Materials Literature
文献浏览
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。
Stress softening in natural rubber vulcanizates. Part II. Stress softening effects in pure gum and filler loaded rubbers
Abstract Considerable stress softening (Mullins effect) occurs in both gum and filler loaded vulcanizates of natural rubber and SBR. When compared at the same stress, the extent of softening is similar in both gum and filled vulcanizates. The stress softening is shown to be mainly due to changes in the rubber phase in…
Stress softening in rubber vulcanizates. Part I. Use of a strain amplification factor to describe the elastic behavior of filler‐reinforced vulcanized rubber
Abstract Measurements of Young's modulus of vulcanized rubbers containing thermal carbon black show the predicted dependence on the volume concentration given by relationships derived for a suspension of spherical particles, for example, that due to Guth, Simha, and Gold which gives E = E 0 (1 + 2.5 c + 14.1 c 2 ). A…
Electron scattering on magnetic impurities in metals and anomalous resistivity effects
A special quantum field theory technique for a system of spins was used to evaluate the resistivity of metals containing paramagnetic impurities, assuming $J/{\mathrm{\ensuremath{\epsilon}}}_{F}\ensuremath{\ll}\mathit{1}$, for an arbitrary value of ($J/{\mathrm{\ensuremath{\epsilon}}}_{F}$) ln (${\mathrm{\ensuremath{\…
Optics and Spectroscopy
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text , "Optics and Spectroscopy," Appl. Opt. 4, 1192-1192 (1965) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
An approach to the problem of ionic distribution in liquid silicates
Abstract Liquid silicates have been treated as analogous to conventional polymers with a distribution of molecular weights which is governed by considerations of chemical equilibria. Ionic distributions have been calculated as a function of the silica content for several binary systems in regions more basic than the m…
Effect of Pressure on the Intermetallic Diffusion of Silver in Lead
The diffusion of silver-110 into lead has been investigated using radioactive-tracer techniques in a temperature range within 200\ifmmode^\circ\else\textdegree\fi{}C of the melting point of lead for six pressures between 0 and 40 kbar. The activation energy was found to increase from 15.2 to 21.9\ifmmode\pm\else\textp…
Cr3+Fluorescence in Garnets and Other Crystals
The results of a study of the sharp-line fluorescence of ${\mathrm{Cr}}^{3+}$ in a number of crystals is presented. The host crystals were several diamagnetic garnets, a spinel, and emerald. The results are used to discuss two aspects of the sharp-line energy levels. First, some of the dynamical aspects are considered…
Theory of the Yield and Fano Factor of Electron-Hole Pairs Generated in Semiconductors by High-Energy Particles
Yield of secondaries and ratio of variance to yield (Fano factor) are associated with a simple statistical model. This model applies almost independently of details of the physics, though introduction in it of refinements from band structure would be straightforward. The model is described in terminology of an equival…
Thermal Conductivity and Thermoelectric Power of Rutile (TiO2)
The thermal conductivity $K$ and the thermoelectric power $Q$ of single-crystal samples of rutile were measured from 2 to 300\ifmmode^\circ\else\textdegree\fi{}K. Pure, niobium-doped, vacuum-reduced, and hydrogen-reduced specimens were investigated. The thermal conductivity of the pure crystals is similar to that usua…
Theory of Anharmonic Crystals
The anharmonic contributions to the energy, specific heat, frequency-wave-vector dispersion relations and damping of phonons in a crystal have been studied using the recent technique of thermodynamic Green's functions based on field-theoretic methods. General expressions for these quantities have been deduced. It has…
Classical Diagram Technique for Calculating Thermostatic Properties of Solids; Application to Dielectric Susceptibility of Paraelectrics
A diagram technique suitable for calculating equilibrium classical statistical properties of solid dielectrics is developed. The method is applied to the temperature-dependent dielectric susceptibility and vibration spectrum of an anharmonic crystal. The techniques of "diagram summation" and "frequency renormalization…
Magnetic Properties of FeCl2·2H2O
The magnetic properties of Fe${\mathrm{Cl}}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O have been investigated by means of single-crystal magnetic susceptibility, high-field magnetization, and proton nuclear-magnetic-resonance (nmr) measurements. A transition to an antiferromagnetic state is obs…
Ferromagnetic Resonance in Metals. Frequency Dependence
The FMR (ferromagnetic-resonance) measurements were performed in single crystals of silicon-iron, nickel-iron, nickel, and hcp cobalt in the frequency region 8-140 Gc/sec at room temperature. The samples, in the form of thin discs, were statically magnetized parallel to the plane of the disc. Their thickness was at le…
Far-Infrared Lattice Absorption in Alkali Halide Crystals
Measurements of the absorption between 0.3 and 1.0 mm have been made on NaCl, KCl, KBr, KI, NaI, and LiF between room temperature and 15\ifmmode^\circ\else\textdegree\fi{}K. Present theory explains the absorption in this region as arising from "vertical" transitions from one phonon state to another with the same wave…
Low-Temperature Thermal Conductivity of Ferromagnetic Insulators Containing Impurities
The spin-wave thermal conductivity of ferromagnetic insulators with magnetic scattering is investigated. The role of magnon-magnon interactions is clarified. The magnetoelastic coupling is treated by the Green-function technique.
Selection Rules for Second-Order Infrared and Raman Processes in the Rocksalt Structure and Interpretation of the Raman Spectra of NaCl, KBr, and NaI
Group-theoretical selection rules are given for two-phonon infrared absorption and Raman scattering processes in crystals having the rocksalt structure. In common with the diamond structure, two-phonon overtones are infrared inactive. The selection rules for second-order infrared absorption processes in the rocksalt s…
Polarized Absorption and Emission in an Octacoordinate Chelate of Eu3+
Polarized absorption in the 5D2←7F0 transition and emission in the 5D0→7F2 transition of the Eu3+ ion have been obtained in monoclinic single crystals of the tetrahexylammonium salt of tetrakis diphenyl-propanedionoeuropium (III). Both sets of transitions consist of three lines, two polarizing strongly perpendicular t…
Optical Transmission of Graphite Compounds
Lamellar compounds of graphite are often, but not always, deeply colored. To study this color, a number of different compounds have been prepared from very thin flakes cleaved from annealed single crystals. The spectral transmission of these samples has been measured between 0.2 μ and either 2.2 μ or, in a few cases,…
Investigations of Hexanol-1 Multimers and Complexes by the Method of Dielectric Polarization in Weak and Strong Electric Fields
Results on dielectric polarization and its variations in strong electric fields are presented for solutions of hexanol-1 in hexane, benzene, 1,4-dioxane, and triethylamine. A method for calculating the dipole moments of multimers and complexes on the basis of experimental results is proposed. Also, the concentrations…