Materials Literature
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observed Se-C1 distance of 6.42 /~, with its standard deviation of 0.04 A, is probably significantly greater than 6.32 J~ and less than 6.48 A. The conclusion drawn, then, is that the Se-C1 and C4-C1 distances in p-chlorobenzeneseleninic acid are shorter than normal single covalent bonds, but not as short as the value…
Bismuth telluride has been investigated because of its promise as a material for thermo-electric applications. Attempts have been made to grow single crystals of the material by the Stockbarger method, by directional freezing in a horizontal boat, and by pulling from the melt. The first two methods were not found to b…
The total surface energies (or surface enthalpies) of calcium oxide and calcium hydroxide were determined by measuring the heats of solution in 2 N nitric acid of calcium oxide and calcium hydroxide having high and low specific surface areas, and by determining the surface areas by the B.E.T. method, using nitrogen as…
The thermal and X-ray analyses were carried out for iron-selenium system from 48.8 to 57.4 atomic percent of selenium, such range being previously reported to be ferrimagnetic.It was concluded from the experimental results that at room temperature the concentration range from 48.8 to 53.1% selenium is the two phase re…
Impure magnetites, containing an appropriate amount of aluminum or other elements with an average charge of about 3 (for example, titanium + magnesium, titanium + vacancies, etc.), may undergo a reversal in their direction of magnetization as a result of an ionic ordering process during and after cooling. Gorter has s…
The theory of the geometry of multi-ply yarns developed in this paper is based on the assumption that the individual filament in the ply has the form of a “doubly-wound” helix, i.e., of a helix wound about a helical axis. The analysis yields an expression for the length of filament in terms of the parameters defining…
Oxidation of manganolls sulphate by an associa,t,ion of two bacteria and by a newly-isolated strain of a Gorynebactc'rium sp. was studiod in an artificial medium containing 0-005 per eont. yeast extraot, 0·005 per COIlt. manganous sulphate, and various other ino['ganic salts.
The unrestricted Hartree-Fock method is based upon the use of a single-determinant total wave function in which orbitals of the same $n$, $l$, and ${m}_{l}$ values but different ${m}_{s}$ values are regarded as being independent. The differences which arise between such orbitals are discussed. It is shown, using the L…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation of Solvolysis Rates. III.1 t-Butyl Chloride in a Wide Range of Solvent Mixtures2Arnold H. Fainberg and S. WinsteinCite this: J. Am. Chem. Soc. 1956, 78, 12, 2770–2777Publication Date (Print):June 1, 1956Publication History Published online1 May 2002Published inis…
By measurement of the specific heat, temperature coefficient of expansion, Young's modulus and yield point in Cu3Au alloys, it has been established that this alloy undergoes a phase transition between 550° and 600°C and possibly another one near 850°C. The temperature of the 550–600°C transition decreases sharply as t…
Gadolinium orthoferrite, GdFeO3, in single-crystal form exhibits magnetization between temperatures of 78 and 295°K which consists of a field independent part σ0 and a field dependent part χH for fields above 6000 oersteds. The parasitic ferromagnetization σ0 amounts to about 1% of the σ(Fe) available and may be attri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNotes - Basic Zinc Double Salts of O,O-Diakyl Phosphorodithioic AcidsV. Wystrach, E. Hook, and G. L. ChristpoherCite this: J. Org. Chem. 1956, 21, 6, 705–707Publication Date (Print):June 1, 1956Publication History Published online4 March 2003Published inissue 1 June 1956http…
Phase equilibrium data, obtained by using the quenching technique, are presented for the system iron oxide‐A1 2 O 3 in air and at 1 atm. O 2 pressure in the temperature interval 1085° to 1725°C. Stability ranges of the various phases are delineated, and approximate compositions of crystalline and liquid phases are det…
Magnetic susceptibility measurements by the Faraday method have been made in the temperature range 4-550\ifmmode^\circ\else\textdegree\fi{}K for a series of iron-free nickelous oxide samples prepared by the heat-treatment of hydrous nickelous hydroxide in a current of nitrogen at temperatures of 250-1300\ifmmode^\circ…
Colloidal silica of 30, 20, 10, and 5% concentrations by weight have been used to produce small-angle scattering. The resulting scattering showed plateaus which varied in angular position with concentration in the very small angle portion and then showed an approximation to the single particle scattering in the larger…
Summary X-ray diffraction data on serpentine minerals are discussed. There arc three structural varieties of chrysotile: ortho-chrysotile, clino-chrysotile, and para-chrysotile. Methods are described for the estimation of the proportions of the first two of these in mixed specimens, and their distribution in nature is…
It is a feature of many atomic diffusion jump mechanisms that successive jumps of an atom are “correlated” in the sense that the direction of a jump is not completely at random but is influenced to some extent by the direction of the preceding jump or jumps. General formulae are derived for the diffusion coefficient w…
Robert L. Ehrmann, George O. Gey; The Growth of Cells on a Transparent Gel of Reconstituted Rat-Tail Collagen2, JNCI: Journal of the National Cancer Instit
The crystal structure of gadolinium orthoferrite, GdFeO3, has been determined from single-crystal x-ray data. There are four GdFeO3 distorted perovskite units in the orthorhombic cell with lattice constants a=5.346, b=5.616, c=7.668, all ±0.004 A. The structure is solved on the basis that the most probable space group…
Pyroelectric currents produced by light flashes have been observed and measured in single crystals of guanidine aluminum sulfate hexahydrate from room temperature down to -180\ifmmode^\circ\else\textdegree\fi{}C. At room temperature the currents are about one-tenth of those produced in equivalent barium titanate cryst…