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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…
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…
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.
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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…
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…
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…
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…
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…
This paper deals with various aspects of crystallization leading to oriented textures. In the first place it attempts to clarify the problem of melt-extruded polyethylene sheet, which leads to the more general problem of crystallization under stress. Lamellar crystal growth, normal to the stress direction nucleated al…
The long-range particles emitted during the spontaneous fission of $^{252}\mathrm{Cf}$ have been investigated, confirming the emission of $^{1}\mathrm{H}$, $^{2}\mathrm{H}$, $^{3}\mathrm{H}$, $^{3}\mathrm{He}$, $^{4}\mathrm{He}$, and $^{6}\mathrm{He}$. In addition it was found that $^{8}\mathrm{He}$, $^{6}\mathrm{Li}$…
A mass-spectrometric stirred-reactor technique was used to study the reaction of atomic oxygen with methane with low concentrations of molecular oxygen. An overall rate constant for oxygen-atom disappearance due to added methane was obtained for the temperature range 375 to 576°K. This rate constant was 4 × 10 14 exp…
The fluorescence and infrared absorption spectra of Sm3+ in single crystals of LaF3 have been observed and analyzed. Fluorescence was observed in the spectral range of 0.55 to 1.1 μm, and absorption in the region of 0.9 to 10 μm. The intermediate coupling free-ion energy levels of the 6FH multiplets have been calculat…
Ionization-efficiency measurements on species produced in the pyrolysis of B2H6 have led to A (B+), A (BH+), A (BH2+), A (BH3+), and A (B2H5+) from B2H6 and to A (B+), A (BH+), A (BH2+), and I (BH3) from BH3. These experimental results have permitted a rather complete development of the energetics of the BH3; B2H6 sys…
It is pointed out that the Raman spectrum of a color center gives significant information on the vibration spectrum associated with an electronic transition of the center itself. The formal theory of the first-order Raman scattering by substitutional defects in alkali halides is developed in detail. The coupling coeff…
An empirical rule for the type of luminescence (fluorescence only, fluorescence and phosphorescence, phosphorescence only) to be expected, which depends on the position of the respective ligands in the spectrochemical series, has been found for octahedral chromium (III) complexes. This correlation is discussed in term…