Materials Literature
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The tracer diffusion of iron in 18−8 stainless steel has been measured over a wide temperature range by the surface activity decrease method, using radioactive Fe55. The results show that the lattice diffusion coefficients can be described by the equation D=0.58 exp(−67 100/RT) cm2 sec−1. The effect of variations in g…
The magnetic domain structure of polycrystalline grain-oriented 3¼% silicon steel has been investigated by the magnetic-powder-pattern technique and the orientation of individual grains determined by the etchpit optical-goniometer technique. A semiquantitative relationship has been found between the domain patterns an…
Abstract The spherulites are built of distinct fibrillar units and their fine‐structure presents two problems: the arrangement of these units and their internal structure. In the present paper the first has been treated in greater detail. Based on direct observations, and on earlier works on nonpolymeric spherulites,…
The decomposition of ethyl mercaptan to ethylene and hydrogen sulphide was studied at various temperatures, with and without a catalyst. Metal sulphides (copper, nickel, and cadmium) proved to be the most efficient catalysts for cracking ethyl mercaptan into unsaturated end products, the optimum temperature being 500–…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Spontaneous Transformation from Macrocrystalline to Microcrystalline Phases at Low Temperatures. The Heat Capacity of MgSO4·6H2O1W. P. Cox, E. W. Hornung, and W. F. GiauqueCite this: J. Am. Chem. Soc. 1955, 77, 15, 3935–3938Publication Date (Print):August 1, 1955Publicat…
An alloy of composition close to Mn3AlC was prepared by induction melting. In the as-cast state the alloy was feebly magnetic at room temperature and the magnetic property was retained after homogenization at 1000°c. This alloy was composed of a single phase possessing an ordered face centred cubic structure with latt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic Reductions by Sodium Aluminum HydrideA. E. Finholt, E. C. Jacobson, A. E. Ogard, and P. ThompsonCite this: J. Am. Chem. Soc. 1955, 77, 15, 4163Publication Date (Print):August 1, 1955Publication History Published online1 May 2002Published inissue 1 August 1955https://…
Angular distributions have been measured for the elastic scattering of 40-Mev alpha particles from Ta, Au, Pb, and Th in the angular range 21\ifmmode^\circ\else\textdegree\fi{} to 155\ifmmode^\circ\else\textdegree\fi{}. If the ratios of the measured cross sections to the Coulomb cross section are assumed equal to 1.0…
Abstract i) Densities, sorption of water vapor and infrared absorption spectra were measured on four kinds of PVA films, which were prepared from the same PVA powder specimen and subjected to different heattreatments. ii) It was found by the present investigation that the 1146 cm−1 (8.74μ) band is the so-called crysta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectra and Structures of Cobalt Carbonyls1R. A. Friedel, I. Wender, S. L. Shufler, and Heinz W. SternbergCite this: J. Am. Chem. Soc. 1955, 77, 15, 3951–3958Publication Date (Print):August 1, 1955Publication History Published online1 May 2002Published inissue 1 August 1955h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeroxides. II. Preparation, Characterization and Polarographic Behavior of Longchain Aliphatic Peracids2Winfred E. Parker, Constantine Ricciuti, C. L. Ogg, and Daniel SwernCite this: J. Am. Chem. Soc. 1955, 77, 15, 4037–4041Publication Date (Print):August 1, 1955Publication…
Summary: The cells of Navicula pelliculosa become invested in a gelatinous capsule when they cease to divide. This may occur when the culture medium becomes depleted of some necessary element, such as silicon, phosphorus, or nitrogen. A method for the extraction of the capsular fraction has been devised, which is base…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Diagram of the System KNbO3-KTaO3 by the Methods of Differential Thermal and Resistance AnalysisArnold Reisman, Sol Triebwasser, and Frederic HoltzbergCite this: J. Am. Chem. Soc. 1955, 77, 16, 4228–4230Publication Date (Print):August 1, 1955Publication History Publish…
Abstract The tensile strength of decamethylene dismethylazodicarboxylate vulcanizates of GR‐S, 50°C. polybutadiene, 5°C. polybutadiene, and natural rubber has been determined as a function of temperature and/or the degree of crosslinking. A theory of tensile strength of amorphous polymers which adequately describes th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPowder Diffraction Standards for Niobium Pentoxide and Tantalum PentoxideL. K. frevel and H. W. RinnCite this: Anal. Chem. 1955, 27, 8, 1329–1330Publication Date (Print):August 1, 1955Publication History Published online1 May 2002Published inissue 1 August 1955https://pubs.a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline Organosilsesquioxanes*Arthur J. Barry, William H. Daudt, Joseph J. Domicone, and John W. GilkeyCite this: J. Am. Chem. Soc. 1955, 77, 16, 4248–4252Publication Date (Print):August 1, 1955Publication History Published online1 May 2002Published inissue 1 August 1955…
The specific viscosity, and its dependence on velocity gradient, plays an important role in studies of the structure of macromolecules in dilute solution. A satisfactory theoretical interpretation of the non-Newtonian viscosity of solutions of ellipsoidal particles has been given by Kuhn and Kuhn, and also by Saito, w…
The problem of determining the time of relaxation due to scattering of electrons and holes by charged impurity donors and acceptors in semiconductors is reconsidered in an effort to derive formulae more exact and general than those due to Conwell, Weisskopf, and other authors.
A macroscopically homogeneous aggregate contains two materials A, B, with dielectric constants εA, εB, in volume ratio p: (1—p); what is the dielectric constant of the aggregate? By a method used by Yvon and others in molecular theory, this very old problem is formulated rigorously and solved in series form. One form…
The method, developed by Kuhn and Van Vleck, and later simplified and extended by Brooks, for calculating the cohesive energy of monovalent metals, is here further extended to include the effects of the deviation of the effective ion-core potential from pure hydrogenic form in the vicinity of the surface of the $s$-sp…