Materials Literature
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The magnetoresistance of single-crystal graphite has been measured at low temperatures in pulsed high magnetic fields up to 52 T applied parallel to the c axis. Many features were found in the high-field phase after the field-induced electronic phase transition. After the sharp rise at the phase transition, the resist…
We present a model of the electronic density of states (DOS) for a wide class of ternary and quaternary semiconductor alloys. Our approach is based on a large-cluster calculation using a semiempirical tight-binding model for the electronic structure. The microscopic lattice configuration is efficiently determined by a…
Cristallisation dans P2 1 /c avec a = 6,292, b = 12,329 et c = 9,233 A, β = 105,91 °, Z = 2; affinement jusqu'a R = 0,030. La structure consiste en cations et en anions maintenus ensemble par des liaisons hydrogene impliquant tous les atomes H excepte un H appartenant au groupe ammonium. Coordination octaedrique pour…
Abstract Tannin beads formed by reaction of Mimosa tannin (condensed‐type tannin) with formaldehyde in nonpolar polybutenous medium were microspherical resins. Resins prepared with 37.5% tannin concentration were porous spherical resins with 139.22 m 2 /g of surface area (adsorption method of iodine in n ‐hexane, 2.1…
The absorption spectra due to the 4 f →5 d transitions in Ce 3+ centres have been measured with the use of YAG:Ce 3+ single crystals with a lattice concentration [Ce 3+ ] L =(1.28±0.05)%. The data are almost independent of the spectral behaviour of a reference spectrum whose absorption constants are ∼2 cm -1 at the hi…
Photoemission data in which the signal from the first atomic layer is well resolved from that of the bulk are used to determine accurately the kinetic-energy dependence of the inelastic-electron mean free path in the alkali metals. At the higher kinetic energies, the data are in very good agreement with the theory of…
We present photoluminescence and transmission measurements of vapor-grown GaTe crystals. The ground-state 1S triplet and singlet excitonic peaks are well resolved in the optical photoluminescence spectra from high-quality crystals, the triplet state lying \ensuremath{\sim}1.6 meV lower in energy than the singlet state…
The two-particle correlation function is related to the structure factor by an integral transform and serves as an important connection between suspension microstructure, scattering experiments, and macroscopic properties. The nonequilibrium structure factor for a shearing colloidal suspension of spherical particles i…
Recently, Schweizer, Honnell, and Curro reported a self-consistent formulation of the polymer reference interaction site model (PRISM) theory for polymer melts. The purpose of this paper is to compare the predictions of this theory to Monte Carlo simulations of hard chains thereby allowing an independent test of the v…
We have characterized cDNA clones that encode a newly discovered collagenous polypeptide. A 4-kilobase (kb) cDNA clone was initially isolated by screening a human fibroblast cDNA library with a probe encoding the collagenous domain of the human alpha 3(VI) collagen. Subsequent screening of another fibroblast cDNA libr…
X-ray and neutron diffraction measurements were performed on glassy water prepared by rapid cooling of water droplets on a cryoplate. Structure factors and radial distribution functions were found to be nearly identical to those obtained from amorphous ice formed either by vapor deposition onto substrates cooled at 77…
The vibrational properties of Si-Ge systems are studied theoretically with ab initio techniques. Full dispersion relations for pure silicon and germanium crystals under several (homogeneous and epitaxial) strain conditions are obtained from interatomic force constants (IFC's). High-symmetry vibrations for a few short-…
We report visible light emission from diodes made from poly(3-octylthiophene). Use of a soluble derivative of polythiophene allows fabrication of the light emitting diodes by casting the polymer film from solution with no subsequent processing or heat treatment required. The devices emit dim red-orange light with rela…
Electronic structures and band offsets of Zinc-compound (001) strained superlattices are calculated by the first-principles pseudopotential method. It is shown that strained superlattices become quantum well systems of good quality for the states around the fundamental gap. With varying the strain surroundings, band o…
Shock- and release-wave measurements are reported for 6061-T6 aluminum [J. R. Asay and L. C. Chhabildas, in Shock Waves and High-Strain-Rate Phenomena in Metals, edited by M. A. Meyers and L. E. Murr (Plenum, New York, 1981), pp. 417–431], oxygen-free-electronic copper, and a Si-bronze alloy. Significant departure fro…
Plasmons in Si clusters were investigated by electron energy loss spectroscopy attached to high-resolution transmission electron microscopy, by which an individual cluster can be investigated with the electron probe of 2 nm size. It has been found that the plasmon energy increases in proportion to the inverse square o…
The effects of Ti substitution for Fe on octahedral sites in magnetite has been investigated through electrical resistivity measurements. In a manner analogous to zinc ferrites, the Verwey transition temperature is depressed with increasing Ti content. The Verwey transition is of first order in ${\mathrm{Fe}}_{3\mathr…
A diffusion equation describing phase separation during co-deposition of a binary alloy is derived, and solved in the limit of dominant surface diffusion. Linear stability analysis yields results similar to bulk spinodal decomposition, except that long, and possibly all, wavelength are stabilized. Decomposition into t…
We have carried out optical and transport measurements of the free carriers and optical measurements of states above the semiconducting energy gap in the layered crystal ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$. We find that cooling causes a substantial amount of spectral weight to condense from the above-gap states int…
Electric-field-gradient (EFG) calculations for ${\mathrm{TiO}}_{2}$ in the rutile structure using the standard full-potential linearized-augmented-plane-wave (LAPW) method have shown that the contribution of the Ti 3p semicore states is comparable to that of the valence electrons in contrast to other systems studied s…