Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
First- and second-order Raman scattering from graphite has been studied. The second-order spectra of single crystals and of highly oriented pyrolytic graphite are continuous and exhibit several well-defined bands which can be attributed to features in the density of vibrational states as determined from current lattic…
Semiempirical molecular orbital calculations have been carried out on some of the common substitutional species in diamond-nitrogen, boron, silicon, oxygen, and the nitrogen pair. The results show that this model reproduces many of the electronic and vibrational properties of these defects extremely well. In particula…
Two semiempirical crystal orbital schemes are outlined for the calculation of the properties of perfect and defective solids. Both use periodic boundary conditions with a large unit cell (LUC) to map special points of the Brillouin zone onto the point k=0. One method involves the complete neglect of differential overl…
The results of a neutron diffraction study on the short-range order in the TeO 2 -Li 2 O glassy system are presented. On the basis of the obtained atomic radial distribution function a model for structural recombination in TeO 4 tetrahedra for tellurite glasses is proposed. This model takes into account the influence…
(Second of Two Parts)How Do Defects in Biosynthesis Explain Genetic Diseases of Collagen?There are many rare genetic diseases that involve connective tissues, such as skin and bone.As the information reviewed above about collagen structure and biosynthesis accumulated, biochemical data were quickly obtained to explain…
Rates of plagioclase crystal growth at constant temperature have been measured for a series of compositions in the system CaAl 2 Si 2 O 8 (An)—NaAlSi 3 O 8 (Ab). A microscope heating stage was used at temperatures near the liquidus to observe and photograph the growing crystals, and a resistance furnace quenching tech…
We present a theory to explain the anomalous enhancement of light scattering from molecules adsorbed at a metal-solution interface. It is found that tunneling of electrons between a surface molecule and the metal induces a resonance at a point in the vicinity of the Fermi surface. A dynamical equilibrium due to photoi…