Materials Literature
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Emission at 7618 Å from O2(b 1Σg+) produced in the energy-transfer reaction O(1D)+O2→O2(b 1Σg+)+O(3P),whose rate coefficient is greater than 10−11 cm3/sec, was measured as a function of [O2] and [He]. The O(1D) was produced by photolysis of O2 at 1470 Å. The decrease of O2(b 1Σg+) when N2, CO, CO2, NO, and N2O were ad…
Equipment and techniques for acoustic cavitation w o ~k are desc ribed . . The tes t liquid and its eontainer form part of a se lf sustaining programmable oscIllator. EmphasIs IS laId on the treatme nt of the liquid necessa ry to yield re producible res ults after artificial nucl ea tion ,. especially b y ne utrons ,…
A transverse quadratic electro-optic effect has been observed in a wide range of niobate transparent glass—ceramic systems. The electro-optic constant has been determined as a function of composition, temperature, and wavelength. A semiquantitative measurement of the frequency response has also been made. It has been…
Splat and other rapid quenching techniques were applied to a systematic study of simple oxides, and four new pure oxide glasses were obtained (V 2 O 5 , TeO 2 , MoO 3 , and WO 2 ). The high‐temperature tetragonal form of WO 3 coexists with a metastable short‐range‐order‐only phase. The structure of a new metastable hi…
A low-energy electron diffraction (LEED) system has been used to study the energy spectra of Auger electrons from clean and alkali-covered Ge and Si surfaces. Auger bands characteristic of the substrates were observed for the clean surfaces and the deposition of submonolayer coverages of K and Cs introduced new bands…
It has been shown that isolated magnetic domains in thin platelets (≍2 mils thick) of orthoferrites can be manipulated to perform memory, logic, and transmission functions. The purpose of this paper is to discuss the properties of orthoferrites that make them suitable for magnetic device applications and consider magn…
Abstract Stress‐strain cycling of natural rubber to high strains produces greater softening than amorphous rubbers, but only if the force on the sample is relaxed below a certain value during the cycle. This phenomenon, attributed to crystallization shows why nonrelaxing tests give a longer fatigue life than relaxing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of tetraethylammonium bis[(3)-1,2-dicarbollyl]cuprate(II)Richard M. WingCite this: J. Am. Chem. Soc. 1967, 89, 22, 5599–5604Publication Date (Print):October 1, 1967Publication History Published online1 May 2002Published inissue 1 October 1967h…
The effective shear moduli, dislocation line energies, dislocation widths, and relative ease of gliding have been calculated for the (0001) [112̄0], (11̄00) [112̄0], (11̄01) [112̄0], (112̄2) [112̄3̄], and (hk.0) [0001] slip systems in each of the hexagonal close-packed metals Cd, Zn, Mg, Co, Zr, Ti, and Be by applying…
Simultaneous decomposition of yttrium and zirconium alkozides was used to obtain an almost ideal mixture of powders of high surface activity. From this powder a translucent body, “Zyttrite,” was made with a grain size of less than 1μ. The mixed oxide was consolidated into a stabilized body by firing at 1000°C for 30 m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHypersensitive transitions of six-, seven-, and eight-coordinate neodymium, holmium, and erbium chelatesDavid G. KarrakerCite this: Inorg. Chem. 1967, 6, 10, 1863–1868Publication Date (Print):October 1, 1967Publication History Published online1 May 2002Published inissue 1 Oc…
what effect altering the invasion rate had on the structure of the community. The third series of experiments was a comparison of the structure of diatom communities in structurally and chemically similar streams on the island of Dominica and in the United States. The temperature of the water in the two rivers was sim…
Synthese de resines epoxydes type glycidyl; synthese a partir d'olefines et chloroacetyls; Caracterisation de resines epoxydes non vulcanisees; Mecanisme de vulcanisation. Caracterisation d'agents de vulcanisation (amines aliphatiques primaires, aromatiques primaires, secondaires et tertiaires, amides et composes nitr…
Abstract The nature of cracks, produced in three cured polyester resins during exposure to water has been studied by the combined techniques of optical microscopy, scanning electron microscopy and electron probe X-ray microanalysis. There are many cracks totally enclosed within the resin and it is shown that these mus…
Evidence is presented in support of a postulate proposed by Hartke and Regensburger in 1965, that the absorption edge in amorphous selenium is dominated at room temperature by an exciton band. Measurements of the temperature shift of the absorption edge show that the temperature shift decreases rapidly as the absorpti…
Electron paramagnetic resonance has been observed for the systems (a) Mn(ClO4)2–Et4NClO4, (b) MnCl2–Et4NCl, and (c) MnBr2–(n-C4H9)4NBr in acetonitrile. EPR intensity measurements, linewidths of the hyperfine components, electrical conductance, and optical spectra have been used to characterize the species exhibiting t…
Infrared-absorption spectra of doped KBr crystals at temperatures of approximately 8°K were measured in the wavelength range 2 to 15 μ. From the absorption spectra of crystals doped with NO2− and NO3− ions, and with ions enriched in the isotopes 15N and 18O, frequencies of normal vibrations of six isotopic NO2− molecu…
The infrared spectra of crystalline hydrazine and hydrazine-d4 have been recorded from 33 to 400 cm−1. All spectral bands have been assigned to lattice vibrations according to whether they arose primarily from a translational motion or a librational mode. However, there is strong evidence that these two motions are co…
The 57Fe Mössbauer-effect spectra of a series of tetrahedrally coordinated Fe(II) compounds of general formula R2FeX4 have been measured over a wide temperature range. The absorption showed approximately a tenfold increase on cooling from 300° to 4.2°K, showing that the effective Debye temperature for the Fe(II) ion i…
A differential scanning calorimeter has been used to determine the latent heat of fusion of o-terphenyl, 4.40±0.07 kcal/mole, the entropy of fusion, 13.4±0.2 cal/mole·°K, and the specific heat of the liquid, glassy, and crystalline states from 220°K to the melting temperature, 328.7°K. The constants of the Adam—Gibbs…