Materials Literature
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Measurements of the characteristic electron energy loss spectra of aluminum and magnesium were made (in a reflection experiment) during oxidation of a fresh evaporated layer of either metal. It was found that surface oxidation results in the rapid disappearance of the low-lying energy losses (10.3 ev in aluminum and 7…
The observations reported here of the electron spin resonance in quite perfect single crystals of graphite clearly establish that the resonance arises from mobile charge carriers. The line shape is of the Dysonian form which is characteristic of conduction electron spin resonance in metals. The intensity of the spin r…
Abstract The structural configurations that distinguish the atactic phase from the isotactic phase give rise to infrared spectra characteristic of each phase. Since these differences are quite significant, a method is proposed with which the isotacticity can be determined. The relation between the isotactic phase and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on Metastable States of Porphyrins. II. Spectra and Decay Kinetics of Tetraphenylporphine, Zinc Tetraphenylporphine and Bacteriochlorophyll1Lauri Pekkarinen and Henry LinschitzCite this: J. Am. Chem. Soc. 1960, 82, 10, 2407–2411Publication Date (Print):May 1, 1960Pub…
Piezoelectricity and ferromagnetism have been found to occur simultaneously in the compound Ga(2−x)FexO3. Single crystals of approximately equimolar gallium to iron ratio have been grown from a flux consisting of Bi2O3 and B2O3. X-ray diffraction data on ceramic compositions have shown that the galliumto iron ratio ca…
The six elastic constants (and six elastic compliances) of corundum were determined in the kilocycle per second frequency range by an accurate resonance method. The results were checked in the megacycle per second range with a less accurate, pulse velocity method. The elastic moduli for polycrystalline alumina calcula…
An experimental study has been made of photovoltaic effects which occur at semiconductor-electrolyte interfaces. Single crystal specimens of CdS and several other compounds were used. It was found that in a number of cases the photovoltaic effect results from a chemical reaction of the electrode materials. In such cas…
During an investigation of the Mn-Al system from 40–100% Mn, a new metastable phase was found,which has a tetragonal structure with lattice constants a = 2.77 A and c = 3.57 A and lattice positions 000 and 121212 with a preference of the Mn atoms for one of these positions. This τ phase, which has the approximate comp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlumina: Catalyst and Support. I. Alumina, its Intrinsic Acidity and Catalytic Activity1Herman Pines and Werner O. HaagCite this: J. Am. Chem. Soc. 1960, 82, 10, 2471–2483Publication Date (Print):May 1, 1960Publication History Published online1 May 2002Published inissue 1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHYDROTHERMAL SYNTHESIS OF ZINC OXIDE AND ZINC SULFIDE1R. A. Laudise and A. A. BallmanCite this: J. Phys. Chem. 1960, 64, 5, 688–691Publication Date (Print):May 1, 1960Publication History Published online1 May 2002Published inissue 1 May 1960https://pubs.acs.org/doi/10.1021/j…
The crystal distortion which arises from the Jahn-Teller effect is discussed in several examples. In the case of compounds containing Cu2+ or Mn3+ at octahedral sites, the lowest orbital level of these ions is doubly degenerate in the undistorted structure, and there is no spin-orbit coupling in this level. It is show…
Distribution and densities of dislocations, determined by electron transmission microscopy, flow stress and stored energy measurements (by microcalorimetry) on cold-worked polycrystalline silver are correlated with each other, The dislocations are arranged in dense networks forming the boundaries of an otherwise relat…
The diffusion coefficients of the constituent ions were measured in CsBr and CsI single crystals between 300\ifmmode^\circ\else\textdegree\fi{}C and 550\ifmmode^\circ\else\textdegree\fi{}C by means of radioactive tracers and were compared with electrical conductivity measurements. Approximate satisfaction of the Nerns…
An x-ray study was made of aluminum--copper--lithium alloys aged at 165 deg C, and also of the effect on aging of additions of 0.1 wt.% cadntium snd of prior cold work. The main precipitates at 185 deg C are theta ', theta ', Ti, and delta '. theta ' and theta ' occur in binary aluminum--copper alloys. It is a termany…
Abstract The chain conformation of the isotactic polymer of m ‐methylstyrene is discussed in this paper. As it was possible to foresee, the chain has a helicoidal shape, but, contrary to other chains of isotactic polymers, it contains 11 monomeric units in 3 pitches. Owing to the structural complexity which does not a…
The motion of floating fibres in roller and apron drafting has been investigated using an apparatus which permits the direct observation of marked fibres as they pass through the drafting zone at reduced speed. A description of the apparatus is given together with a summary of the results. The experiments show that at…
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Abstract The Mayo and Lewis reactivity ratio concept was found to be applicable to the treatment of the data obtained from base‐catalyzed copolymerization studies involving eight cyclic siloxane monomers. The cyclics investigated were hexamethylcyclotrisiloxane, hexaphenylcyclotrisiloxane, and all six members of the s…
This study of the analysis of polarization curves is based on the identification of the partial currents of the single electrochemical reactions involved. The relationship between the gradient of polarization curves and the corrosion rate in uninhibited corrosion processes is investigated. The analysis of polarization…
Viscosity and electric conductivity measurements have been made on liquid beryllium fluoride over the temperature range 700–950°C. The high specific resistance and viscosity and the magnitude of the corresponding energies of activation indicate that the classical random network structure for glasses is applicable. Liq…