Materials Literature
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Abstract Ring compounds such as trioxane, β‐propiolactone, diketene, and 3,3‐bischloromethylcycloxabutane can be polymerized only in the solid state by γ‐radiation. These ring compounds polymerize by a ring‐opening, ionic mechanism to highly crystalline, high molecular weight, linear polymers. In general, the conversi…
Optical properties of two-layer antireflection systems are discussed. Theory is applied to study the optical performance of bismuth-oxide/magnesium-fluoride bilayers. The theoretical study includes graphs and numerical tables showing the spectral reflectances for different glass substrates, the effect of film-thicknes…
The observed stability relations of enstatite, protoenstatite, and clinoenstatite were in good agreement with the findings of earlier workers. Polycrystalline preparations of MgSiO 3 polymorphs were synthesized with the aid of small additions of MgF 2 or LiF as mineralizers. At 1042°± 3°C, enstatite, the stable low‐te…
Investigations were made to study the formation of and corrosion resistance of aluminum oxide films formed by reaction between aluminum and water (or wet steam) at 98-155 C. Attention was centered largely on boehmite films. Methods used for investigation of hydrated oxide films on aluminum surfaces (involving dissolut…
The mineralogy of carbonate sediments from Campeche Bank and Bermuda has been studied by use of X‐ray diffraction techniques. The sediment mineralogy appears to be mainly controlled by the skeletal mineralogy and size of organisms living locally. Selective physical destruction and transport and selective solution of m…
M\"ossbauer measurements of ${\mathrm{Fe}}^{57}$ were made on ferromagnetic ${\mathrm{Fe}}_{4}$N, which has a face-centered cubic arrangement of iron atoms with nitrogen at the body-center position. The hyperfine fields are 345 koe for the corner Fe and 215 koe for the three face-center Fe, approximately proportional…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTON THE RELATION BETWEEN CRYSTALLIZATION RATE AND LIQUID STRUCTUREDavid TurnbullCite this: J. Phys. Chem. 1962, 66, 4, 609–613Publication Date (Print):April 1, 1962Publication History Published online1 May 2002Published inissue 1 April 1962https://pubs.acs.org/doi/10.1021/j10…
The anomalous Hall effect and the magnetoresistance of ferromagnetic metals are investigated on the basis of the localized d-electron (or f-electron) model. First the Hamiltonian of the interaction between condition electrons and localized electrons is given, which is valid when the orbital angular momenta of localize…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Stability of Some Organic Compounds.I. B. Johns, E. A. McElhill, and J. O. SmithCite this: J. Chem. Eng. Data 1962, 7, 2, 277–281Publication Date (Print):April 1, 1962Publication History Published online1 May 2002Published inissue 1 April 1962https://pubs.acs.org/doi…
Abstract Linear polyphenylene sulfide has been synthesized by the condensation polymerization of alkali metal salts of p ‐halothiophenols. The monomers investigated included the lithium, sodium and potassium salts of p ‐bromothiophenol and the sodium salts of p ‐fluoro‐, p ‐chloro‐, p ‐bromo‐, and p ‐iodothiophenol. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew, Highly Active Metal Catalysts for the Hydrolysis of BorohydrideHerbert C. Brown and Charles A. BrownCite this: J. Am. Chem. Soc. 1962, 84, 8, 1493–1494Publication Date (Print):April 1, 1962Publication History Published online1 May 2002Published inissue 1 April 1962https…
Several compounds with m = 2, 3, 4, and 5 in the general formula (Me 2 ′O 2 ) 2+ (Me m–1 R m O 3m+1 ) 2– were synthesized, a number of them for the first time. They possess a layer‐type crystal structure. Bi 3+ may be the only suitable ion for the Me′ sites; R may be Ga s+ , Ti 4+ , Nb 5+ , or Ta 5+ . The restrictions…
The exchange interaction that gives rise to ordered magnetic states depends upon interatomic spacing. If the lattice is deformable, then a spontaneous distortion of the lattice will occur in the ordered state. We have calculated, in the molecular field approximation, the properties of a system in which the exchange en…
Bacteria-free clones of the small centric diatom Cyclotella nana Hustedt were isolated, three from estuarine localities, one from Continental Shelf waters, and one from the Sargasso Sea. Detonula confervacea was isolated from Narragansett Bay. Morphology of all clones was studied with the light and electron microscope…
Abstract The thermal transformations which take place in solid ammonium nitrate have been studied with the following techniques: differential thermal analysis, measurement of d.c. electrical conductance, optical microscopy, X-ray diffraction and nuclear magnetic resonance. It has been found that in dry ammonium nitrat…
The structures of the clay minerals are reasonably well known, but greater detail and more precision are needed if the properties of clays and soils are to be fully understood. For example, the selective adsorptive and catalytic properties and the reaction with organic materials vary with the character of the clay min…
The Zeeman-split quadrupolar resonances for Ba137 in BaBr2·2H2O were measured by using coincident enhanced proton resonance as a detector. The principal axes of the electric field gradient were found to be oriented thus: x parallel to b, y parallel to c, and z perpendicular to the bc plane. a, b and c are the crystall…
A generalized formulation of the diffusion-kinetic model of track effects in radiation chemistry is presented and criticized. It permits consideration of complex mechanisms, arbitrary initial distributions and radical correlation effects. Methods for the numerical integration of the associated differential equations o…
Localized lattice modes can contribute to the strain at a paramagnetic impurity and thus influence the spin-lattice interaction. Their contribution to the spin relaxation is estimated. It is governed by the rate with which a local mode attains equilibrium with the phonon continuum, estimated in a previous paper. Studi…
The microwave losses in both pure and doped SrTi${\mathrm{O}}_{3}$ have been investigated as a function of frequency and temperature. It is found that the loss tangent is proportional to frequency in the range 3-36 kMc/sec. Above the phase transition at 112\ifmmode^\circ\else\textdegree\fi{}K, the temperature dependen…