Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermogravimetric MeasurementsA. E. NewkirkCite this: Anal. Chem. 1960, 32, 12, 1558–1563Publication Date (Print):November 1, 1960Publication History Published online1 May 2002Published inissue 1 November 1960https://doi.org/10.1021/ac60168a006RIGHTS & PERMISSIONSArticle Vie…
Measurements have been made of the characteristic electron energy loss spectra of beryllium, antimony, bismuth, germanium, tin, cadmium, copper, platinum, lead and calcium using the reflection technique and with 750 eV and 1500 eV primary electrons. The spectra of each element were found to consist almost entirely of…
. The effects of thickness errors are: (1) A shift of the wavelength at which maximum reflectance occurs; and (2) a change in phase shift upon reflection. The magnitude of these effects, and also their dependence on various parameters, are determined. Statistical tolerances for layer thicknesses are computed for given…
Abstract Capacity measurements obtained with an a.c. bridge have been used to determine the thickness of non‐porous oxide films on iron and aluminium surfaces, and for showing the effect of both the solvent action of aqueous solutions and electrochemical processes on the thickness of these films. These measurements co…
An interpretation is given to specific corrosion results obtained in field and laboratory investigations. The complex mutual interaction of corrosion stimulating and inhibiting factors (pH, buffer capacity, CaCO3 deposition, and alkalinity) is treated.
The precipitation kinetics of a gold l·5%, by weight, cobalt alloy have been followed by measuring the sàturation magnetization of the precipitated cobalt and the results are compared with current theories. Marked differences were found between the ageing curves of air and water-quenched specimens. The remanent magnet…
Macromolecular chains in freely growing crystals very likely fold back at regular intervals in order to minimize the free energy density of the crystal. The surface energy contribution favors infinite thickness. The smearing out effect of interchain potential field, however, arising from the incoherent part of fluctua…
The thermomagnetic properties of the compound Cr 2 As and Cu 2 Sb were investigated together with the phase diagram of Cr–As system. From the results of thermal and thermomagnetic measurements for Cr 2 As and Cu 2 Sb it was found that they show antiferromagnetic behavior with the Néel point at 393°K and at 373°K respe…
Crystallographical properties of the chemically prepared powder samples of Ag 2 O and Cu 2 O were investigated by an X-ray diffractometer, in relation to their bonding characters. The lattice constant is 4.720±0.004A for Ag 2 O and 4.268±0.001A for Cu 2 O. The thermal expansion coefficient of the lattice is 1.9×10 -6…
ABSTRACT Age measurements on glauconite by the K-Ar and Rb-Sr methods show a consistent variation with geological age with moderately small scatter. The results appear to fall 10-20 per cent short of ages measured on micas associated with dated igneous rocks. K-Ar and Rb-Sr age values are closely concordant in the maj…
The behavior of a permanent gas bubble in a liquid with an oscillating pressure field is analyzed with a linearized theory. If the assumption is made that conditions within the bubble are uniform, the thermodynamic relations found are as expected; i.e., at low frequencies the bubble behaves isothermally and at high fr…
Abstract A set of definitions is proposed to describe uniquely the six types of orientation possible in semicrystalline polymeric films. Oriented polymer films were studied by a new x‐ray diffraction technique which permits rotation of a sample about a number of independent axes yielding orientation distributions of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Tritium Tracer for the Determination of Hydrogen in AluminumA. S. GillespieCite this: Anal. Chem. 1960, 32, 12, 1624–1626Publication Date (Print):November 1, 1960Publication History Published online1 May 2002Published inissue 1 November 1960https://pubs.acs.org/doi/10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Tetrahedral Complexes of Nickel(II)F. Albert Cotton and David M. L. GoodgameCite this: J. Am. Chem. Soc. 1960, 82, 22, 5771–5774Publication Date (Print):November 1, 1960Publication History Published online1 May 2002Published inissue 1 November 1960https://pubs.acs.org/do…
The ultimate properties of amorphous rubbers at temperatures above Tg are considered in terms of stress-strain curves to rupture measured at different strain rates and temperatures. The consideration indicates that a specimen held at a fixed elongation should break eventually, provided the elongation exceeds a critica…
Normal perovskite-type barium titanate may be converted to the hexagonal polymorph by firing in a hydrogen atmosphere at 1330°C, 130° lower than that previously reported for firing in air. With suitable additives such as MnCO 3 the conversion begins at temperatures as low as 1100°C. Conversion is inhibited by a number…
Evidence is presented indicating that polyethylene crystals grow in the form of hollow pyramids as well as lamellar crystals. Modes of packing the folded molecules consistent with the nonplanar structure are proposed. Observed electron diffraction patterns and dark-field micrographs are related to the pyramidal morpho…
Antiferromagnetic domains in NiO have been studied by neutron diffraction and optical observation of single crystals. There are two kinds of antiferromagnetic domain walls, T (twin) and S (spin-rotation). A T wall is produced by rotation of the antiferromagnetic pattern of magnetic moments and an S wall by rotation of…
The statistical theory of the dielectric relaxation of polar liquids is developed using the fluctuation-dissipation approach to linear dissipative phenomena, and an expression is derived relating the complex dielectric constant to a time-dependent microscopic correlation function. It is found that a finite number of m…
The equation of state and the collision rate for systems ranging in size from four to 500 particles are described. The dependence of the results on the number of particles is qualitatively discussed and in this way insight is gained as to what is required of more accurate analytical theories. By comparing the results…