Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSTUDY OF THE CHANGE IN SPECIFIC HEAT OF MONOMERIC AND POLYMERIC GLASSES DURING THE GLASS TRANSITIONBernhard WunderlichCite this: J. Phys. Chem. 1960, 64, 8, 1052–1056Publication Date (Print):August 1, 1960Publication History Published online1 May 2002Published inissue 1 Augu…
The self-diffusion coefficient of oxygen has been determined as a function of temperature in single crystal and polycrystalline aluminum oxide at temperatures up to 1780°C. The rate of exchange between a gas phase and solid particles was measured, utilizing the stable isotope, O18. In single crystals of aluminum oxide…
The paper comprises theoretical and experimental studies of the lattice dynamics of alkali halides. A theory of the lattice dynamics of ionic crystals is given based on replacement of a polarizable ion by a model in which a rigid shell of electrons (taken to have zero mass) can move with respect to the massive ionic c…
Effects of magnetoresistance and extraordinary Hall effect on the propagation of electromagnetic waves through very thin sheets of ferromagnetic conductors are studied. These contributions to the conductivity produce electric fields varying like products of current and magnetization and introduce nonlinear interaction…
The magnetic after-effect in iron at high temperatures due to motion of dislocations is investigated. The specimens, consisting of a few large crystals, are examined, some after a careful annealing and some after a small plastic deformation. The intensity of the after-effect is measured as the horizontal displacement…
Measurements of the absorption coefficient between 10 and 300 ${\mathrm{cm}}^{\ensuremath{-}1}$ have been made with crystals of CdS in polarized light between 20 and 300\ifmmode^\circ\else\textdegree\fi{}K, at wavelengths near 5000 A. Analysis of the results at various temperatures near 70\ifmmode^\circ\else\textdegre…
Relative changes in macroscopic length, $\frac{\ensuremath{\Delta}L}{L}$, and x-ray lattice parameter, $\frac{\ensuremath{\Delta}a}{a}$, of a 99.999% silver bar have been measured from 14 to 956\ifmmode^\circ\else\textdegree\fi{}C, using a rigid parallel pair of filar micrometer microscopes and a rotating single-cryst…
The conduction-electron diamagnetism has been calculated for the three-dimensional band structure of graphite. The magnetic energy levels are found and the susceptibility calculated by analytically carrying out the free energy sum. Agreement with experiment is found for values of the band parameters nearly equal to th…
An expression is obtained for the lattice thermal conductivity at high temperatures in the limit when the scattering of phonons by point defects is stronger than by umklapp processes. The latter limit the phonon mean free path at low frequencies and most of the heat is transported at frequencies such that the point de…
Abstract Farbige Cyanketone, die aus ω‐Chloracetyl‐trimethylmethylenindolinen mit Kaliumcyanid und Kondensation der so erhaltenen Cyanacetylderivate mit Aldehyden gewonnen werden, wurden spektralphotometrisch untersucht. Ihre Absorptionsspektren lassen sich durch Annahme innermolekular‐ionoider Grenzstrukturen deuten.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadiochemical Determination of Radium in Uranium Milling Process SamplesH. G. Petrow, O. A. Nietzel, and M. A. DeSesaCite this: Anal. Chem. 1960, 32, 8, 926–927Publication Date (Print):July 1, 1960Publication History Published online1 May 2002Published inissue 1 July 1960htt…
mole fraction of liquid-soluble, solid-insoluble impurities as determined by the freezing point depression. This corresponds to a purity of 99.999 mole percent. Many of the impurities, including organic matter, are removed by oxidation with sulfuric and nitric acids. The nonvolatile impurities are removed on distillin…
The system CaSO4-NaCI-H2O-CO2, part of the system CaCO3-CaSO4-NaCl-H2O-CO2, was investigated through a range of NaCl concentrations. Calcite and gypsum solubilities were studied under conditions approximating those of the natural environment as closely as possible, for the particular purpose of determining the behavio…
Abstract A theory of adhesion of polymers to each other is suggested ; according to it adhesion of dissimilar polymers as well as auto-adhesion is explained by the diffusion of chainlike molecules segmentally or otherwise. Starting with this theory, the effects of various factors on the adhesion of polymers to each ot…
Abstract Kinetic equations were derived for polymer chain degradation. The usual type of initiation‐depropagation‐termination mechanism was postulated. Chain transfer was ignored. Random and terminal initiation were considered as well as unimolecular, bimolecular, and no‐termination (complete unzipping). It was assume…
The conductivity of a number of barium titanate single crystals was measured as a function of temperature, applied field, electrode material, thickness and time. Typical results are given, and tentative theories put forward to account for the observed activation energies, the striking non-ohmic nature of the conductiv…
The angular distributions of secondary electrons from (001) faces of copper and nickel single crystals have been measured for secondaries in four energy ranges (0-10 ev, 10-20 ev, 20-40 ev, and 40-90 ev) for primary electron energies of 250, 500, and 800 ev. Fine structure was observed which consisted of weak peaks in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE HEAT CAPACITY AND THERMODYNAMIC FUNCTIONS OF URANIUM FROM 5 TO 350°K.1Howard E. Flotow and Harold R. LohrCite this: J. Phys. Chem. 1960, 64, 7, 904–906Publication Date (Print):July 1, 1960Publication History Published online1 May 2002Published inissue 1 July 1960https://…
A grooved, tensile type, accelerated stress corrosion test is described by which austenitic stainless steels were tested in both the solution and the vapor phase of boiling 42 percent magnesium chloride. Of the commercial alloys tested, Types 310 and 314 stainless steel offered considerably greater resistance to crack…
Single crystals of anthracene have been grown from melts of zone-purified material, in an all-glass oven. The important factors which governed the successful growth of single crystals by the moving-vessel technique have been investigated, viz. the purity of the anthracene, the temperature gradient, the shape of the gr…