Materials Literature
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ADVERTISEMENT RETURN TO ISSUEArticleNEXTRADIATION CHEMISTRY OF POLYETHYLENE. V. HYDROGEN ISOTOPE EXCHANGE STUDIESMalcolm Dole and Francis CraccoCite this: J. Phys. Chem. 1962, 66, 2, 193–201Publication Date (Print):February 1, 1962Publication History Published online1 May 2002Published inissue 1 February 1962https://p…
Copper specimens were subjected to large dynamic tensions by colliding relatively thin plates with thick plates holding the samples. The collision first produces strong shock waves, from 300 to 600 kbar, that propagate in both directions from the impact interface. Subsequent interaction of the two rarefaction waves re…
"Introduction to Nuclear Engineering." Nuclear Science and Engineering, 12(2), pp. 315–316
Hardness values of 65 nonmetallic crystalline solids of 16 different structures are compared with data of a newly introduced concept: "the volumetric lattice energy." When such solids are classified according to a new interpretation of lattice anharmonicity, a set of linear interrelations is obtained which covers the…
Abstract The molecular weight distributions of polypropylene samples subjected to various degrees of thermal degradation were experimentally determined and compared with those expected theoretically for random scission of the polymer chains. The comparison demonstrated that the chain breakage is predominately random a…
The structures of the crystalline regions of cold-drawn fibres and highly oriented, stretched rubberlike specimens of polyethylene adipate (PEA) and polyethylene suberate (PES) have been determined. The unit cells are monoclinic with one chemical unit per fibre repeat and two chains per cell. The cell dimensions are:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of Hydrogen by a Transition Metal Complex at Normal Conditions Leading to a Stable Molecular DihydrideL. Vaska and John W. DiLuzioCite this: J. Am. Chem. Soc. 1962, 84, 4, 679–680Publication Date (Print):February 1, 1962Publication History Published online1 May 20…
A study was made of the rate of diffusion of alkali ions into a soda‐lime glass from nitrate melts, and the distortion of glass disks produced by the stresses thus developed was measured using an interference technique. A maximum of 124,000 psi was produced when Na + was replaced by K + . Tensile stresses accompanying…
Abstract Interlayering of 2: 1 layer silicates varies as a function of chemical weathering from the simple, homogeneous K or Na interlayers of micas to the heterogeneous systems of mica intercalated with expanded 2: 1 layer silicates. “Frayed edge” type of weathering at dislocation planes of mica is collated with K re…
An experimental evidence was given for the segregation of solute atoms to stacking faults in alpha-brass. The stacking fault energy in an alpha-phase solid solution with face-centered cubic structure usually decreases continuously with the increasing concentration of solute atoms. The solute atoms in that alloy tend t…
The linear thermal expansion of a 99.999% gold bar has been measured throughout the range 15\ifmmode^\circ\else\textdegree\fi{} to 1057\ifmmode^\circ\else\textdegree\fi{}C by direct observation of the length expansion $\frac{\ensuremath{\Delta}L}{L}$, with filar micrometer microscopes and by measurement of the lattice…
The crystallographic and dielectric properties of complex perovskites are described in terms of average A- and B-site ionic radii, charges, and electronic structures. The relative importance of these to the ferroelectric state is evaluated by a study of a number of solid solutions containing trivalent bismuth. Two new…
Sm2+ which occurs as impurity in very small concentrations in LaCl3 has a very distinctive fluorescence spectrum which resembles in all details that of Eu3+. Excitation is through the very strong continuous absorption to 4f55d in the visible. The energy is transferred to the stable states 5D0 and 5D1 of the 4f6 config…
The absorption bands characteristic of the solid molecular complexes of tetracyanoethylene are attributed to the charge transfer interaction between tetracyanoethylene and donor molecules. In the complexes with polycyclic aromatic hydrocarbons the energy gap associated with the semiconductivity agrees well with the en…
Vapor pressures of zirconium over zirconium diboride have been measured by the Knudsen technique over the temperature range 2150° to 2475°K. A new type of apparatus was constructed and used successfully in the study. Zirconium diboride was determined to evaporate congruently at a composition of ZrB1.906(+0.025 or —0.0…
The emission intensities of the rare-earth ions in inorganic compounds are sensitive to changes in structural parameters, the charge type of the cations, and rare-earth concentration. Comparisons of the fluorescence of Eu3+ in a number of related tungstates show that under long-wave ultraviolet excitation comparable s…
The enthalpies of mixing in the binary liquid mixtures of thallium nitrate with lithium-, sodium-, potassium-, and rubidium nitrate have been measured at 350°C. It is found that the molar enthalpy of mixing (ΔHM) varies in a somewhat irregular manner as the size of the alkali ion is varied. In this respect these syste…
Three new ferroelectrics belonging to a family of the general formula $[X{(\mathrm{C}{\mathrm{H}}_{3})}_{4}]\mathrm{Hg}{Y}_{3}$ (where $X=\mathrm{N},\phantom{\rule{0ex}{0ex}}\mathrm{P}$; $Y=\mathrm{C}\mathrm{l},\phantom{\rule{0ex}{0ex}}\mathrm{B}\mathrm{r},\phantom{\rule{0ex}{0ex}}\mathrm{I}$) were discovered. They ar…
Nucleation in ultrasonic cavitation is due to cosmic rays. The neutron component seems sufficient to explain the experiment in water, through the creation of oxygen recoil nuclei which would act as nucleating agents; energy deposit and radiolytic effects produce small overheated and oversaturated regions in which cavi…
The infrared spectra of 10 oxalato complexes have been obtained in the frequency range 4000 to 300 cm—1. A normal coordinate treatment made on the 1:1, metal:ligand model of the chelate ring of tris-(oxalato)-Cr(III) resulted in the assignment of metal-oxygen stretching bands in the range between 600 and 300 cm—1 for…