Materials Literature
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Measurements were made of the piezomagnetic d33 coefficient, the free permeability, μ33T, and the open-circuit elastic compliance coefficient, s33H, of grain-oriented Terfenol-D, Tb0.3Dy0.7Fe1.93, produced by a modified Bridgman technique. Prestress levels to 9500 psi (65 MPa) and magnetic bias fields up to 2200 Oe (1…
a' -Sialon ceramics promise the possibility of a reduction of the amount of glassy grain boundary phases by incorporating the oxides, present in the starting mixture as either sintering additives or impurities, into its rmallattice. It has been shown that techniques such as gas pressure sintering can be used successfu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray spectroscopic studies of nickel complexes, with application to the structure of nickel sites in hydrogenasesGerard J. Colpas, Michael J. Maroney, Csaba Bagyinka, Manoj Kumar, William S. Willis, Steven L. Suib, Pradip K. Mascharak, and Narayan BaidyaCite this: Inorg. Ch…
An equimolar mixture of poly(L-lactide) and poly(D-lactide) was crystallized into a stereocomplex whose crystal system is triclinic (P1) with cell dimensions: a = 0.916 nm, b = 0.916 nra, c (chain axis) = 0.870 nm, α = 109.2°, β - 109.2°, and γ = 109.8°. In the unit cell, a poly(L-lactide) segment and a poly (D-lactid…
Abstract A Fortran 77 computer program has been developed for the quantitative analysis of minerals by multiphase profile analysis of the complete powder diffraction pattern. Featured are full-matrix least-squares refinement of 14 Rietveld “instrumental parameters” (phase scales, asymmetry, preferred orientations (Mar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of sulfonic acid group on polyaniline backboneJiang Yue, Zhao H. Wang, Keith R. Cromack, Arthur J. Epstein, and Alan G. MacDiarmidCite this: J. Am. Chem. Soc. 1991, 113, 7, 2665–2671Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Pu…
Gelcasting is a novel method for molding ceramic powder based on a synthesis of concepts derived from traditional ceramics and polymer chemistry. Gelcasting of alumina is described in this paper. The process is based on the in situ polymerization of acrylamide monomers as the setting mechanism for forming the green bo…
As their name indicates, liquid crystals simultaneously exhibit some characteristics common to both ordinary isotropic liquids and solid crystals. This ambivalence is also found in the effects of surfaces on these systems which lead to a great diversity of phenomena. These phenomena are reviewed focusing on nematic li…
Review: The conversion of sunlight into electricity can be achieved using a solar cell and is one of the most attractive future soruce of energy. Silicon‐based cells, while quite efficient, are difficult and expensive to produce, a fact that drives up the cost of electricity produced using them. The alternative, organ…
Amorphous films having a component of the stoichiometric GeTe-Sb2Te3 pseudobinary alloy system, GeSb2Te4 or Ge2Sb2Te5 representatively, were found to have featuring characteristics for optical memory material presenting a large optical change and enabling high-speed one-beam data rewriting. The material films being sa…
The general theory of the transient plane source (TPS) technique is outlined in some details with approximations for the two experimental arrangements that may be referred to as ‘‘hot square’’ and ‘‘hot disk.’’ Experimental arrangements and measurements on two materials, Cecorite 130P and Corning 9606 Pyroceram, using…
Map interpretation remains a critical step in solving the structure of a macromolecule. Errors introduced at this early stage may persist throughout crystallographic refinement and result in an incorrect structure. The normally quoted crystallographic residual is often a poor description for the quality of the model.…
Two-photon absorption spectroscopy is used to investigate the 8 S 7/2 → 6 P J , 6 I 7/2 transitions of Gd 3+ ions in the cubic elpasolite Cs 2 NaGdCl 6 . The Gd 3+ ions occupy a centro-symmetric site (O h ); so the odd terms of the crystal field vanish and the pure electric dipole transitions should not be observed in…
Pb1−x−yCdxSry S/PbS/Pb1−x−yCdxSryS double-heterostructure lasers emitting at a midinfrared wavelength region were fabricated for the first time using molecular beam epitaxy. Effects of the lattice mismatches between active and confinement layers and also between substrate and confinement layers using a tilted substrat…
The variational principle based on the Gibbs-Bogoliubov inequality is used to map the thermodynamic and structural properties of a charge-polydisperse colloidal suspension onto those of a polydisperse reference hard-sphere fluid. The predictions of this mapping are tested by molecular dynamics simulation.
The calculation of implicit shift to the phonon energies for phonons in deuterated anthracene C 14 D 10 at q=0 is presented, the explicit shift having been already described. This implicit shift is then compared with the shift obtained by neutron scattering experiments and Raman measurements. The calculation of therma…
Real-time construction and reconstruction of Fresnel holograms is demonstrated using an optically-addressable ferroelectric liquid-crystal spatial light modulator with a resolution up to 175 line pairs/mm. A bright holographic image is read out due to the optical separation between the write and read sides by a dielec…
We present a phase diagram for fluid invasion of porous media as a function of pressure P and the contact angle \ensuremath{\theta} of the invading fluid. Increasing P leads to perculation above a critical ${\mathrm{\ensuremath{\theta}}}_{\mathit{c}}$, and depinning below ${\mathrm{\ensuremath{\theta}}}_{\mathit{c}}$.…
Porous silicon layers grown on nondegenerated p-type silicon electrodes in hydrofluoric acid electrolytes are translucent for visible light, which is equivalent to an increased band gap compared to bulk silicon. It will be shown that a two-dimensional quantum confinement (quantum wire) in the very narrow walls between…
Living polymerization techniques can be used to achieve a high degree of control over polymer chain architecture. Examples of the type of polymers that can be synthesized include block copolymers, comb-shaped polymers, multiarmed polymers, ladder polymers, and cyclic polymers. This control of structure, in turn, resul…