Materials Literature
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In Part I the subjective evaluation of stiffness is used as a standard with which to compare the results obtained from five laboratory methods of measuring stiffness. Measurements were made on a range of nineteen fabrics of varying fiber content, weave, and weight. The results indicated significant correlation in four…
It will be pointed out that the anisotropy energy is of primary importance in the theory of antiferromagnetism. The formula for the susceptibility χ= (χ∥ + 2χ⊥)/3, which follows in van Vleck's theory from a rather arbitrary assumption that the parallel and perpendicular domains are distributed with a ratio 1:2, can on…
An investigation of the diffusion of ions in several glasses was made using radioactive tracer techniques. The resulting diffusion curves were analyzed to obtain the thermodynamic properties of the diffusion process. These properties are indicative of energy and structure changes in the glass networks. Interpretations…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmmonia Decomposition and Related Phenomena on Rhenium Catalysts1James Peter McGeer and Hugh S. TaylorCite this: J. Am. Chem. Soc. 1951, 73, 6, 2743–2751Publication Date (Print):June 1, 1951Publication History Published online1 May 2002Published inissue 1 June 1951https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of Molecular Weight on the Properties of PolystyreneE. J. Merz, L. E. Nielsen, and Rolf BuchdahlCite this: Ind. Eng. Chem. 1951, 43, 6, 1396–1401Publication Date (Print):June 1, 1951Publication History Published online1 May 2002Published inissue 1 June 1951https://…
The following paper deals with evidence of ferroelectricity in KNb${\mathrm{O}}_{3}$ and NaNb${\mathrm{O}}_{3}$. Temperatures at which both materials undergo crystallographic changes and corresponding changes in dielectric constant and loss tangent are reported. Photographs of dielectric hysteresis loops and values of…
Abstract The theory of propagation of longitudinal waves of plastic deformation is extended to apply to materials in which the stress is a function of the instantaneous plastic strain and strain rate. Solutions are given for an idealized flow law and compared with solutions based upon earlier theories which neglect st…
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Summary The principal difficulty in developing a dislocation theory of mechanical twinning has been to explain how a twin grows through a finite thickness of crystal. By extending the recent theory of slip bands, proposed by Frank and Read, it is possible to show that a dislocation can move steadily from plane to plan…
An antiferroelectric state is defined as one in which lines of ions in the crystal are spontaneously polarized, but with neighboring lines polarized in antiparallel directions. In simple cubic lattices the antiferroelectric state is likely to be more stable than the ferroelectric state. The dielectric constant above a…
In this experiment the gyromagnetic ratio of a sample of very pure iron was determined. The sample was wound with a magnetizing coil and supported as a torsional pendulum in an evacuated space almost completely free of residual magnetic fields. Changes in pendulum amplitude were brought about by repeated and synchroni…
In the vicinity of an edge type dislocation, the density of electrons, and therefore the width of the filled portion of the conduction band is not uniform. To keep the electrons in equilibrium, an electrostatic potential is required. The scattering caused by this potential is used to calculate the increased resistance…
Among the problems introduced by swept wings is that of the non‐rectangular panel in equilibrium under loading applied tangentially along its edges. The present article examines the state of stress in a general uniform quadrilateral panel and, for the benefit of stiffness calculations, the strain energy stored in it.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of Dioxolane1William B. Guenther and W. D. WaltersCite this: J. Am. Chem. Soc. 1951, 73, 5, 2127–2131Publication Date (Print):May 1, 1951Publication History Published online1 May 2002Published inissue 1 May 1951https://pubs.acs.org/doi/10.1021/ja011…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions between Alkali Superoxides and Some Alkaline Earth Nitrates in Liquid AmmoniaEdgar Seyb Jr. and Jacob KleinbergCite this: J. Am. Chem. Soc. 1951, 73, 5, 2308–2309Publication Date (Print):May 1, 1951Publication History Published online1 May 2002Published inissue 1 M…
By an extension of a recent analysis of the problem of grain boundary diffusion in metals, the expression has been derived relating the diffusion coefficients D′ and D for grain boundary and for volume diffusion, δ the effective “ width ” of the grain boundary and α the angle at time t between a line of constant conce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Kinetics of the Thermal Decomposition of Nitric Acid VaporHarold S. Johnston, Louise Foering, Yu-Sheng Tao, and G. H. MesserlyCite this: J. Am. Chem. Soc. 1951, 73, 5, 2319–2321Publication Date (Print):May 1, 1951Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Preliminary Study of the Kinetics of Pyrolysis of Diborane1Richard P. Clarke and Robert N. PeaseCite this: J. Am. Chem. Soc. 1951, 73, 5, 2132–2134Publication Date (Print):May 1, 1951Publication History Published online1 May 2002Published inissue 1 May 1951https://pubs.acs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of Pyrolysis of Diborane1John K. Bragg, Lewis V. McCarty, and F. J. NortonCite this: J. Am. Chem. Soc. 1951, 73, 5, 2134–2140Publication Date (Print):May 1, 1951Publication History Published online1 May 2002Published inissue 1 May 1951https://pubs.acs.org/doi/10.102…
The infrared spectra of many strongly-absorbing solids and liquids can be measured directly only with difficulties, involving preparation of very thin sections, or mulling the substance with diluents, etc. In such cases, the measurement of reflection offers an advantage. If the measurements are performed at two differ…