Materials Literature
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The relationships between the dislocation density, flow stress and stored energy in polycrystalline copper have been determined experimentally. The stored energy can be predicted from the observed density and distribution of dislocations. The flow stress–stored energy and flow stress–dislocation density relationships…
Abstract Several reactions which take place in clay minerals at elevated temperatures were investigated by D.T.A. and continuous high-temperature X-ray diffraction. The combination of these techniques was used to examine the energy changes and phase transformations that occur in kaolinite, halloysite, illite, and mont…
Thermoelectric properties of AgSbTe 2 –AgBiTe 2 , AgSbTe 2 –PbTe and –SnTe systems are studied. In these alloys and also in AgSbTe 2 , when prepared by the usual method of zone melting, the thermoelectric power and the electrical conductivity vary along the length of the bar and the mode of the variation strongly depe…
Monolayers of stearic and behenic acids were transferred to quartz slides by the Blodgett technique. Troughs of different depths were cut into these multilayers (substrata), and additional monolayers were superimposed. When cultured and fresh embryonic cells were grown on these substrata, the cells were entrapped with…
Abstract Calcium hydroxide was allowed to react with various clays, other silicates, and quartz at slightly elevated temperatures for several months. The reaction products were examined by X-ray diffraction, DTA, and electron microscopy, and were shown to be poorly-crystallized calcium silicate hydrates of the tobermo…
The structure and mechanism of formation of the tarnished layer formed on αj-brass when it is immersed in a copper sulphate–ammonium sulphate–ammonium hydroxide solution of pH 7·2 has been studied. The mode of formation of cracks in this layer when the brass is deformed has been investigated and the various shapes of…
The method of determining the viscosity of a glass by the viscous bending of a simple beam is experimentally compared with the fiber‐elongation technique. For a standard soda‐lime‐silica glass, beam‐bending viscosity data are found to agree well with fiber‐elongation measurements reported by the National Bureau of Sta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTINTERACTION BETWEEN AMMONIA AND THE EXPANDING LATTICES OF MONTMORILLONITE AND VERMICULITEM. M. Mortland, J. J. Fripiat, J. Chaussidon, and J. UytterhoevenCite this: J. Phys. Chem. 1963, 67, 2, 248–258Publication Date (Print):February 1, 1963Publication History Published onli…
A method of flash-heating small rods of graphite inside a superpressure cell has been developed. The heating energy was inserted in less than 7 msec from a bank of electrolytic capacitors. This quick heating and cooling allowed fusion and freezing of the graphite to occur without serious melting or reaction of the sur…
In discussing the existence of surface states of electrons in solids or the scattering at a plane of discontinuity, it is necessary to match the wave function at the boundary plane, taken as the plane x = 0, using an infinite set of solutions of the Schrödinger equation in the solid. The solutions must all have the sa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic Oxides of Molybdenum(V) and Tungsten(V) with the Ordered Perovskite StructureFrank K. Patterson, Carl W. Moeller, and Roland WardCite this: Inorg. Chem. 1963, 2, 1, 196–198Publication Date (Print):February 1, 1963Publication History Published online1 May 2002Publish…
The "M\"ossbauer" technique was used to measure the internal magnetic fields and isomer shifts of ${\mathrm{Fe}}^{57}$ atoms residing at various sites in the FeSi series. The relative abundances of the various sites present in a given alloy were obtained by measuring the relative intensities of the components in the r…
The temperature dependence of the elastic constants of two single crystals of chromium was investigated from 77 to 500\ifmmode^\circ\else\textdegree\fi{}K. A detailed study was made of the anomalies at the N\'eel temperature, 310\ifmmode^\circ\else\textdegree\fi{}K, and at the low-temperature transition at 120\ifmmode…
Static pressure apparatus has been developed which is capable of pressures up to 200 kbar and transient temperatures up to about 5000°K, using an electric flash-heating technique. At pressures above about 125 kbar and temperatures in the 3000°K range it is found that graphite spontaneously collapses completely to poly…
A complete set of elastic, piezoelectric, and dielectric constants is presented for the sulfides, selenides, and tellurides of zinc and cadmium. The piezoelectric constants for the hexagonal crystals in this group are markedly higher than for the cubic crystals. An elementary model theory applied to these data leads t…
Received 27 December 1962DOI:https://doi.org/10.1103/PhysRevLett.10.84©1963 American Physical Society
The stability of the shape of a spherical particle undergoing diffusion-controlled growth into an initially uniformly supersaturated matrix is studied by supposing an expansion, into spherical harmonics, of an infinitesimal deviation of the particle from sphericity and then calculating the time dependence of the coeff…
A new form of solid germanium, of greater density than ordinary cubic germanium, can be formed by compressing cubic germanium at pressures exceeding 120 kilobars and reducing the pressure back to that of the atmosphere. The crystal structure is tetragonal, with a equal to 5.93 angstroms and c, to 6.98; 12 atoms per un…
Hydroxylysine and hydroxyproline are absent in the calcified proteins of Mytilus. The organic matrices from the calcite layers have a consistently higher ratio of acidic to basic amino acids than the aragonitic shell units. The uncalcified shell units periostracum and outer ligament, have very few acidic residues, whi…
Abstract The main thermoluminescence glow curve, the a, B, y glow curve, of polyethylene irradiated by y-rays at 77 °K has been found to be greatly affected by molecular oxygen absorbed in the material before irradiation. The oxygen removes the B and y peaks almost entirely at low irradiation doses and adds another pe…