Materials Literature
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An investigation is made of the relationship between the coefficients of the electrooptic effects and the tensors of the nonlinear electric susceptibilities. The form of the tensor K, which describes the fourth-order nonlinear electrooptic effect, is found for crystals having 42m symmetry. The results are given of pol…
The $\mathrm{Cu}(100)c(2\ifmmode\times\else\texttimes\fi{}2)$-CO and $\mathrm{Ni}(100)c(2\ifmmode\times\else\texttimes\fi{}2)$-CO structures have been examined by dynamical low-energy electron diffraction intensity analysis using the (00), (\textonehalf{}\textonehalf{}) and (10) beams measured at 80 K (Cu) and 120 K (…
It is shown that thin layers of Pd or Pt enhance the uptake rate of hydrogen into bulk Nb with almost every hydrogen atom that hits the surface passing into the bulk. A model for the kinetics is formulated showing that in a composite-system large uptake rates are achieved by combining the surface properties of Pd with…
E.S.R. study of radiation damage in a single crystal of sodium dimethyl arsonate L'irradiation aux rayons X, à 77 K, d'un monocristal de diméthylarsinate de sodium provoque le piégeage de \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm CH}_{\rm 3} \left({\rm O} \right){\rm As}\left({{\rm O}^ -} \right)\…
The elastic parameters of dislocations in rutile crystals in the temperature range from 100 to 298 K are determined by numerical calculations in terms of an anisotropic elasticity theory. The results are applied to possible dislocation reactions and elastic stress fields of dislocations. The energy factor of edge disl…
Experimental observations of jogs on dissociated dislocations are discussed. It is shown that using the weak-beam technique of electron microscopy both extended and apparently contracted jogs can exist on the same dislocation: the extension of jogs depends on several factors including the height of the jog and the cha…
The measured charge transport characteristics of vitreous 0.55 As2S3: 0.45 Sb2S3 are analysed on the basis of a theory developed for the anomalous carrier drift, controlled by capture in traps distributed in energy. For the case of an exponential trap distribution the dependence of the activation energy εa on the fiel…
The temperature dependence of the dielectric constant of Cs${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ shows a crossover between a region ($3 \mathrm{K}<~T\ensuremath{-}{T}_{c}<~90 \mathrm{K}$) dominated by one-dimensional correlations and a region ($0 \mathrm{K}<~T\ensuremath{-}{T}_{c}<~3 \mathrm{K}$) dominated…
The simultaneous clustering of irradiation produced vacancies and interstitials in metals is investigated using the rate theory approach. Rate equations are used to describe the time-dependent concentrations of point defect clusters. Size-dependent bias factors and self-consistent reaction rate constants are used to e…
The luminescence properties of calcium molybdate are reported. Two emission bands are observed, one in the green and another in the orange spectral region. The shorter wavelength emission band is assigned to the 3T1 → 1A1 transition in the tetrahedral molybdate group. The longer wavelength band is ascribed to a simila…
The admittance $Y=G+j\ensuremath{\omega}C$ of amorphous silicon films, produced by electron-beam evaporation, has been measured at frequencies between dc and ${10}^{7}$ Hz, and at temperatures between 150 and 400 K. At low frequencies the conductance $G$ was nearly independent of frequency, an exponential function of…
Indium and indium 10% tin oxide films have been produced on room-temperature insulating substrates and have exhibited high conductivities which compare with the best reported for films made at substrate temperatures of 450 °C and higher. They were made by the evaporation and sputtering of the metals in an atmosphere o…
All measurements of thermal conductivity and ballistic phonon propagation in crystals of deformed LiF over the temperature range 0.03-25K are consistent with an interpretation in which the slow transverse phonons are scattered with much greater probability by dislocations than are fast transverse phonons. The scatteri…
The electron transfer absorption bands of the divalent transition metal ions V, Cr, Mn, Fe, Co, Ni, and Cu in LiCl host crystals have been measured up to the absorption edge of LiCl at 1500 Å. The band assignments and average energies of electron transfer are given. The average energies can be fitted to empirical equa…
Highly elastomeric ’’model’’ networks were prepared by end-linking polydimethylsiloxane chains of known molecular weight, using a tetrafunctional orthosilicate. The reactions were carried out in both the undiluted state and in solution, with n-dodecane, cyclic dimethylsiloxane oligomer, and linear dimethylsiloxane oli…
An investigation of the low frequency Raman scattering spectra of the alkali metaphosphate glasses (MPO3)n (M=Li,Na,K,Cs) has revealed in the calculated Raman spectral density of states a low frequency band of oscillators between 30 and 70 cm−1. The frequency of the band maxima were found to vary directly as the metal…
Transmission and reflection spectra of solid neon in the valence-exciton range ($16\ensuremath{\le}h\ensuremath{\nu}\ensuremath{\le}22$ eV) have been carefully reinvestigated using highly monochromatized ($\ensuremath{\Delta}E=4$ meV) synchrotron radiation. A surface-exciton state at $h\ensuremath{\nu}=17.15$ eV locat…
In Parts I and II of this series, we have made use of a finite field perturbated INDO scheme to compute molecular hyperpolarizabilities, to discriminate through simple symmetry considerations between respective σ and π electronic contributions, and to test these ideas on smaller size benzene monosubstitutes. Following…
Abstract The rate at which an additive is lost from the surface of its solution in a polymer is considered to depend upon three factors—the solubility of the additive, the rate at which it volatilizes from the polymer surface, and its diffusion coefficient within the bulk of the polymer. By adapting the mathematics of…
Quantum photoyield and secondary-electron distributions are presented for an unreconstructed diamond (111) surface (type-$\mathrm{II}b$, gem-quality blue-white semiconductor). This chemically inert surface exhibits a negative electron affinity, resulting in a stable quantum yield that increases linearly from photothre…