Materials Literature
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Oxygen ion mobility in the cubic fluorite‐structure phase having the composition Zr 0.85 Ca 0.15 O 1.85 has been directly determined by exchange measurements employing the stable isotope O 18 and mass spectrometer analysis. Measurements of electrical conductivity have been carried out as a function of both temperature…
The formula given by Moli\`ere for the scattering cross section of a charged particle by an atom, on which has been based the formula for the "screening angle" ${\ensuremath{\chi}}_{\ensuremath{\alpha}}$ in his theory of multiple scattering, has been examined and found to contain an inconsistent approximation in all o…
Thin sheets, removed by cleavage from the surface layers of mica exposed to fission fragments from uranium, have been examined in transmission in the electron microscope. Fission fragment tracks which are less than 300 A. in diameter and greater than four microns in length have been seen, superimposed upon a general b…
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An empirical equation form, approximating the apparent dependence of the strength of brittle polycrystalline specimens on the combined effect of porosity and grain size, has been developed from concepts and data in the literature. The form is shown to be applicable to data for thoria and chromium carbide specimens.
The total photoelectric cross sections of copper, molybdenum, silver, tantalum, and gold have been measured at 662 kev. A highly collimated beam of gammas from a Cs-137 source impinged upon a thin disk of a target material. Photoelectrons from a target were detected by a plastic scintillator subtending very nearly $4\…
Ferroelectric ${(\mathrm{glycine})}_{3}$\ifmmode\cdot\else\textperiodcentered\fi{}${\mathrm{H}}_{2}$S${\mathrm{O}}_{4}$ crystallizes at room temperature in the monoclinic system with $a={9.41}_{7}$ A, $b={12.64}_{3}$ A, $c={5.73}_{5}$ A, $\ensuremath{\beta}=110\ifmmode^\circ\else\textdegree\fi{}{23}^{\ensuremath{'}}$;…
Montmorillonite, illite, chlorite, and kaolinite in the playas of southern California are traceable directly to the source areas surrounding the basins. No evidence found in this investigation suggests that these clay minerals are unstable in the sodic or calcic saline lake environment, but this conclusion may not be…
Proto-enstatite, at room temperature, is orthorhombie with 8 units of MgSiO3 in a cell of dimensions a ----9.25, b ----8.74, c = 5.32 A, pseudo space group Pbcn. The atomic coordinates of the pseudo space group were determined from X-ray powder data. The SiO3 chain is fully extended. One of the Mg atoms has an irregul…
A new modification of boron, resulting from the pyrolytic decomposition of BI z on a heated surface (800 C. to 1100 C.), has been found to have a simple rhombohedral structure, with a 0 = 5.057 /~ and c~ = 58.06 , space group R3m, Z ----12. The atomic parameters have been obtained from a single crystal using the prece…
The structure was determined and refined by use of Pa t te rson and Fourier projections on the three faces of the uni t cell. The seven shortest Zr-O separations in the coordination polyhedron around each zirconium range from 2.04 to 2.26 A; since the next nearest Zr-O separat ion is 3.77 ~ , the coordination number o…
Abstract The influence of zinc oxide and stearic acid on the structures of vulcanizates was traced in stocks with mercaptobenzothiazole by means of the kinetics of swelling. It was found that zinc oxide in the presence of stearic acid has a marked influence on the rate and degree of crosslinked network formation in vu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of Hydrazine Hydrate and Phenylhydrazine with MalononitrileTADASHI SATOCite this: J. Org. Chem. 1959, 24, 7, 963–966Publication Date (Print):July 1, 1959Publication History Published online1 May 2002Published inissue 1 July 1959https://pubs.acs.org/doi/10.1021/jo010…
Abstract The thermal‐oxidative degradation of films of poly(ethyl acrylate) about 35 μ thick were studied in the temperature range of 80 to 120°C. The degradation was followed by determining intrinsic viscosity changes, absorption of oxygen, and production of titratable acidity in the polymer. From viscosity results a…
Results of measurements of retraction as a function of twist are given for yarns produced by continuous twisting processes, as opposed to the twisting of a fixed length. These are compared with Tattersall's2 earlier work and also with the predictions of Treloar's1 theory. When continuous twisting methods are used, the…