Materials Literature
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Abstract The sequestration of calcium by polyphosphates in the presence of oxalate as a precipitating agent is reported at 25 and 60C in the pH range of 5–12. Sequestration increased with temperature. The sensitivity of sequestration to pH changes decreased with increase in the chain length of the polyphosphates. Magn…
Ferromagnetic resonance has been observed in single crystals of anhydrous chromium tribromide using frequencies of 20 to 27 kMc. At 1.5°K a g value of 2.006 is found along with a uniaxial anisotropy, K=9.4×105 ergs/cm3. Linewidths as narrow as 3.5 oe have been observed at 1.5°K.
The anisotropy in the plane of the film of thin films of Ni evaporated on Mo-covered substrates and of oxidized Ni films has been measured as a function of field and temperature. At intermediate fields, 200–1200 oe, a large rotatable anisotropy is found, about an order of magnitude larger than the usual magnetic annea…
Abstract The effect of polymer density on the gas permeability of polyethylene film has been studied. The experimental data for permeability P are described by the equation P = K (1 — d ) n , where K is a constant characteristic of each gas and d is the sample density. This equation is similar to previous analytical d…
The oxygen parameter of CrO2, which has the rutile structure, has been determined to be u=0.301±0.004. Single-crystal measurements of cell constants over the temperature range −200° to +200°C show the unusual decrease in the c axis with increasing temperature in agreement with x-ray powder results reported by other wo…
Neutron diffraction has been performed on powder specimens of Mn2As and Mn2Sb0.7As0.3. Mn2As has the antiferromagnetic structure found in Mn1.9Cr0.1Sb below the exchange inversion temperature. The atomic moments are 3.7 and 3.5 Bohr magnetons for Mn(I) and Mn(II), respectively. The moments lie perpendicular to the tet…
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…