Materials Literature
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The heat capacity of a large natural crystal of magnetite was measured between 1.8 and 4.2\ifmmode^\circ\else\textdegree\fi{}K. The specific heat, as a function of temperature, is resolved into two parts: a ${T}^{3}$ term that presumably is the lattice heat, and a ${T}^{\frac{3}{2}}$ term that may be identified as a s…
Neutron powder diffraction patterns have been obtained for zinc ferrite over the temperature range 2.7\ifmmode^\circ\else\textdegree\fi{}K-300\ifmmode^\circ\else\textdegree\fi{}K. The data strongly suggest that the compound undergoes a transition from a paramagnetic state to an antiferromagnetic state in the neighborh…
Although the theories of thermionic and field emission of electrons from metals are very well understood, the two types of emission have usually been studied separately by first specifying the range of temperature and field and then constructing the appropriate expression for the current. In this paper the emission is…
Abstract The thermochemical data of part I, the heats of formation and solution of the alkali-metal (group 1a ) azides, are used in conjunction with other data to derive values for the lattice energies of alkali-metal azides, the heat of formation of the azide radical, for the electron affinity and hydration heat of t…
Abstract The softening of elastomers on cold milling results from scission of the polymer molecules by the applied shearing forces. The ruptured chains are free radicals, which can undergo mutual combination, interaction with oxygen and various additives, and branching (grafting) on to other polymer molecules. A gener…
Martin K. Barnett, Frank C. Mead, Jr., A 24 Factorial Experiment in Four Blocks of Eight: A Study in Radioactive Decontamination, Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 5, No. 2 (Jun., 1956), pp. 122-131
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of Thermal Decomposition of Liquid Nitric AcidC. W. Tait, J. A. Happe, R. W. Sprague, and H. F. CordesCite this: J. Am. Chem. Soc. 1956, 78, 12, 2670–2673Publication Date (Print):June 1, 1956Publication History Published online1 May 2002Published inissue 1 June 1956…
Glass compositions containing antimony oxide as a glassformer were developed. The stabilizing oxides used in these compositions were A1 2 O 3 , Na 2 O, and K 2 O. Glasses formed from these oxides, containing antimony oxide in amounts up to 78% by weight, transmitted infrared radiation in wave lengths up to 6.2 μ. The…
The first result are presented of a theoretical investigation of the tensions to be expected during the unwinding of yarn from a cylindrical package. A full treatment of the problem, including a discussion of packages of other shapes, will be presented at a later date.
Glasses of the composition of grossularite and similar glasses poorer in silica were treated hyd rothermally, a nd t he composition of t he resulting hydrogarn ets was estimated from t he uni t cell size as ca lculat ed from X -ray powder pat terns. The silica content of t he hy drogarnets in creased con t inuously wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Physical Chemistry Of Simple Molten GlassesJ. D. MackenzieCite this: Chem. Rev. 1956, 56, 3, 455–470Publication Date (Print):June 1, 1956Publication History Published online1 May 2002Published inissue 1 June 1956https://pubs.acs.org/doi/10.1021/cr50009a002https://doi.org…
Fast neutron bombardment of artificial graphite increases the longitudinal elastic modulus and electrical resistivity and decreases the thermal conductivity. Annealing at temperatures higher than the bombardment temperature reverses the neutron-induced property changes, but complete recovery does not occur until annea…
As a result of fast neutron bombardment, monoclinic ZrO2 is transformed into the cubic phase normally stable only above 1900°C. It is suggested that the unique temperature-structure behavior in the zirconia system lends itself to this transition in a manner whereby two possible mechanisms may be operative. Stresses ac…
From the polarization properties of the fluorescence spectrum of single crystals of europic ethylsulfate nonahydrate it was possible to determine the multipole character of transitions, the energies and quantum nature of the seven levels of the ground state multiplet of the europic ion, and the group character of the…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
An expression due to Hildebrand and Scott has been used to select silver as a possible extractant for plutonium from neutron-irradiated uranium. The distribution of plutonium between molten silver and molten neutron-irradiated uranium has been examined in small-scale experiments. The fraction of plutonium in the silve…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Of Decomposition Of Tricalcium Silicate Into β-Dicalcium Silicate And Calcium OxideStephen Brunauer, D. L. Kantro, and C. H. WeiseCite this: J. Phys. Chem. 1956, 60, 6, 771–774Publication Date (Print):June 1, 1956Publication History Published online1 May 2002Publish…
observed Se-C1 distance of 6.42 /~, with its standard deviation of 0.04 A, is probably significantly greater than 6.32 J~ and less than 6.48 A. The conclusion drawn, then, is that the Se-C1 and C4-C1 distances in p-chlorobenzeneseleninic acid are shorter than normal single covalent bonds, but not as short as the value…
Bismuth telluride has been investigated because of its promise as a material for thermo-electric applications. Attempts have been made to grow single crystals of the material by the Stockbarger method, by directional freezing in a horizontal boat, and by pulling from the melt. The first two methods were not found to b…
The total surface energies (or surface enthalpies) of calcium oxide and calcium hydroxide were determined by measuring the heats of solution in 2 N nitric acid of calcium oxide and calcium hydroxide having high and low specific surface areas, and by determining the surface areas by the B.E.T. method, using nitrogen as…