Materials Literature
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Analysis of the temperature-dependent decay of surface voltage on an amorphous film after charging but prior to exposure (xerographic dark decay) and of residual decay after exposure can, in combination, be used to map the density of states and position the Fermi level. The procedure is illustrated for $a$-Se where bo…
A reexamination is made of previous resistivity data of the Ti${\mathrm{O}}_{0.80\ensuremath{-}1.23}$ metallic oxide system, in which very large positive and negative temperature coefficients of resistivity $\ensuremath{\alpha}$ are observed. Ti${\mathrm{O}}_{0.80\ensuremath{-}1.23}$ samples contain a large number of…
The electronic density-of-states and the partial-density-of-states functions for the 14 primary bands of the $\mathrm{AB}{\mathrm{O}}_{3}$ cubic $d$-band perovskites are derived as simple, closed form, analytical formulas with the use of an empirical linear-combinations-of-atomic-orbitals model. Comparisons of the mod…
Recent experimental evidence has established that the scattering of phonons by dislocations at low temperatures in [110] LiF rods is primarily a dynamic rather than a static process, but calculations of the effects of vibrating dislocations have failed to provide quantitative agreement with experimental observations o…
The interaction of H2O with the clean Fe(110) surface, Fe(110) surfaces with absorbed oxygen, and Fe(110) surfaces after bulk oxygen penetration were investigated using UPS. At 225 K, surface absorbed hydroxyl groups are present on all surfaces studied. On initially clean Fe(110) and surfaces with up to half monolayer…
Two clearly defined and chemically inequivalent Sn sites in the alloy glass (${\mathrm{Ge}}_{0.99}$${\mathrm{Sn}}_{0.01}$)${\mathrm{Se}}_{2}$ are observed using M\"ossbauer spectroscopy. These sites are identified with Sn impurity atoms replacing Ge in tetrahedral ${\mathrm{G}\mathrm{e}({\mathrm{Se}}_{1/2})}_{4}$ unit…
${\mathrm{Cd}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}$ Te alloys possess a homogeneous crystal phase having a zinc-blende structure for $0\ensuremath{\le}x\ensuremath{\le}0.7$. Their Raman spectra exhibit two pairs of sharp lines characteristic of the zone center "CdTe-like" and "MnTe-like" LO-TO modes. Some quasicontinu…
It is shown that by using the conical diffraction mount existing echelle gratings can be used at grazing incidence to achieve high spectral resolution in the extreme UV and soft x rays. Design considerations for grazing incidence echelle spectrographs are examined, and two sample designs are discussed. The first, for…
The OH-stretching fundamental, and the first, second, and third OH overtone vibrations have been examined using pure, GeO2-doped, graded index, fused silica optical fibers having OH contents from <1 ppm to ≳103 ppm. The previously reported component substructure of the fundamental OH-stretching contour was foun…
A coupled Hartree–Fock method with individual gauge for localized orbitals (IGLO) proposed previously is reformulated and applied to the calculation of the magnetic susceptibility χ and the chemical NMR-shifts σ of various small molecules. The agreement with experiment is usually very good. Unlike in traditional metho…
Spin waves, elastic waves and their magnetostrictive coupling in KNiF 3 are studied as functions of temperature and of applied magnetic field by Brillouin scattering and ultrasonic measurements. The light scattering data provide the magnetic and elastic coefficients; in addition, they enable magnetostrictive coefficie…
From measurements of ultrasonic wave velocities the elastic constants of mercury selenide, HgSe, have been obtained as a function of hydrostatic pressure up to that (P t =9.5*10 8 Pa=9.5 kbar) at which the densification phase transition to the cinnabar structure takes place. At room temperature the elastic constants a…
A simple theoretical study of the linear electro-optic effect is presented. This semiclassical approach is based on the single-energy-gap model, the dielectric theory and the concepts of bond charge and effective ionic charge. A general expression is obtained for the electro-optic coefficient of a crystal and is appli…
Abstract Die Halbstufenpotentialefür die Redoxpaare der Phthalocyaninatokomplexe von Mg(II), Zn(II), Cd(II), Hg(II), Pb(II) und von Al(III), Ga(III) und In(III) mit axialem Cl‐Liganden sowie von Si(IV) mit zwei axialen t‐Amyloxy‐Liganden wurden bestimmt.
Abstract The plasticity and viscoplasticity of polycrystalline materials are studied analytically in terms of lattice dislocations, with the principal effects attributed to non-extended obstacles. Non-equilibrium statistical mechanics is used to describe the evolution of the dislocation structures during loading and…
The correct postal code is Edinburgh EH93JZ.Equation (2) should read 8 R' $(R)dR =P(T,R ') ""' 'exp -' + [1+O(e,T,R ')], To El d R «+'&~d «+ & (2p) &" +'& =2/&[
A single heat transfer measurement technique was used to determine the thermal insulating capabilities of four materials used in outdoor clothing-goose down, wool, polyester, and polyolefin. It was found that all provide very similar degrees of insulation.
Asahi Chemical started research and development of the ion-exchange membrane chlor-alkali process in 1966. Research was carried out on the effects of the type of ion-exchange group, ion exchange capacity, degree of crosslinking, membrane structure, caustic concentration, and many other parameters on current efficiency…
The past 15 years have witnessed an explosive growth in the literature on ionomers, i.e. ion-containing copolymers in which up to 15 mol % of the repeat units contain ionic groups. Two monographs have appeared on the subject(1,2), as well as proceedings of several symposia(3), in addition to a large number of individu…
Two approaches are proposed to describe a system of interacting rotors. The version developed of the self-consistent-field approximation, explicitly including simplifications related to the quasi-oscillatory nature of molecular motion in the orientationally ordered phase, makes it possible to consider anharmonic effec…