Materials Literature
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The effects of variations of the thickness of the individual layers of an interference filter made with dielectric multilayers are examined, with respect both to the displacement of the pass band and to its width as affected by random fluctuations in these thicknesses. It is shown that the use of special multilayer st…
Summary A hydrated barium-strontium pyrochlore with only subordinate amounts of Ca and Na has been found in a weathered biotite rock (contact-rock of a carbonatite) from Panda Hill, Tanganyika, as small euhedral yellowish-grey cubic crystals (showing the combination of the octahedron and the cube) in a rock containing…
Seven plane gratings of high quality having ruled widths of more than 10 in. have now been produced on the M.I.T. servo controlled ruling engine, monitored with interference fringes. Resolving powers closely approaching the theoretical 900 000 in the 12th order green, and above 1 200 000 in the 26th order of 2537 A, h…
The t riclinic m odification of M gzBz0 5 wa s classifi ed as a m ember of a n isostr uct ural seri es which also includes MnzBz0 5, F ezBz0 5, and C02Bz0 5 Th e cr ystal st ru cture was re fi ned by the use of successive Fourier projectio ns and a least-squares refi nement program on a n electroni c compu ter. The st…
Abstract High molecular weight polyoxymethylenes are not soluble at room temperature in any of the hundreds of solvents or solvent systems tested. However, solutions can be obtained at elevated temperatures with a wide variety of solvents. Phenolic compounds are the most effective at temperatures of 50–100°C. At the o…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePreparation and Properties of the Systems LanFexCr1−xO3 and LaFexCo1−xO3Aaron Wold and William CroftCite this: J. Phys. Chem. 1959, 63, 3, 447–448Publication Date (Print):March 1, 1959Publication History Published online1 May 2002Published inissue 1 March 1959https://pubs.acs.or…
Abstract Die Geschwindigkeit der Wasserstoffentwicklung bei der Umsetzung von NaBH 4 mit H 2 O zeigt, daß das erste Wasserstoffatom des BH rascher reagiert als die übrigen drei. Der Schluß, daß sich ein primäres Reaktionsprodukt Na[H 3 BOH] bildet, konnte infrarotspektroskopisch bestätigt werden. Die weitere Hydrolyse…
Europium oxide of 99.7% purity was compacted into small bars and pellets which were fired at temperatures from 1050° to 1700°C. for 2 to 120 hours in atmospheres that were oxidizing, mildly reducing (open furnace), or strongly reducing. It was found that (1) europium oxide compacts fired in oxygen for 2 hours at 1500°…
Abstract Vapor pressures were measured for the system, poly(vinyl alcohol)‐water at 30°C. with the apparatus reported in the preceding paper. Fractionated samples were used in the form of thin films, carefully dried under high vacuum at room temperature. The degree of crystallinity of these samples was about 0.2, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Reaction of Styrene with Ethyl Thioglycolate; Evidence for the Termolecular Thermal Initiation of Styrene PolymerizationRichard R. Hiatt and Paul D. BartlettCite this: J. Am. Chem. Soc. 1959, 81, 5, 1149–1154Publication Date (Print):March 1, 1959Publication Histo…
Larger-than-band-gap photovoltages have been observed in both cubic and hexagonal crystals of ZnS with stacking faults. Under monochromatic excitation the photovoltage measured parallel to the $c$ axis shows two sign reversals at about 3300 A and 3500 A and peaks at approximately 3250 A and 3400 A. The position of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsomerization of Some α-Hydroxysilanes to Silyl Ethers. II1A. G. Brook, C. M. Warner, and Mary E. McGriskinCite this: J. Am. Chem. Soc. 1959, 81, 4, 981–983Publication Date (Print):March 1, 1959Publication History Published online1 May 2002Published inissue 1 March 1959https…
Abstract The kinetics of the thermal decomposition of the polyester, Laminac 4116, were investigated in air and argon at atmospheric pressure by means of a continuous recording thermobalance and by differential thermal analysis. Samples were heated from ambient temperature to 600°C. at rates of 5°/min. and 15°/min. In…
Abstract A method for obtaining the intrinsic dielectric constant and loss factor of dry cellulose fiber along the fiber axis was developed, and the dielectric properties of viscose rayon, Bemberg (cuprammonium rayon), and cotton sliver were measured over the frequency range from 500 cycles/sec. to 3 Mcycles/sec. and…
In order to determine whether ferromagnetic or antiferromagnetic exchange coupling would result from alloying the rare earth metals with cobalt or iron, a number of melts were made containing these elements. The data on saturation magnetization with composition and on saturation magnetization with temperature obtained…
A theory for the molecular motion in liquids is formulated. It treats the system as a series of molecular shells bound elastically to each other and to a central molecule. The vibrations of this system are analyzed approximately in an effort to find the probability that the central molecule will be left in a hole larg…
An evaporation technique has been developed to allow thin (approx. 200 Å thick) detached single crystal films of gold to be prepared. These films are very coherent and uniform in thickness. Dislocation lines are observed in these films with a density of 1010-1011/cm2 The dielocations may be observed to move inside the…
Elastic and charge-exchange cross sections have been measured in the energy range 4 to 400 ev for Ne+ in A, A+ in Ne, and A+ in A. Charge exchange was observed only for A+ in A. No evidence was found for the existence of the diatomic ion NeA+. Constants for empirical potential functions have been evaluated and the fun…
Abstract Stable, high molecular‐weight polyoxymethylene resins show the room temperature x‐ray crystalline patterns expected from early work on unstable or low molecular weight polyoxymethylene resins. High‐temperature studies show the specific features of this resin to be: (1) disappearance of crystalline peaks at 18…
Abstract Poly(vinyl chloride), polymerized with the use of γ‐radiation, benzoyl peroxide, and 2,2′‐azobis(isobutyroitrile) as initiators, was thermally decomposed in vacuo. The gaseous decomposition products as analyzed by mass spectrometry consist primarily of hydrogen chloride for decomposition temperatures below ap…