Materials Literature
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ABSTRACT A method has been developed for analyzing the X‐ray diffraction patterns of amorphous solids, and the atomic arrangement in two simple glasses has been completely worked out. In SO 2 , for example, each silicon is tetra‐hedrally surrounded by 4 oxygens at a distance 1.60 AIR, and each oxygen is shared between…
Abstract The subject of joint-formation, about which there has been much speculation and conflicting hypothesis, involves two main problems: (1) He question whether the characteristic shape of the articular surfaces is due to extrinsic or intrinsic factors. (2)The question how two opposing bone rudiments developing fr…
The thermal and electrical conductivities of two specimens of Bi single crystals were determined as a function of temperature and orientation of magnetic field relative to their crystallographic axes. These effects were observed at temperatures ranging from -170\ifmmode^\circ\else\textdegree\fi{}C to -50\ifmmode^\circ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupersaturation and Crystal Formation in Seeded SolutionsHsü Huai. Ting and Warren L. McCabeCite this: Ind. Eng. Chem. 1934, 26, 11, 1201–1207Publication Date (Print):November 1, 1934Publication History Published online1 May 2002Published inissue 1 November 1934https://pubs.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE ISOLATION OF 0.1 GRAM OF THE OXIDE OF ELEMENT 91 (PROTACTINIUM)A. V. Grosse and M. S. AgrussCite this: J. Am. Chem. Soc. 1934, 56, 10, 2200Publication Date (Print):October 1, 1934Publication History Published online1 May 2002Published inissue 1 October 1934https://pubs.a…
Abstract Hitherto it has generally been assumed that the catalytic hydrogenation of ethylene linkages in organic compounds at surfaces such as nickel or platinum involves merely the direct addition of a molecule of hydrogen across the double bond. In view of the fact that chemi-adsorbed hydrogen on catalytically activ…
Article Covalent Radii of Atoms and Interatomic Distances in Crystals containing Electron-Pair Bonds was published on October 1, 1934 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 87, issue 1-6).
The cross-sections for the emission of radiation by very fast electrons (energy great compared with mc 2 ) and for the production of pairs of positive and negative electrons by very hard γ-rays is calculated, considering the screening of the atomic field in which the processes happen. The main part of the paper deals…
Abstract Despite their frequent appearance in the laboratory, few of the structures of hydrated salts have as yet been found. This may be due to the large numbers of parameters usually involved, which, in the absence of any general laws concerning water of crystallization, makes the analysis very difficult. It was tho…
A perturbation theory is developed for treating a system of $n$ electrons in which the Hartree-Fock solution appears as the zero-order approximation. It is shown by this development that the first order correction for the energy and the charge density of the system is zero. The expression for the second-order correcti…
The dielectric constant of Rochelle salt crystals perpendicular to the $a$ axis at 0\ifmmode^\circ\else\textdegree\fi{}C was measured over the frequency range of 30 to 30\ifmmode\times\else\texttimes\fi{}${10}^{6}$ cycles/sec. Following a fairly uniform decline from 62,000 at 30 cycles to 220 at ${10}^{7}$ cycles, the…
The solubilities of biphenyl, between 30° and 60°, in benzene, carbon disulphide, carbon tetrachloride, heptane, dioxane and p-dichlorobenzene have been determined. The solubilities, in all cases, are lower than ideal. The freezing point-composition diagram for the system biphenyl-p-dichlorobenzene has been determined…
1. The crystal structure of dysanalyte has been verified. 2. The crystal structure of CsNO3 has been determined. 3. The so-called perovskite structure as a type of cubic symmetry is based on a mineral which is very probably not cubic but is orthorhombic. 4. The term ``perovskite structure'' should be discontinued.
Accurate measurements of the thermoelectric power of nickel and two alloys of nickel with 1 and 2 per cent. of chromium have shown that these alloys show only 30 per cent. and 10 per cent. respecti...
The fluorescence front fibres dyed with strongly fluorescent direct dyes is examined for polarization, and the result interpreted in terms of the micellar orientation and spiral structure of the fibres. Results on a number of natural and artificial cellulose fibres are given and discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Rate of Oxidation of Graphite by SteamMartin A. MayersCite this: J. Am. Chem. Soc. 1934, 56, 9, 1879–1881Publication Date (Print):September 1, 1934Publication History Published online1 May 2002Published inissue 1 September 1934https://pubs.acs.org/doi/10.1021/ja01324a015…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization under High PressureHoward W. StarkweatherCite this: J. Am. Chem. Soc. 1934, 56, 9, 1870–1874Publication Date (Print):September 1, 1934Publication History Published online1 May 2002Published inissue 1 September 1934https://pubs.acs.org/doi/10.1021/ja01324a013ht…
A method is developed for the harmonic analysis of x-ray powder patterns. From the experimental scattering curve one obtains directly a radial distribution function giving the number of atoms to be found at any distance from a given atom. As an illustration, the method is applied to the pattern of rhombic sulphur. A r…
Abstract Mair and Todd (J. Chem. Soc., 1932,, 386), in extending the earlier work of Robertson and Mair (J. Soc. Chem. Ind., 46, 41T (1927)), studied the interaction of a chloroform solution of purified rubber with concentrated hydrogen peroxide (100 vols.) dissolved in glacial acetic acid; by this means they obtained…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic Reagents1 in Qualitative Analysis. II. The Analysis of the Common Metals of the Ammonium Sulfide GroupLeo Lehrman, Harold Weisberg, and Elvin A. KabatCite this: J. Am. Chem. Soc. 1934, 56, 9, 1836–1838Publication Date (Print):September 1, 1934Publication History Publ…