Materials Literature
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Abstract A study of the effect of crosslinking agents on the structure and properties of the millable polyurethane (PU) elastomer is reported here. Effects of the conventionally used dicumyl peroxide (DCP) and tolylene disocyanate dimer (TDID) on the curing characteristics, mechanical properties, and relative thermal…
One can view our comprehension of surface-enhanced Raman scattering, particularly that by colloidal dispersions of metal sols, as the merging of two traditions in light-scattering theory and practice. One of these originated with Michael Faraday's work on brilliantly colored metal sols, which was taken up by Richard Z…
Abstract The effects of different types of elastomeric matrix (NR, SBR, CR, NBR) and several levels (10, 15, and 20 parts phr) of short fibers on mechanical properties of uncured and cured composites and on swelling behavior of composites in hydrocarbon solvent are studied. The variation of the dynamic properties, E ′…
Recent theories of grain boundary structure have been reviewed briefly. The possibility of existence of the same variety of phase transitions on grain boundaries as that on the crystal external surface has been demonstrated. Recent experimental data and theoretical models concerning grain boundary phase transitions ar…
The lifetime of luminescence in CaF 2 :Eu 2+ crystals has been investigated in a temperature range 15-320 K using a streak camera. Unlike the cases of other Eu 2+ -doped crystals, an emission band with a peak at 425 nm was observed to have a lifetime which decreases with decreasing temperature. Such an unusual tempera…
A new model for the explanation of the universal dielectric response law is proposed. It differs significantly from all previous work on the subject. The presented model is based on the assumption that individual dipoles and their environment do not remain independent during the process of relaxation. Therefore the ti…
Investigations of exciton luminescence and absorption spectra of InSe (GaSe) lamellar semiconductors doped with different kinds of compounds at T = 1.8 K are carried out. It is found that changes in the luminescence intensity of free and bound excitons are due to screening of Coulomb interaction between electron and h…
The microstructure of SmFeTi magnets has been investigated by electron microscopy and microanalysis. Melt-spun SmFe10Ti consist of two phases; the hard magnetic SmFe11Ti phase (1:12), with the ThMn12 structure, and α-Fe. The origin of the Fe formation and its influence on the magnetic behavior are discussed. The measu…
Angle-resolved inverse photoemission spectra have been measured at room temperature on the layered transition metal dichalcogenides, 1T-VSe 2 , 1T-TiS 2 , 1T-TaS 2 , 2H-NbSe 2 and 2H-TaSe 2 , in the isochromat mode with a detection photon energy of 9.4 eV. Their energy dispersion curves are obtained along symmetry dir…
The 51 V Knight shift and the quadrupole interaction in a triangular lattice compound LiVO 2 have been studied by means of the pulsed-NMR technique below the transition temperature T t of about 450 K. From the analysis of the NMR spectrum, we determined the principal values of the electric field gradient (EFG) tensor…
Magnetization curves and hysteresis loops for field-oriented powders of Smn+1Co3n+5B2n (n=0, 1, and 3) and PrCo5 were measured at T=4.2 K and partly at 77 K, under a strong pulsed field up to 36 T. Magnetic measurements for Smn+1Co3n+1B2n (n=1, 2, and 3) compounds were also performed. Huge anisotropy fields of 120 T f…
A theory of Raman scattering in quasi-two-dimensional crystals is presented, emphasizing resonance enhancement at the excitonic transition appropriate to the ${\mathit{M}}_{0}$ and ${\mathit{M}}_{1}$ edges. The effect of electron-hole Coulomb interaction leads to metamorphism of the critical points. Our experimental r…
Using a simulation experiment, transient optical 30-Hz elements which respond to dc signal changes in thin-film transistor liquid-crystal display are investigated. After dc voltage is applied, even without dc voltage, the 30-Hz element appears and decays to the level in the steady state. This is explained by the gener…
Considerable improvement of the magnetic properties has been achieved by nitrogen absorption in the RFe10Mo2 compounds with ThMn12-type structure. A lattice expansion has been observed (a=8.6781, c=4.8531 Å for the nitride and a=8.5869, c=4.8002 Å for the nitrogen-free sample) from N2 absorption and a determination of…
Films of binary SmFe12 and Sm(Fe1−xTx)12 compounds, where x≤0.12, and T=V, V-Ti, and Ti, exhibiting the ThMn12-type tetragonal crystal structure have been successfully synthesized. These films were crystallized by rf sputter deposition onto Al2O3 substrates preheated to 400–550 °C. The lattice parameters of the SmFe12…
Magnetic properties are reported for nitrides of the formula (Sm1−xRx)2Fe17Ny, where R=Y, Tb, or mischmetal and y=2.5 to 2.8. Substantial replacement of Sm by R is observed for Sm2Fe17−60% by mischmetal and 100% by Y or Tb. In all cases nitrogenation expands the lattice and increases Tc by 300 to 400 K. Magnetization…
The microstructure of Fe-Nd-B based magnets consists of mainly Fe14Nd2B (Φ) grains embedded in a eutectic matrix of mainly Nd plus some Fe4Nd1.1B4 (η) and Fe-Nd phases stabilized by impurities. The addition of Al or Ga to Fe-Nd-B material leads to the formation of quite different ternary intergranular phases based on…
NdFeB is an important class of new magnetic materials, however corrosion resistance is a serious concern and literature on the electrochemical behavior of NdFeB is scarce. This paper reports the results of an electrochemical investigation of the corrosion behavior of sintered NdFeB magnets obtained from three manufact…
Amorphous wires are prepared by the in-water quenching technique. This procedure gives rise to local magnetoelastic anisotropies arising from the coupling between frozen-in internal stresses and magnetostriction. Azimuthal and axial components of internal stresses have been experimentally confirmed by the asymmetry of…
Formation and desorption of aluminum hydride from hydrogen covered Al(110), Al(100), and Al(111) has been investigated, using thermal desorption spectroscopy. Both desorption of aluminum hydride and molecular hydrogen has been detected with branching ratios depending on surface structure. Production of aluminum hydrid…