Materials Literature
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Abstract The postdepositional transformation of montmorillonite and/or mixed-layer illite-montmorillonite to illite is suggested as a source of silica cement in some sedimentary rocks. Depth of burial appears to be an important factor in effecting this change, and although supporting data are lacking, the changes in m…
99.999% copper crystals were deformed in tension using an Instron tensile tester, and the dislocation density and arrangement in the crystals were determined before, during, and after the deformations using an etch pit technique. For crystals of low initial dislocation density, it was found that a large amount of disl…
Abstract Alkali acrylates and methacrylates were irradiated with gamma rays from a Co 60 source at −78°C. and their subsequent polymerization was studied in vacuo in the temperature range 0 to 155°C. Potassium acrylate proved to be the most rapidly polymerizing solid monomer studied to date; it reacted at 0°C. faster…
Abstract Various methods are reviewed whereby Teflon and other polyfluorocarbon resins can be surface treated in order to enhance their bondability with ordinary adhesives. The features of these methods are compared and some conclusions are drawn as to their relative usefulness. Particular emphasis is placed on the so…
Abstract An investigation of the morphology of crystallization of fractionated linear polyethylene has shown that single crystal platelets may be obtained from dilute xylene solutions only in a limited region of temperature. The variation of this temperature region with molecular weight is greater than would be expect…
Three structures are briefly reported: FeRh is antiferromagnetic at low temperatures and ferromagnetic above 60°C. Fe has in both region a high moment of about 3μB; Rh has a definite moment in the ferromagnetic region of about 0.6μB. Cr3Se4, a nonstoichiometric compound with ordered holes, has a magnetic structure clo…
In the frame of a given crystallographic symmetry a matrix ζ(k) is constructed, the eigenvectors and eigenvalues of which are directly related to the spin configuration and magnetic exchange energy, respectively. For Bravais lattices the matrix equation reduces to Villain's equation. When chemical and magnetic unit ce…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTThermal Stability of Organic CompoundsI. B. Johns, E. A. McElhill, and J. O. SmithCite this: Ind. Eng. Chem. Prod. Res. Dev. 1962, 1, 1, 2–6Publication Date (Print):March 1, 1962Publication History Published online1 May 2002Published inissue 1 March 1962https://pubs.acs.org/doi/…
On the basis of infrared data it is concluded that the O–H–O bond in HCrO2 (chromous acid) is symmetric, whereas the O–D–O bond in DCrO2 is asymmetric.
General kinetic models are established for the climb of edge and screw dislocations. The climb of a straight unconstrained edge dislocation is considered in terms of the diffusion of nonequilibrium point defects to (or from) the line and their absorption (emission) and destruction (creation) at the line. The climb is…
Allophane has been known to occur widely in volcanic ash soils in Japan and New Zealand. However, exact knowledge of its nature has not been well established, mainly because of extreme difficulty to separate it in pure state and of its x-amorphous nature. In the course of the studies on soil allophane, it was noticed…
Spin-ordered materials may exhibit a magnetic polarization which is proportional to an applied electric field and an electric polarization which is proportional to an applied magnetic field. In this paper a comprehensive discussion is given of the present knowledge of these magnetoelectric (ME) effects. The specific t…
Observations on low temperature mechanical twinning in Cu and Cu-Zn alloys are reported. The absence of indications of twinning on the stress-strain curves of crystals of 70:30 α-brass is discussed in relation to recent preliminary electron microscopy observations. The twinning data are consistent with the existence o…
Investigations on the effect of ionizing radiations on proteins have mainly been concerned with soluble proteins. Irradiation of these, either in solution or in the dry state, leads to aggregation and decreased solubility, and at the same time to fragmentation of the protein molecule (1-4). Little detailed information…
Abstract Systematic measurements of the thermal conductivity of plastics have been undertaken by various methods and checked against each other. Between −180 and +100°C. the thermal conductivity depends only slightly on the temperature. For instance, amorphous plastics and natural rubber show a break in the curve at t…
Abstract The equilibrium sorption isotherms of water in polyethylene terephthalate, ethyl cellulose, and rubber hydrochloride have been measured at 25°C. by means of the quartz helix technique. The permeability constants and the diffusion constants have been measured on the same polymers and on polyethylene and polypr…
Two effects of atmosphere on the sintering of alumina powder compacts were investigated. Changing the oxidizing conditions during early‐stage sintering measurements showed that, within the range −70°F dew point oxygen to −70°F hydrogen equilibrated with alumina, there was no observable effect on sintering rate. The ef…
Abstract The steady state diffusion of gases through capillaries or through the pores of a solid when the total pressure in the system is constant is considered. It is shown that the ratio of the molar diffusion rate of the lighter gas to that of the heavier gas must be equal to the square root of the ratio of the mol…
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