Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE PHOTOREDUCTION OF PORPHYRINS AND THE OXIDATION OF AMINES BY PHOTO-EXCITED DYESD. MauzerallCite this: J. Am. Chem. Soc. 1960, 82, 7, 1832–1833Publication Date (Print):April 1, 1960Publication History Published online1 May 2002Published inissue 1 April 1960https://pubs.acs…
Electron magnetic resonance studies of x-ray damaged crystals of potassium perchlorate indicate the presence of two types of stable paramagnetic defects at room temperature. One type of defect appears to be a trapped ClO/sub 2/ molecule. Findings are described. (C.H).
The diatomic and linear triatomic molecules such as the oxides and halides of the ``iron-group'' elements are of importance in high temperature systems. Although the various high symmetry compounds of these elements, e.g., the solid oxides, hydrated complexes, etc., are sufficiently understood in terms of the present…
Abstract Apparent activation energies for heterogeneous acid hydrolysis of four samples of cellulose which differed in crystallinity were calculated separately for the amorphous and crystalline regions, from data obtained under drastic hydrolytic conditions. Some approximate activation energies were also calculated fo…
The class of materials B2O3–H2O has been investigated over the range B2O3 to B2O3·3H2O. This includes ``dry'' glassy B2O3, ``wet'' glassy boron oxide of approximate composition B2O3·½H2O, monoclinic and orthorhombic forms of metaboric acid, B2O3·H2O, and triclinic orthoboric acid, B2O3·3H2O. The nuclear quadrupole int…
Data are given that graphically demonstrate space‐charge build‐up in a glass containing alkali and in a glass relatively free of alkali. The observed potential distributions show a decided asymmetry and have large potential drops near the electrodes with a linear potential change near the center of the sample. The obs…
The attenuation of the plane shock wave produced in a solid by a flying plate of the same material is treated neglecting dissipative processes and effects of material rigidity. Explicit formulas for the position of the shock front and the shape of the pulse as functions of time are obtained by application of Friedrich…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly Strained Cyclic Paraffin-SiloxanesWilliam A. Piccoli, Gerald G. Haberland, and Robert L. MerkerCite this: J. Am. Chem. Soc. 1960, 82, 8, 1883–1885Publication Date (Print):April 1, 1960Publication History Published online1 May 2002Published inissue 1 April 1960https://…
Experiments have been performed in which observations have been made in the presence of dc electric field bias of: (1) hysteresis loops, (2) double loops above the Curie point, (3) Kerr electro-optic effect above the Curie point and (4) capacitance above the Curie point in BaTi${\mathrm{O}}_{3}$. The purpose of these…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeresters. V.1 Di-t-butylperoxyoxalatePaul D. Bartlett, Erhard P. Benzing, and Richard E. PincockCite this: J. Am. Chem. Soc. 1960, 82, 7, 1762–1768Publication Date (Print):April 1, 1960Publication History Published online1 May 2002Published inissue 1 April 1960https://pubs.…