Materials Literature
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Details of the electronic bands near the Si–SiO2 interface were examined by the technique of determining the field dependence of the threshold Φ (ε) for internal photoemission. From a measurement of Φ (ε), the conduction band bottom φ (x) in the SiO2 was obtained to within approximately two lattice units of the interf…
The conductive properties of carbon black filled polymers have already found many qualitative applications while quantitative ones remain infrequent because of the number of unexpected parameters which influence the conductance of samples of the material. We have tried to connect the anomalous electrical behaviour of…
Using the concept of thermally activated mobility, a theory is developed to calculate the thermally stimulated current (TSC) in hopping systems as a function of temperature. Unlike the existing theories which describe only the band transport systems, the present theory is applicable to both band and hopping transport…
Abstract Polychloroprene, or neoprene, has been commercially available since 1932. Through the years the use of these polymers has continued to increase to an annual worldwide consumption of almost 300 000 metric tons (660 million pounds, Table I). This represents about 5% of the world market for elastomer. Polychloro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of Phenylacetylenes. 4. Effects of Tetraphenyltin and Initiation Mechanism in the WCl6-Catalyzed PolymerizationToshio Masuda, Kim-Quan Thieu, Noriaki Sasaki, and Toshinobu HigashimuraCite this: Macromolecules 1976, 9, 4, 661–664Publication Date (Print):July 1,…
Conductivity was measured for Li 4 SiO 4 and its solid solutions with Li 4 GeO 4 over a wide frequency range to separate clearly the effects of electrode polarization, conductance relaxations, etc., and to obtain true “dc” conductivities. The conductivities of all the electrolytes are markedly temperature‐dependent, r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo heteropoly anions containing organic groups. Crystal and molecular structures of ammonium pentamolybdobis(methylphosphonate) pentahydrate, (NH4)4[(CH3P)2Mo5O21].cntdot.5H2O, and sodium tetramethylammonium pentamolybdobis(ethylammoniumphosphonate) pentahydrate, Na[N(CH3)4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrigonal-prismatic vs. octahedral coordination in a series of tris(benzene-1,2-dithiolato) complexes. 1. Crystal and molecular structure of tris(benzene-1,2-dithiolato)molybdenum(VI), Mo(S2C6H4)3Martin. Cowie and Michael J. BennettCite this: Inorg. Chem. 1976, 15, 7, 1584–15…
Abstract The core and valence energy levels of a series of poly(alkyl methacrylates) have been studied by ESCA. Surface compositions have been determined both from a comparison of area ratios for the O 1 s and C 1 s core levels and from the relative areas for the individual component peaks for these levels. The eviden…
Abstract Equilibrium data for the sorption of oxygen, nitrogen, carbon monoxide, and methane in 5A molecular sieve are analyzed in terms of a simple theoretical model isotherm. The model provides an excellent correlation of the single‐component isotherms over the entire concentration range, and it is shown that equili…
Single crystal samples of reduced rutile used as anodes in a photoelectrochemical cell with show significant changes with use. Saturated photocurrent as a function of illumination wavelength and differential capacitance as a function of anode half‐cell voltage were measured before and after varying periods of operatio…
The temperature-dependent diffuse critical scattering associated with the Verwey ordering (${T}_{V}=122$ K) in magnetite (${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$) is extensively studied by means of neutron scattering experiments. The $q$ dependence of the scattering reveals that it is planar in nature and shown to arise…
Abstract The chemistry of p ‐xylelene and of its analogues has been reviewed. Its modes of formation and polymerization to poly‐ p ‐xylelene have been described, and the initiation and hypothetical termination steps have been discussed. The reactions taking place in the gas phase and in the deposited film are contrast…
The force-elongation properties of web fibers produced by the major ampullate gland systems of four species of orb-web-spinning spiders have been determined and compared with the corresponding properties of fibers obtained from the same gland systems by forcible silking. Although all such fibers are highly variable in…
Bulk magnetization measurements were made between 5 and 300 K in fields up to 14 kOe on a series of iron-chromium alloys containing from 2- to 70-at.% Cr. The temperature dependence of the magnetization was analyzed to yield spin-wave stiffness coefficients that are systematically different from values obtained direct…
Abstract The core and valence levels of a series of poly(alkyl acrylates) have been studied by ESCA. From an analysis of the individual component peaks for the C 1 s and O 1 s core levels and from comparison of relative area ratios it is shown that ESCA may be applied to the study of surface compositions. The evidence…
A rapidly converging method for refining approximate atomic models is presented. It combines the conditional structure-factor least-squares procedure described by Waser [Acta Cryst. (1963). 16, 1091-1094] with the conjugate gradient method for solving linear systems [Hestenes & Stiefel, J. Res. Natl. Bur. Stand. (1952…
The nonlinear relationship between current and voltage in the zinc oxide varistor arises from electrical barriers at the grain boundaries in the polycrystalline ceramic. At very low fields, thermionic emission accounts for the majority of the current, with Schottky emission becoming more important as the field increas…
Polycrystalline galena ore, previously deformed in experiments at room temperature, has been annealed at temperatures between 200 degrees and 700 degrees C over periods of up to 30 days. The influence of heating on the galena has been studied by measurement of indentation hardness, by observation of the grain textures…
The application of the technique of the central compound rotatable designs of Box and Hunter to the optimization of an open-end-spinning process is studied, and the advantages of using a minicomputer for such an analysis are discussed. The influence of the rotor diameter, rotor speed, and yarn twist on the characteris…