Materials Literature
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Abstract We report calculations of electron inelastic mean free paths (IMFPs) for 50–2000 eV electrons in a group of 27 elements (C, Mg, Al, Si, Ti, V, Cr, Fe, Ni, Cu, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Ta, W, Re, Os, Ir, Pt, Au and Bi). This work extends our previous calculations ( Surf. Interface Anal. 11, 57 (1988)) fo…
Measurements of the triple differential cross section for inelastic photon scattering from bound atomic electrons are reported. The experiment was done using 148 keV synchrotron radiation from the DORIS storage ring at DESY, Hamburg. The target was an 80 nm thin Cu foil.
We investigate the phase-matching properties and the performances of lithium triborate (LBO) crystals, angle- and temperature-tuned to achieve type-I phase matching for ps, high-power, tunable optical parametric amplification (OPA). A novel retracing behavior was observed in the tuning curves of the LBO OPA.
We have carried out high-resolution photoemission experiments on two quasi-one-dimensional compounds: ${\mathrm{K}}_{0.3}$${\mathrm{MoO}}_{3}$ and (${\mathrm{TaSe}}_{4}$${)}_{2}$I. In both systems, a metal-insulator transition associated with a lattice distortion is reported. We show that the Fermi-step characteristic…
Thermal annealing studies of the photoluminescence (PL) intensity and Fourier-transform infrared spectroscopy have been performed concurrently on porous Si. A sharp reduction in the PL intensity is observed for annealing temperatures ≳300 °C and this coincides with desorption of hydrogen from the SiH2 surface species.…
membrane surface due to diffusion interaction between single channels regarded as bystable functional elements of the whole system, were investigated. The possibility of control over the spatial structures of a cellular membrane was demonstrated.
Abstract Gelatin was graft copolymerized with poly(glycidyl methacrylate) using potassium peroxydisulfate in aqueous medium. Effect of temperature, time, initiator, monomer, and backbone concentrations were studied. The percent grafting was found to increase initially and then decrease in all the cases except with var…
Abstract The formation of certain low molecular weight by‐products during the esterification reaction between ethylene glycol and dimethyl terephthalate was investigated. The result obtained showed that the presence of incorporated diethylene glycol within the polymer led to the formation of low molecular weight side…
Abstract A new variation in the bismaleimide (BMI) resin family, maleimide‐terminated poly(oxy‐1,4‐phenylene sulfonyl‐1,4‐phenylene) oligomers, has been synthesized. The preparation of oligomers ( n = 1–12) is described in this study. The structure of these oligomers is characterized by FT‐IR and NMR spectroscopy. The…
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…