Oxidation and sublimation of graphite in simulated re-entry environments.
Graphite thermochemical response tested in simulated environment for use as thermal shield for hypersonic reentry vehicles
Materials Literature
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Crystal and Magnetic Structure of PbCrO3
PbCrO3 has been synthesized in the high-pressure ``belt'' apparatus from PbO and CrO2 at 1150°C and a pressure in excess of 50 kbar. Single-crystal and powder x-ray diffraction at room temperature show the compound has the cubic perovskite structure with a0=4.00 Å. No deformation of the cubic structure was discerned i…
Photochromic Anils. Mechanisms and Products of Photoreactions and Thermal Reactions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic Anils. Mechanisms and Products of Photoreactions and Thermal ReactionsRalph S. Becker and W. Frank. RicheyCite this: J. Am. Chem. Soc. 1967, 89, 6, 1298–1302Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published inissue 1 M…
Mechanism of Peroxide Vulcanization of Elastomers
Abstract As is now well known, the use of an organic peroxide as a crosslinking agent for an elastomer was first reported by Ostromislensky in 1915. In this work benzoyl peroxide was used to cure natural rubber; similar acyl peroxides together with more recently discovered, less active, and more convenient dialkyl per…
Phase Equilibrium in the System PbO‐TiO 2 –ZrO 2
Phase equilibrium relations in the system PbO–TiO 2 –ZrO 2 were studied by quenching in the range where the PbO content is 50 mole % and more. Isotherms were examined at 1100°, 1200°, and 1300°C and tie lines were determined between the liquid and solid solution in equilibrium. The incongruent melting point of PbZrO 3…
Homogeneous Catalysis. IV. Some Reactions of Silicon Hydrides in the Presence of Cobalt Carbonyls
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous Catalysis. IV. Some Reactions of Silicon Hydrides in the Presence of Cobalt CarbonylsA. J. Chalk and J. F. HarrodCite this: J. Am. Chem. Soc. 1967, 89, 7, 1640–1647Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published iniss…
The Infared Spectra of Metalloporphyrins (4000-160 Cm-1)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Infared Spectra of Metalloporphyrins (4000-160 Cm-1)L. J. Boucher and J. J. KatzCite this: J. Am. Chem. Soc. 1967, 89, 6, 1340–1345Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published inissue 1 March 1967https://pubs.acs.org/doi/1…
Giant Negative Magnetoresistance in Ferromagnetic Eu1− x Gd x Se
The NaCl-type compounds Eu1−xGdxSe form a continuous series of solid solutions between the ferromagnetic insulator EuSe and the antiferromagnetic metal GdSe. We have studied the temperature dependence of electrical resistivity ρ, in Eu1−xGdxSe single crystals and polycrystals between 2.5° and 300°K; we find, in qualit…
Theory of Low-Energy Electron Diffraction
A method for calculating the intensities of diffracted waves in low energy electron diffraction by crystals is proposed. The elastic multiple scattering is fully taken into account. The cellular method of KOHN and ROSTOKER in the band theory of metals is applied to the integral equation of the scattering by two dimens…
Solid Solution of Boron in Graphite
The solubility of boron in graphite was determined in the temperature interval of 1800° to 2500°C. The maximum solubility was 2.35 at. % at 2350°C; the solution was shown to be substitutional.
Remarks on the calculation of the potential composition of hydraulic cements
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The curing of mixtures of sand, lime and flying ashes, at various temperatures
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Bibliography
Determination of chlorine in concretes by X ray fluorescence methods
Not available
Proportioning of Portland cement raws by means of the lime modulus
Not available
Kinetics and Mechanism of Bacterial Disinfection by Chlorine Dioxide
Survival data are presented for a fecal strain of Escherichia coli exposed to three concentrations of chlorine dioxide at four temperatures. Chick's first-order reaction equation is generalized to a pseudo nth-order model. Nonlinear least squares curve-fitting of the survival data to the nth order model was performed…
Structural Characterization of Sulfur-Vulcanized Rubber Networks
Abstract Studies of the chemistry of vulcanization today occupy a central position in current efforts to achieve better product performance from available natural and synthetic rubbers. They provide technologists with increasingly realistic pictures of the molecular make-up of vulcanizates from which relations between…
Bond Lengths in the α-Ga2O3 Structure and the High-Pressure Phase of Ga2−xFexO3
The crystal structure of α-Ga2O3, which is isostructural with α-corundum, has been refined from single-crystal x-ray diffraction data. The bond lengths have been determined to an accuracy of about 0.01 Å. The bond lengths in the GaO6 octahedron are 2.077 and 1.921 Å. The short Ga–O distance corresponds to the oxygens…
A Family of New Cobalt-Base Permanent Magnet Materials
The magnetocrystalline anisotropy of several intermetallic phases of the type RCo5 (R = Y, Ce, Pr, Sm, Y-rich and Ce-rich mischmetals) has been investigated, and it is concluded that these alloys are promising candidates for fine-particle permanent magnets. They have extremely high uniaxial anisotropy (K = 5.4 to 7.7…
Introduction to Nuclear Reactor Theory
Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation John R. Lamarsh, George I. Bell; Introduction to Nuclear Reactor Theory. Physics Today 1 March 1967; 20 (3): 110–111. https://doi.org/10.1063/1.3034192 Download citation file: Ris (Zotero) Reference Manager E…