Materials Literature
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The positions of the oxygen ions of tetragonal Mn 3 O 4 are determined through the Debey-Scherrer X-ray analysis, by the extension of the Bertaut's method and with least square method. The assigned correction for the anomalous scattering on Mn to Fe–Kα radiation is somewhat larger than the calculated value. The two ox…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHEAT CAPACITIES AND CHEMICAL THERMODYNAMICS OF CERIUM(III) FLUORIDE AND OF CERIUM(IV) OXIDE FROM 5 TO 300°K.1Edgar F. Westrum Jr. and Alvin F. Beale Jr.Cite this: J. Phys. Chem. 1961, 65, 2, 353–355Publication Date (Print):February 1, 1961Publication History Published online…
Abstract Vermiculite occurrences can be divided into two major categories, those having macro-scopic and those having microscopic or clay vermiculite. This paper is concerned with the former. The macroscopic type of vermiculite deposits can be subdivided into four categories based on the host rock: (1) ultramafic and…
Abstract Complexes have been formed by mixing urea or thiourea with high molecular weight yoly(ethylene oxide) on a hot roll mill and by precipitation of the complex from benzene solution. The most dramatic method of complex formation, however, is observed when finely divided urea or thiourea is suspended in a benzene…
In this part, two alternative methods for measuring shear properties of fabrics are described. One method is recording and consistsof an attachment to the Instron Tensile Tester. Complete load-deformation curves are obtained. The stress distribution in a fabric sample subjected to shear is analyzed and the results use…
Creep of vacuum annealed polycrystalline 65/36 alpha-brass was studied at constant stress in the range 77–30°k, close to the yield point, at elongations not exceeding 3%. The tensile strain σ increased logarithmically with time, and the characteristic strain 8cr ≡ de/d log10 t, given by the slope of the creep curves i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal Carbonyls. I. Carbon Monoxide Exchange with Nickel Tetracarbonyl and Dicobalt Octacarbonyl1,2Fred Basolo and Andrew WojcickiCite this: J. Am. Chem. Soc. 1961, 83, 3, 520–525Publication Date (Print):February 1, 1961Publication History Published online1 May 2002Published…
The anomalous resistivity‐temperature characteristics found in semiconducting barium titanates were studied in relation to their composition. The resistivity and impedance characteristics and the crystal structures were investigated for different compositions in the systems (Ba, ‐Sr) (Ti, Sn)O 3 , (Ba, Ca, Sr)TiO 3 )…
A possible mechanism for the development of etch pits at dislocations in copper by etching in solution is presented, and experiments are described which may substantiate this mechanism. Etchants which will develop pits at clean dislocations on the (111), (100), and (110) faces of copper are described. These etchants a…
Abstract Various workers have studied the mechanism of swelling of Na-montmorillonite and have demonstrated that its ability to swell is due to water penetrating between the individual silicate sheets. In the present study intraerystalline swelling was followed by diffraction techniques which enabled the movement of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Amine Complexes of Aluminum Hydride. IIJohn K. Ruff and M. Frederick HawthorneCite this: J. Am. Chem. Soc. 1961, 83, 3, 535–538Publication Date (Print):February 1, 1961Publication History Published online1 May 2002Published inissue 1 February 1961https://pubs.acs.org/doi…
For a system of $N$ identical particles in a pure bound state, the density matrices of positive orders $p$ and $N\ensuremath{-}p$ have the same nonzero eigenvalues with the same multiplicities. If the number of nonzero eigenvalues is finite, these density matrices are unitarily equivalent.
An empirical viscosity vs concentration relation for concentrated polymer solutions is derived in terms of a simple free volume theory, and its applicability is tested with some available data for amorphous polymer+solvent systems. It is found that the derived relation fits well those data over the range of polymer co…
The three elastic moduli of 99.999+% pure copper and their associated internal frictions have been measured at Mc frequencies between 4.2 and 250°K both before and after fast neutron bombardment. The changes produced by the irradiation were used to determine the dislocation contributions to the damping and moduli as a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRefractory Metals. Tantalum, Niobium, Molybdenum, Rhenium, and TungstenClifford HampelCite this: Ind. Eng. Chem. 1961, 53, 2, 90–96Publication Date (Print):February 1, 1961Publication History Published online1 May 2002Published inissue 1 February 1961https://pubs.acs.org/doi…
An analysis is made for optimizing the thermal efficiency of a sandwiched thermoelectric device and is coded for a digital computer. For suitable input data, the computer determines the thermocouple design that approximately maximizes the thermal efficiency of the device. A verification of the analysis indicates that…
Abstract The clay mineral attapulgite derives its non-swelling needle-like morphology from its three-dimensional crystal structure. The shape and size of the needles result in unique colloidal properties, especially resistance to high concentrations of electrolytes, and give high surface area, high porosity particles…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Reactions of Potassium Silyl1M. A. Ring and D. M. RitterCite this: J. Am. Chem. Soc. 1961, 83, 4, 802–805Publication Date (Print):February 1, 1961Publication History Published online1 May 2002Published inissue 1 February 1961https://doi.org/10.1021/ja01465a01…
Glass fibers as commercially produced have physical and mechanical properties which differ from those of the massive form of the same glass. When these fibers are subjected to subsequent heat‐treatments, the values of the measured properties tend to return to those of the massive glass. This phenomenon is called compa…
The phase equilibrium diagram for the system La 2 O 3 ‐B 2 O 3 has been determined experimentally. The compounds La 2 O 3 ‐3B 2 O 3 and La 2 O 3 ‐B 2 O 3 melt congruently at 1141°± 5°C. and 1660°± 15°C, respectively. At 1488°± 5°C, La 2 O 3 ‐B 2 O 3 inverts from the aragonite‐type structure to a high‐temperature form.…