Materials Literature
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The NiO(100) Fuchs-Kliewer phonon spectrum has been investigated by high-resolution electron-energy-loss spectroscopy (HREELS) at beam energies of 0.8--17 eV and the intensity distribution of the phonons relative to the dielectric properties of the NiO substrate has been considered. Over most of the range, the spectru…
TlS is known as a mixed valence compound containing monovalent and trivalent thallium ions. The structure of the newly found monoclinic TlS has been analyzed using three-dimensional single crystal diffraction data. Space group C2: a =11.018(6), b =11.039(15), c =60.16(7) Å, β=100.69°(4) and Z =128. The structure is ch…
A detailed investigation of the magnetic properties of single crystals of the two-dimensional layered Heisenberg antiferromagnet MnPS3 and pyridine intercalated MnPS3 by static magnetic susceptibility and electron paramagnetic resonance (EPR) is reported. A detailed analysis of the angular and temperature variation of…
A systematic study of the structural and magnetic properties of the RMo1.5Fe10.5Nx series, where R is Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, or Er, has been carried out using x-ray diffraction, magnetic measurements, and the Mössbauer effect. The 1-12 phase with Ce and Pr has been successfully stabilized. PrMo1.5Fe10.5Nx…
Abstract The factors that influence the morphology and the interfacial parameters during dynamic vulcanization of hydrogenated nitrile rubber/nylon blends are examined. The particle size of the dispersed phase ( R̄ ) and the correlation distance (ξ) of a 50 : 50 blend decreased with increasing mixing time at 250°C, at…
The structure of Cu(110)-(2\ifmmode\times\else\texttimes\fi{}3)N has been investigated with x-ray reflectivity measurements of nine independent surface rods. Observed reflectivities ranging over five orders of magnitude were compared with calculations based on structural models. A pseudo-(100) reconstruction consistin…
Zinc (Zn) is doped into GaSe single crystals grown by the Bridgman technique in a wide range from 0.005 to 0.5 at. % to the stoichiometric melt. Radiative recombination mechanisms have been investigated by using photoluminescence (PL) measurements. The PL spectra in Zn-doped samples at 77 K are dominated by three emis…
We use the field-theoretical methods to derive the self-consistent one-loop equations (Hartree approximation) for the location of the critical point in binary mixtures of polymers. The small parameter in the loop expansion is the inverse of the square root of the number of segments (monomers) in a polymer chain 1/√N.…
Neutron-diffraction data and magnetization measurements of compacted nanophase Cr are presented. Two crystalline Cr phases were found, the majority phase having a bcc structure and the minority phase having an A15 structure. The 100 Bragg reflection seen in antiferromagnetically ordered coarse-grained bcc-Cr polycryst…
Time-resolved small-angle neutron scattering (SANS) experiments have been performed on the self-assembling process of a binary mixture of deuterated polybutadiene and protonated polybutadiene at the critical composition. This mixture has an upper critical solution temperature type of phase diagram with the spinodal te…
A universal-parameter tight-binding molecular-dynamics technique that correctly treats interactions in nontetrahedral as well as multicoordinated covalent systems is used to obtain equilibrium geometries for carbon clusters of arbitrary size. For N\ensuremath{\le}10 the ground states are determined to be linear chains…
A full multiple-scattering method is described for the calculation of angle-resolved photoelectron, Auger-electron, and Kikuchi-electron diffraction patterns. The method is particularly useful for the range of electron kinetic energies from about 50 eV to a few thousand eV. Approximations that take advantage of the fi…
Photoinduced absorption is observed for the polydicarbazolyldiacetylene in the microcrystalline state. The absorption spectrum shows well-defined excitonic features, very similar to those observed for the same polymer in the single-crystal form. Photoexcitation at 2.54 eV gives rise to a structured luminescence emissi…
Amorphous diamond films have been synthesized by pulsed excimer- (ArF) -laser ablation of graphite at room temperature. Detailed studies of the energy-dependent complex dielectric function in the energy range up to 40 eV have been carried out by Kramers-Kronig dispersion analysis of transmission electron-energy-loss s…
Electronic-structure total-energy investigations for the metal-ceramic interface system Ag/MgO(001) show that the preferred adsorption site for the overlayer Ag atom is above the O site of the clean MgO(001) surface. The binding energy of the overlayer Ag atom on the MgO(001) surface is 0.3 eV/atom (0.64 J/${\mathrm{m…
Abstract Pressure‐volume‐temperature measurements were performed on five amorphous thermoplastics. From these data, first derivatives of internal energy with respect to volume were calculated. These derivatives were cast into the Lennard‐Jones form and the two defining parameters were evaluated for each polymer. It wa…
Computational predictions, based upon conventional one-dimensional tunneling theory, are presented for charge and energy transport by electron tunneling thermoelectric effect. It is shown that a temperature difference across a tunnel junction connected in an open electrical circuit produces a thermopower S and a heat…
Abstract Soft‐segment molecular weight, soft‐segment crystallization, hard‐segment‐type, and reactive diluent level were examined in urea and urethane acrylates. Increasing soft‐segment molecular weight led to a decreased tensile modulus, increased strength, and increased elongation at break. Soft‐segment crystallizat…
The satellite structures of 3s core-level photoemission spectra of Mn and Fe dihalides and mono-oxides have been studied systematically. We found that exchange splitting between 3s holes and 3d electrons, intrashell electron correlation, and final-state screening (charge-transfer satellite) effects all contribute to t…
Parallel-detection electron energy loss spectroscopy (EELS) combined with scanning transmission electron microscopy (STEM) and a field emission source provides an unprecedented sensitivity for elemental microanalysis. By deflecting the energy loss spectrum across a parallel detector and computing the difference spectr…