Materials Literature
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An electron-diffraction study of the oxide films formed by heating aluminium foil in air on metal grid supports has revealed the occurrence of a number of new phases arbitrarily designated the h,/~, v, ~ and ~' phases. Except for the h-phase, all these phases may be indexed in terms of hexagonal unit cells with a ~ 5…
Abstract The thermal conductivity of a type I diamond has been measured between 2° K and room temperature. Above 100° K the temperature variation of conductivity accords with Peierls’s theory of Umklapp processes. To account for the results at the lowest temperatures it is necessary to assume that some specular reflex…
Calciumaluminiumhydrid wird durch Umsetzung von Aluminiumchlorid und Calciumhydrid in Tetrahydrofuran dargestellt. Das aus der Losung gewonnene Festprodukt enthalt auch in trockenem Zustand noch 40—50% Tetrahydrofuran und ist in seinen Eigenschaften dem Lithiumaluminiumhydrid weitgehend ähnlich.
A quantitative technique has been developed in which a weighed sample of cotton fiber is swollen in sodium hydroxide, centrifuged to remove liquid from between the fibers, and re weighed to determine its percentage increase in weight, the latter quantity being designated here as the fiber's "alkali-centrifuge value."…
The infrared spectrum of single crystals of brucite [Mg(OH)2] has been examined under high resolving power between 2 and 3μ. It contains at least 16 bands most of which are shown to be OH stretching frequencies and which exhibit a variety of polarization properties. It follows that the unit cell of brucite must be muc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Stability Constants of Cadmium Chloride Complexes: Variation with Temperature and Ionic Strength1Cecil E. Vanderzee and Harold J. Dawson Jr.Cite this: J. Am. Chem. Soc. 1953, 75, 22, 5659–5663Publication Date (Print):November 1, 1953Publication History Published online1…
Abstract In this article a conception of the mechanism of crystallization is given, on the basis of which, it is suggested the origin of spherulites might be explained. A tentative explanation of several related phenomena is based on the new concept. Crystallites are conceived to be small collections of strongly orien…
The annealing of isolated interstitial-vacancy pairs presumably introduced by bombardment is considered theoretically with special attention paid to the diamond-type lattice. It is proposed that the annealing can be divided into three stages. First, those vacancy-interstitial pairs having a small initial separation wi…
On the assumption that the energy per unit length of a dislocation line is proportional to the square of the Burgers vector, the stability of dislocations in simple cubic, face-centred cubic, diamond, hexagonal close-packed, and body-centred cubic lattices is discussed. It is shown that in each of these lattices, ther…
An experimental investigation of the concentration field during crystallization is made using an improved modification of W. F. Berg's interference technique. Na2S2O3·5H2O is crystallized at 23°C; concentrations between 40 percent and 55 percent. Graphing the positions of the growing faces versus time indicates, in al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Samarium Metal and of Samarium Monoxide1F. H. Ellinger and W. H. ZachariasenCite this: J. Am. Chem. Soc. 1953, 75, 22, 5650–5652Publication Date (Print):November 1, 1953Publication History Published online1 May 2002Published inissue 1 November 1953ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRecent Work on Molecular Weight of CelluloseE. H. Immergut, B. G. Ranby, and H. F. MarkCite this: Ind. Eng. Chem. 1953, 45, 11, 2483–2490Publication Date (Print):November 1, 1953Publication History Published online1 May 2002Published inissue 1 November 1953https://pubs.acs.o…
Abstract A study was made of rates and activation energies of thermal degradation of poly meta ‐methylstyrene, poly‐alpha‐deuterostyrene, poly‐alpha‐methylstyrene, and hydrogenated polystyrene, in the styrene type of polymers; and of two methyl methacrylates and one methyl acrylate, in the acrylate type of polymers. T…
A method is described for the evaluation of sums of the inverse n th power of the distances from a point P to all points of a lattice. The sums are expressed in sums of Bessel functions or e-powers that converge rather rapidly and Riemann ζ functions. The procedure can be used for any position of P with respect to the…
The UO 2 –ZrO 2 phase equilibrium system contained no new compounds but was found to contain extensive solid solution. The UO 2 solid solution was cubic and extended up to 52 mole % ZrO 2 . Its lattice parameter varied from 5.46 to 5.32 a.u. with an increasing percentage of ZrO 2 . The zirconia solid solution when exa…
Ferroelectric lead metaniobate, Pb(NbO 3 ) 2 , is structurally distinct from the ABO 3 perovskite‐type ferroelectrics presently known. Dielectric and dilatometric data indicate a 570°C. Curie point. In ceramic form the material can be polarized to retain a piezoelectric constant of the same order of magnitude as that…
Journal of the Physical Society of Japan 76 (2007) 111002 (3 pages) From Yukawa's Pion to Spontaneous Symmetry Breaking Yoichiro Nambu Journal of the Physical Society of Japan 76 (2007) 111005 (9 pages) Theoretical Overview of Flavor Physics A. I. Sanda Progress of Theoretical Physics Vol. 11 No. 4 (1954) pp. 411-424…
Abstract The dissolution of mild steel by warm sulphuric acid with and without organic inhibiting additions has been studied by means of simultaneous measurements of corrosion rate and corrosion potential, and by the determination of true anodic and cathodic polarization curves in the neighbourhood of the natural corr…
Analysis shows that the initial curvature of the distribution curve is always smaller for a polydisperse system than for a monodisperse system than for a monodisperse system. From this information and a knowledge of the position of the asymptote, it appears that the curve for a polydisperse case lies below the curve f…
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