Materials Literature
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The equilibrium electrical conductivity of polycrystalline, calcium‐doped BaTiO 3 was studied over the oxygen partial pressure range 10 ‐13 to 10 5 Pa and the temperature range 800° to 1000°C. There is little effect if CaO is substituted for a corresponding amount of BaO, i.e., Ba, 1‐x Ca x TiO 3 . If CaO is substitut…
Abstract The surface‐enhanced Raman scattering of benzenethiol was investigated in a silver sol. It was found that benzenethiol was chemisorbed dissociatively on the silver surface by rupture of its SH bond and the benzenethiolate formed on adsorption was bound to silver via its sulphur atom. Using the electromagneti…
The frequency dependence of viscoelastic properties of a branched polymer sample near its gelation threshold has been studied in oscillatory measurements. The results are in agreement with De Gennes' analogy relating the critical behaviour of the elastic moduli G ' and G '' to the electrical conductivity of percolatio…
It should be apparent from the contents of this review that no single method provides a full characterization of particle size and/or particle size distribution in supported metal catalysts without some inherent theoretical shortcoming, experimental difficulty, or ambiguities in interpretation of results. The message…
Adsorption isotherms of four plasma proteins (fibrinogen, IgG, human serum albumin, and bovine serum albumin) using four different types of small particles as substrates (siliconized glass, Teflon, polyvinylchloride, and Nylon-6,6) are reported. The suspending liquid medium was phosphate-buffered saline, with a surfac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectra of magnesium-sodium-borate glasses. 2. Raman and mid-infrared investigation of the network structureE. I. Kamitsos, M. A. Karakassides, and G. D. ChryssikosCite this: J. Phys. Chem. 1987, 91, 5, 1073–1079Publication Date (Print):February 1, 1987Publicatio…
Abstract A variety of gold catalysts can be used to catalyze the oxidation of carbon monoxide at temperatures as low as −70 °C and are stable in a moistened gas atmosphere. The novel catalysts, prepared by coprecipitation, are composed of ultra-fine gold particles and one of the oxides of 3d transition metals of group…
The present state of the study of the processes involved in the polymerisation, initiated by radiation, of monomers adsorbed on solid surfaces has been examined. Particular attention has been paid to the results of work on the quantitative description of the elementary stages of polymerisation on a surface. The biblio…
Electronic band structures of intercalation compounds of 3d transition metals with TiS 2 are calculated for the non-magnetic state by a self-consistent augmented-plane-wave method. The energy dispersion and density of states calculated for Fe 1 3/TiS 2 , FeTiS 2 and CrTiS 2 are discussed in connection with chemical bo…
JORGE HELLER / SRI In te rna t iona l , Menlo Pa rk , California I . Diffusion-Controlled Devices 180 A. Monolithic Devices 180 B . Reservoir Devices 181 C. Examples of Diffusional Devices 184 I I . Solvent-Control led Devices 187 A. Osmotically Controlled Devices 187 B . Examples of Osmotic Devices 188 C. Swelling-Co…
From the analogy between the collective quadrupole decay among compound nuclear states in strongly rotating nuclei and the phenomenon of nuclear magnetic resonance, it is possible to formulate a model of nuclear rotational damping which exhibits interesting correspondences between nuclear and atomic statistical proces…
It is proposed that a molten alloy may contain a 104-atom cluster with icosahedral symmetry and largely icosahedral packing. The cluster may be described as involving twenty interpenetrating Friauf polyhedra. On rapid freezing these clusters form cubic crystals related to the \ensuremath{\beta}-W structure. The struct…
Molecular dynamics was used to refine macromolecular structures by incorporating the difference between the observed crystallographic structure factor amplitude and that calculated from an assumed atomic model into the total energy of the system. The method has a radius of convergence that is larger than that of conve…
The recently discovered order-disorder transformations in pseudobinary semiconductor alloys AxB1−xC are shown to belong to a broader class of such transformations in AnB4−nC4 semiconducting compounds (e.g., chalcopyrites, for n=2). Strain energy, set up by the atomic size mismatch between the A–C and B–C bonds, is sho…
An experiment is performed in which a topological line defect (S=-(1/2)) is forced to move with constant speed c under the action of an applied voltage V. We argue that the line speed is determined by a competition between the viscous damping and the free energy that the system gains by displacing the line, so that c=…
Impurity-dopant effects on grain-boundary cohesion have been studied in a first-principles local spin-density atomic-cluster model of octahedral hole sites in nickel. Rigorous calculations of the total energy and gradient forces on the host atoms show that boron (an enhancer of cohesion) increases the maximum sustaina…
A quasi two-dimensional open Fermi surface with perfect nesting in the third direction is unstable in a magnetic field, versus the formation of density wave phases with quantized wave vectors. We prove that, within the same theoretical model, the Hall conductivity is exactly quantized at zero temperature in each field…
The distributions of activation energies for electromigration damage in Al and Al-4%Cu thin-film interconnects were determined using temperature-ramp resistance analysis to characterize electromigration. The activation energies for the pure aluminum conductors are well represented by a normal distribution. It is noted…
The results of a powder neutron diffraction study of the cubic fluorite solid solution U 1- x Np x O 2 ( x = 0.25, x = 0.75) are presented. For x = 0.25, an antiferromagnetic type- I order appears below T N = (16.5 ± 0.2) K with an ordered magnetic moment μ = (1.8 ± 0.1)μ B . For x = 0.75 the solid solution is magneti…
We derive the generating functional of thermal Green's functions for an interacting electron-phonon system through the use of functional integrals in holomorphic representations (c numbers for phonons and Grassmann numbers for electrons). These integrals are over paths obeying one-sided boundary conditions at either 0…