Materials Literature
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As a result of fast neutron bombardment, monoclinic ZrO2 is transformed into the cubic phase normally stable only above 1900°C. It is suggested that the unique temperature-structure behavior in the zirconia system lends itself to this transition in a manner whereby two possible mechanisms may be operative. Stresses ac…
From the polarization properties of the fluorescence spectrum of single crystals of europic ethylsulfate nonahydrate it was possible to determine the multipole character of transitions, the energies and quantum nature of the seven levels of the ground state multiplet of the europic ion, and the group character of the…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
An expression due to Hildebrand and Scott has been used to select silver as a possible extractant for plutonium from neutron-irradiated uranium. The distribution of plutonium between molten silver and molten neutron-irradiated uranium has been examined in small-scale experiments. The fraction of plutonium in the silve…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Of Decomposition Of Tricalcium Silicate Into β-Dicalcium Silicate And Calcium OxideStephen Brunauer, D. L. Kantro, and C. H. WeiseCite this: J. Phys. Chem. 1956, 60, 6, 771–774Publication Date (Print):June 1, 1956Publication History Published online1 May 2002Publish…
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…