Materials Literature
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A two-dimensional polynomial method is described which allows rapid evaluation of bond-scattering factors in a structure factor least-squares program. Correlation effects between electron population parameters are analyzed. It is concluded that simultaneous refinement of 2s2 and three 2p2 one-center populations is not…
Kazuhiro Tsuji, Michio Sorai, Syûzô Seki; New Finding of Glassy Liquid Crystal – a Non-equilibrium State of Cholesteryl Hydrogen Phthalate, Bulletin of the
Enthalpy content measurements on pure KCl, AgCl, CuCl, PbCl 2 , Ag 2 S, and PbS were made at temperatures up to 1000 °C using a sapphire calibrated drop calorimeter. Similar measurements were performed on AgCl–Ag 2 S and AgCl–KCl melts. These results determined values for the integral enthalpy of liquid–liquid mixing.
Abstract The effect of temperature and strain rate on the compressive yield behavior of polystyrene is compared with the effect of the same variables on crazing in tension. The results support the conclusion of other, more extensive work, which shows that crazing involves the same types of molecular processes as those…
Abstract The effect of ammonium sulfate, ammonium chloride, potassium chloride, calcium chloride, aluminum chloride, and copper sulfate added in amounts corresponding to 0.2, 2, and 20 atm concentration on mineralization of soil nitrogen in three soils was measured over a 30‐day period. Significant increases were prod…
Abstract Dynamic mechanical measurements were carried out as a function of temperature (−100 to + 180°C) and frequency (3.5 to 110 cps) for a series of aliphatic terpolyamides, nylon 6 and nylon 12. Effect of crosslinking with toluene diisocyanate, of absorbed water, and of frequency are used to estimate the statistic…
The electrical discharge characteristics of SF6 are discussed theoretically in relation to the field dependence of the ionization coefficient a and the electron attachment coefficient The results are compared with the characteristics of air. A simple theoretical formulation of breakdown or corona inception voltages of…
Abstract Several different schools of workers have dominated research in the field of polymer mechanochemistry. These include the Russian school with Baramboim, Berlin, Butyagin; Watson, Ceresa and others of the Natural Rubber Producers' Research Association; and a host of other European workers. Also active are the J…
X-ray diffraction phenomenon, for which the glancing angle of the incident beam is so small that the effect of specular reflection can not be neglected, is studied theoretically. Two wave fields, one of which is usually neglected, are considered as the solution of the dispersion equation, and the boundary conditions o…
X-ray diffuse scattering from disordered alloys is the primary direct source of information concerning the Warren parameters which describe the existing state of order. However, the short range order diffuse intensity is obscured by other contributions to the diffraction pattern resulting from static atomic displaceme…
Abstract Conductivity σ and thermoelectric power α of SeTe mixed crystals have been measured in the temperature range from 100 K up to the melting points. The activation energy of the intrinsic conductivity shows a relatively complicated dependence on alloy composition, which can be explained by a transition from the…
Neutron-diffraction measurements have shown that FeP is magnetically ordered below 125 \ifmmode^\circ\else\textdegree\fi{}K. The magnetic structure is a "double helix," propagating along the $c$ axis of the Pnma crystal structure with a period of 29.2 \AA{}. The magnetic structure allows two different sites for the ir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPulse radiolytic investigation of Oaq- radical ionsJoseph Rabani and Dov ZehaviCite this: J. Phys. Chem. 1971, 75, 11, 1738–1744Publication Date (Print):May 1, 1971Publication History Published online1 May 2002Published inissue 1 May 1971https://pubs.acs.org/doi/10.1021/j100…
Abstract A simple method combining macroscopic and microscopic features is proposed to calculate approximate values for Meyer's piezoelectric coefficients. The numerical result suggests that the piezoelectricity of liquid crystals is weak and its effect on alignment fluctuations mostly negligible.
The Percus–Yevick equation has been adapted for a two-dimensional system of particles interacting via noncentral forces. A pair potential operating between two particles has been constructed with the intention of reproducing some properties of a sample of such particles which will be similar to the ones encountered in…
Abstract The mobilities of polymer chain segments in mixtures of rubber and carbon black were investigated by nuclear magnetic resonance. Spin–spin relaxation time ( T 2 ) measurements on cis ‐polybutadiene and ethylene–propylene–diene rubber (EPDM) bound rubbers detected at least two relaxing regions: an immobile reg…
The crystal chemistry of point defects in lead zirconate‐titanate is discussed. The results are used to interpret sintering and grain‐growth behavior. Lattice vacancies are created thermally, by substitutional impurities with incorrect valences, and by changes in stoichiometry. Charged O vacancies are introduced when…
As a preliminary to describing the dislocation distribution in deformed alloys of copper containing a small volume fraction of SiO2 particles, the stress distribution in such an alloy is calculated on the assumption that no plastic relaxation takes place around the particles. The continuum approximation is used, and i…
A study by transmission electron microscopy of plastic relxation at undeformable spherical silica particles in a matrix of copper which has undergone plastic deformation leads to an understanding of the dislocation processes involved. The major process is the formation of dipoles of prismatic loops, either of primary…
Abstract Carbon black does not exist as single spherical particles but forms itself into a rodlike primary structure. These rodlike structures then form into an aggregated secondary network. This secondary network is believed to be held together by Van der Waals-London attraction forces. The decrease in shear modulus…