Materials Literature
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Irradiation of halophosphate lamp phosphors by a low‐pressure mercury arc causes a loss in luminescent efficiency, changes in the absorption spectra, and thermoluminescence. The 1849Aå wavelength is primarily responsible for these changes, which are partially reversed by longer wavelength radiation or by heat. X‐radia…
G. D. Palkar, D. N. Sitharamarao and A. K. Dasgupta, Trans. Faraday Soc., 1963, 59, 2634 DOI: 10.1039/TF9635902634
Abstract not Available.
D. C. Nonhebel, J. Chem. Soc., 1963, 1216 DOI: 10.1039/JR9630001216
Abstract The seeds of Mallotus philippinensis (Lam.) Muell.‐Arg. were found to contain 4 cardenolides (A, B, C and D) after fermentation. Two new glycosides, C and D, were obtained in crystalline form and were shwon to be corotoxigenin‐rhamnoside and coroglaucigenin‐rhamnoside respectively. The minor constituents A an…
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Oxygen present in cuprous iodide greatly increases the electrical conductivity. Copper films were formed with differing oxygen contents by copper vapor condensation at various oxygen pressures. After iodination to the conductivity was found proportional to the 1/8.4 power of the oxygen pressure during condensation. Cu…
Abstract Preliminary observation is made of the absorption spectra of four alkali halides (LiF, NaCl, KCl, and KBr) at various intervals after bombardment, at room temperature, with a 2 microsecond pulse of 2 MeV electrons. The absorption is measured spectrographically using an underwater uranium spark light source wh…
Abstract The melting transitions of natural rubber, cis ‐polyisoprene, gutta‐percha, balata and synthetic trans ‐polyisoprene, and cis ‐polybutadiene have been examined by means of differential thermal analysis. Natural rubber melts over a wide range of temperature giving several transitions, the magniture and tempera…
<div class="htmlview paragraph">The inherent advantages of quiet operation, few moving parts, and compact and lightweight construction make thermoelectric generators desirable for powering certain specialized military equipment. Recent developments in thermoelectric materials, couple designs, and couple compartm…
R. Hodges, S. G. McGeachin and R. A. Raphael, J. Chem. Soc., 1963, 2515 DOI: 10.1039/JR9630002515
Abstract The problem of determining the orientation of a crystal from the directions of three nonparallel traces formed by the intersection of three octahedral planes with the surface of a suitably prepared specimen has been solved completely for the first time. A full analytical treatment is presented, and it is show…
The direct synthesis of bismuth trisulfide was investigated by differential thermal analysis. It is demonstrated that bismuth trisulfide forms exothermically at about 285°C and melts at 760° ± 5°C. The probable reasons for the previous detonations in the preparation of this compound are elucidated. The thermoelectric…
Tridymite was synthesized under various conditions with respect to starting materials and mineralizers in room pressures. Some of them, in its X-ray powder diffraction data, show the features of tridymite M and tridymite S, which were confirmed by Hill and Roy in sythetic tridymite under the hydrothermal condition, an…
The average amount of non-exchangeable potassium removed by H-resin and boiling 1 N HNO 3 from the clay in eleven Canadian soils was about twice that in the fine silt, about four times that in the medium silt, and about eleven times that in the coarse silt and sand. Continuous leaching with 0.01 N HCl also removed fou…
Data are presented on corrosion rates of 3–25% Mo‐Ni alloys in 10% at 25°, 70°C, and the boiling point. Data also include measurements of corrosion potentials, critical current densities for passivity, anodic polarization in the active potential region, and hydrogen overvoltage. Molybdenum‐nickel alloys, like other pa…
The apparent optical anisotropy of porous oxide films on anodized aluminum is shown to be due to variations in the inclination of the pores above different crystal orientations in the metal substrate. This variation is an additional factor which must now be included in the basic picture of the cellular structure of th…
T. R. Meadowcroft and F. D. Richardson, Trans. Faraday Soc., 1963, 59, 1564 DOI: 10.1039/TF9635901564
Magnesium is normally in either the passive or transpassive state in aqueous environments. If in the transpassive state, its corrosion rate can be decreased by lowering its potential into the passive region. When high‐purity magnesium is polarized in the negative direction to the region of its reversible potential, a…
Abstract It has been shown that a nonreinforcing solid such as titanium dioxide can radically alter the glass transition temperature of the model polymer, poly(vinyl chloride–vinyl acetate) copolymer after being mechanically incorporated within it. The T g values were either higher or lower than that of the original u…