B.S. 12:1947. Portland Cement (ordinary and rapid-hardening)
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CIX. Theory of barium titanate—Part II
Summary The phenomenological theory of barium titanate given in an earlier paper has been extended, and expressions obtained for the piezoelectric constants, elastic coefficients for constant field and dielectric constants for constant strain in terms of other physical constants of the material. Curves are drawn showi…
Friction of diamond, graphite, and carbon and the influence of surface films
Abstract This paper describes an experimental study of the frictional behaviour of diamond, graphite and of carbon which have been outgassed in vacuo. The removal of surface films which are normally present causes a large increase in the friction. The admission of a small amount of oxygen, water vapour or other contam…
Anomale Wertigkeiten
Abstract Durch präparative Arbeiten der letzten Jahrzehnte ist bei verschiedenen Elementen das Auftreten von Oxydationsstufen festgestellt worden, die man bisher nicht kannte oder zum mindesten nicht beachtet hatte. Es wird über die wichtigsten Ergebnisse für die Elemente Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ag, Alkali‐…
Ultrarotspektroskopie als analytisches Hilfsmittel
Abstract Nach einer Besprechung der apparativen und theoretischen Grundlagen der Ultrarotspektroskopie wird an Hand einiger Beispiele aus der organischen Chemie die Anwendungsmöglichkeit in der qualitativen und quantitativen Analyse erläutert.
The Magnetostriction of Single Crystals of Iron-Silicon Alloys
The spontaneous magnetostriction of iron-silicon alloys can be adequately described by two constants ${h}_{1}$ and ${h}_{2}$. For ordered alloys ${h}_{1}$ goes through zero at about 11 atomic percent silicon, ${h}_{2}$ at about 9 atomic percent silicon. In disordered alloys, in the composition range around 10 percent…
Penetration of magnetic fields into superconductors III. Measurements on thin films of tin, lead and indium
Abstract The magnetic moments of thin superconducting films of tin, lead and indium, obtained by evaporation of the metal in vacuo, have been measured by a ballistic method. Values of the penetration depth, λ0, at absolute zero, derived from them by extrapolation, are estimated as 5.0 ± 0.1 x 10-6 cm. for tin, 3.9 ± 0…
Thermal Analysis of the System PbBr2–PbO
A thermal analysis of the system PbBr2–PbO proved the existence of four compounds intermediate between PbBr2 and PbO, namely PbBr2·PbO, PbBr2·2PbO, PbBr2·3PbO, and PbBr2·7PbO. The compound PbBr2·PbO was unstable above 497°C whereas the others were stable at their melting points. Pure PbBr2·PbO·H2O (or Pb(OH)Br) was pr…
Dicyclohexylammonium Nitrite, A Volatile Inhibitor for Corrosion Preventive Packaging
Dicyclohexylammonium nitrite is a powerful inhibitor for corrosion of steel by fresh water. Since this nitrite salt is slightly volatile, it has commercial application in a new method for preventing corrosion of packaged steel articles by the moisture that enters or is present within a package. It functions by vaporiz…
Diffractions des rayons X par les structures en couches désordonnées. I
Refu le 9 fgvrier 1951
The Allotropic Transformation of Hafnium
The existence of an allotropic transformation in hafnium, suggested by Zwikker in 1926, has been confirmed. The transformation temperature is 1310±10°C. The high temperature beta-form is probably body-centered cubic.
Optical Properties of Selenium
Measurements have been made of the refractive index of amorphous selenium in the red and near infra-red spectral region. The absorption coefficient of amorphous selenium has been measured in the ultra-violet, visible and near infra-red spectral regions. The transmission coefficients of several single crystals of selen…
The Relationship Between the Structural Geometry of a Textile Fabric and Its Physical Properties
This paper examines the relationship of structural geometry to the abrasion-resistance of textile fabrics. It is pointed out that the durability of a fabric can be significantly altered by modifying its structural design, without change in the fiber used in its manufacture. Earlier textile studies and heretofore unpub…
Volumetric and Phase Behavior in the Ethane-Propene System
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVolumetric and Phase Behavior in the Ethane-Propene SystemR. A. McKay, H. H. Reamer, B. H. Sage, and W. N. LaceyCite this: Ind. Eng. Chem. 1951, 43, 9, 2112–2117Publication Date (Print):September 1, 1951Publication History Published online1 May 2002Published inissue 1 Septem…
Theory of Anisotropic Colloidal Solutions
The appearance of anisotropic phase in the unipolar coacervations of tobacco mosaic virus or bentonite solutions are explained theoretically, and the recent theory of Onsager is confirmed. As has been emphasized already by Langmuir, the repulsive forces between solute molecules and the force arising from thermal agita…
Reactions in the System TiO 2 –SiO 2 ; Revision of the Phase Diagram
Twenty‐five compositions in the binary system were reacted in the solid state at temperatures ranging from 1000° to 1670 °C. and examined by X‐ray and optical methods. Four compositions near the eutectic were melted to glasses and treated by the quench technique at a temperature of 1575°C. The data obtained indicate s…
Effect of Composition and Temperature on the Specific Heat of Glass
Published data on the effect of composition, temperature, crystallization, and thermal history on measured values of the specific heat of glass are reviewed. The Einstein‐Debye relationship between temperature and atomic heat of solids does not apply to vitreous materials. The actual type of function expressing variat…
Phase Transition in Lead Zirconate
Detailed investigations on the dielectric and the thermal properties of PbZrO 3 have been made and compared with those of ferroelectric BaTiO 3 . In contrast with barium titanate, volume change at the transition near 220°C has turned out to be expansion, being δV/V=2.7×10 -3 , and a large amount of anomalous specific…
The Mechanical Properties of Metals
A description is given of edge and screw dislocations in a close-packed cubic lattice, which leads up to an account of the theory of Frank and Read of the origin of slip bands. Consideration is then given to a crystalline grain containing Frank-Read sources; it is shown that one has to expect cross-slip and the format…
Spectra of the Metallo-derivatives of α,β,γ,δ-Tetraphenylporphine
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectra of the Metallo-derivatives of α,β,γ,δ-TetraphenylporphineG. D. Dorough, J. R. Miller, and Frank M. HuennekensCite this: J. Am. Chem. Soc. 1951, 73, 9, 4315–4320Publication Date (Print):September 1, 1951Publication History Published online1 May 2002Published inissue 1…