Materials Literature
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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…
A consideration of recently published results on the transmission of longitudinal waves in cylinders of liquid, in hollow tubes and in solid rods shows that the first two cases give velocity-frequency curves which are quite similar to each other but different from that obtained with the third case. The reason for thes…
Temperature-volume measurements were made from -85 to +85 G on rubber hydrocarbon and 3 soft rubber-sulphur compounds, using dilatometers of a low thermal expansion glass with alcohol, acetone, water, and mercury as confining liquids.
Abstract According to the Weiss theory a ferromagnetic body is composed of a number of “domains” each magnetized even in the absence of an external field to an intensity dependent on the temperature. At absolute zero this spontaneous magnetization (σ0) is equal to the saturation intensity (σ∞) whilst at any other temp…
X-ray diffraction patterns of carbon black have been made with strictly monochromatic radiation. Without making any assumptions as to the crystallinity of the material, the distribution of atoms about any one atom has been determined directly from the experimental scattering curve by the method of Fourier integral ana…
As a result of a new mathematical analysis of the action of the double crystal spectrometer, a method of using the instrument has been found which makes it possible to determine the spectral energy distribution of an x-ray line and to calibrate the instrument without any previous knowledge of the diffraction patterns…
A method for the direct determination of the components of interatomic distances in crystals has been developed from a consideration of the properties of the Fourier series whose coefficients are the squares of the $F$-coefficients for the crystal reflections. Valuable structural information is thus obtained without m…