…
Operating conditions in a current design for a planar geometry oxide fuel cell plant are briefly reviewed and the danger of encountering “metal dusting” conditions identified. Laboratory tests were designed to produce accelerated metal dusting by exposing heat resisting alloys to a CO–26 H2–6 H2O (vol. pct) gas mixtur…
A copper (II) complex ([Cu2(sglym)2(NO3)2]) of tridentate reduced Schiff base ligands, namely, (N-(2-hydroxybenzyl)-glycinamide (Hsglym) was synthesized and characterized in the solid state by single crystal x-ray diffraction techniques. The two Cu(II) atoms are bridged by two phenolate oxygen atoms in the neutral dim…
Exchange interactions between hard-magnetic particles in a nonmagnetic matrix are investigated by model calculations. A Landau–Ginzburg approach is developed to describe the net exchange interactions between spheres of arbitrary diameters. Introducing cylindrical coordinates and integrating over the surfaces of the ad…