Materials Literature
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The free-electron model of a conjugated molecule is extended to apply to a metal. When each conduction electron is allowed to move freely along the set of one-dimensional lines (i.e. bonds) joining adjacent atoms, a band-structure appears. This is shown to be almost identical with the shape predicted by the convention…
Spinels of the FeFe(2−x)CrxO4,0⩽x⩽2, system have been made by reduction of the corresponding sesquioxide solid solution at 1180°C, 1100°C and 950°C and the lattice parameters determined at room temperature. The solutions of approximately stoichiometric composition have lattice parameters which vary with x in a nonline…
Abstract The modification of the amorphous/crystalline ratio in polyethylene terephthalate by copolymerization with glycols or dibasic acids usually results in a lowering of the degree of crystallinity and of melting point, and impaired physical properties. A consideration of the molecular constitution of silk fibroin…
It was found that plastic deformation takes place in periclase above 1100°C., in rutile above 600°C., and in sapphire above 900°C. The mechanism is slip; in sapphire (0001) is the slip plane and [1120] is the slip directiog. All creep curves for sapphire in tension show the same qualitative features. Each consists of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of Chloroform. I. Products1aGeorge P. Semeluk and Richard B. BernsteinCite this: J. Am. Chem. Soc. 1954, 76, 14, 3793–3796Publication Date (Print):July 1, 1954Publication History Published online1 May 2002Published inissue 1 July 1954https://pubs.ac…
Abstract It has been shown previously that water becomes non‐corrosive to iron and steel after contact with certain metal soaps (Pb, Zn, Ba, Sr, Ca) of linseed‐oil fatty acids. Aqueous extracts of the lead and calcium soaps have now been analysed, mainly by chromatography. The extracts contained salts of formic acid,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Catalytic Decomposition of Carbon Monoxide on Large Metallic Single CrystalsVictor J. Kehrer Jr. and Henry Leidheiser Jr.Cite this: J. Phys. Chem. 1954, 58, 7, 550–555Publication Date (Print):July 1, 1954Publication History Published online1 May 2002Published inissue 1 J…
The ordered state in the gold-copper alloy of the atomic ratio 1 to 1 was investigated by electron: diffraction with well orientated thin films. Below 340°C the pattern corresponded with a tetragonal superlattice the c axis of which is distributed into three original cubic axes, while above 360°C sharp crosses appeare…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Rate Study of the Silanol Condensation Reaction at 25° in Alcoholic Solvents1W. T. GrubbCite this: J. Am. Chem. Soc. 1954, 76, 13, 3408–3414Publication Date (Print):July 1, 1954Publication History Published online1 May 2002Published inissue 1 July 1954https://pubs.acs.org/…
A study is made of the cascade process which describes the diffusion, energy loss, and multiplication of secondary electrons within a metal. The secondaries interact mainly with conduction electrons through a screened Coulomb potential. For low secondary energy (50 ev) the resultant scattering is nearly spherically sy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeats of Formation of Nickel and Cobalt Oxides (NiO and CoO) of Combustion CalorimetryB. J. Boyle, E. G. King, and K. C. ConwayCite this: J. Am. Chem. Soc. 1954, 76, 14, 3835–3837Publication Date (Print):July 1, 1954Publication History Published online1 May 2002Published ini…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Constitution of Gelatin. Separation and Estimation of Peptides in Partial HydrolysatesW. A. Schroeder, Lois M. Kay, Joann LeGette, Lewis Honnen, and F. Charlotte GreenCite this: J. Am. Chem. Soc. 1954, 76, 13, 3556–3564Publication Date (Print):July 1, 1954Publication His…
This paper concerns an empirical linear relationship between the melting temperature T1 and the second-order or glassy transition temperature T2 for partially crystalline polymers. Two lines can be drawn, one for symmetrical polymers, the other for unsymmetrical polymers, the latter being of lower slope. These familie…
Spherically symmetric optical instruments, and their desirability for microwaves, are discussed. Application of Hamiltonian optics in analyzing the rays in the Luneberg lens has led to formula of a new lens that has spherical symmetry and a focus near its center. A cylindrical version of this new lens has been designe…
A method is described for simultaneously measuring the diffusion coefficient, solubility, and permeability for a given gas in a single sample of solid material. The method utilizes solutions of the diffusion equation (for both plane and cylindrical geometry) which make it easily possible to calculate the diffusion par…
The rates of crystallization of five polymers, poly-(ethylene oxide), poly-(decamethylene adipate), and three poly-(N,N′-sebacoyl piperazine)'s differing in molecular weight, have been observed dilatometrically at various temperatures ranging from 5.5 to 24° below the respective melting points Tm. The crystallization…
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