Materials Literature
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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…
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Abstract Es wird über elektrische Untersuchungen an „zusatzfreien”︁ Zinndioxydschichten mit spezifischen Leitfähigkeiten zwischen 10 −1 bis etwa 3 · 10 2 Ω −1 bzw. mit Elektronenkonzentrationen zwischen 10 18 bis 2 · 10 20 cm −3 berichtet. Die Schichten wurden nach dem Gaszersetzungsverfahren hergestellt. Bei Zimmerte…
The Rydberg potential has been applied to a number of body-centered and face-centered cubic metals. The parameters of the potential were calculated using the experimental values for the energy of vaporization, the lattice constant, and the compressibility. Results have been obtained for the elastic constants, for the…
SummaryTin coatings electrodeposited direct on brass have an initial trace zinc content which makes them liable to tarnish in atmospheres containing sulphur dioxide. When more zinc reaches the surface by diffusion from the substrate, susceptibility to corrosive agents increases. Undercoats of copper or nickel are effe…
Abstract In this work a detailed X-ray powder diffraction study of the reversible temperature transformation has been undertaken in several rare earth niobates MNbO 4 M being lanthanum, cerium, neodymium, gadolinium, holmium, thulium, ytterbium, and yttrium. Both high-temperature diffractometer and film techniques wer…
Abstract Bei der Polykondensation des Maleinsäureanhydrids bzw. der Malein‐ oder Fumarsäure mit Äthylenglykol wurde dessen Anlagerung an die Doppelbindung des ungesättigten Dicarbonsäurebausteins und die Bildung von 1‐(2‐Hydroxyäthoxy)‐äthan‐1,2‐dicarbonsäure bzw. deren Ester nachgewiesen. Die Anlagerung ist nicht nur…
The intensity of emission of Eu 3+ is shown to vary with its electrostatic binding energy in the tungstates which have the scheelite structure. Increasing the polarization of the oxygens toward Eu 3+ or Tb 3+ appears to decrease the total binding energies of these ions in the tungstates and molybdates. Brightness can…
Interest in titanium-base alloys as structural materials has inspired many studies of their phase relationships. These have provided the background essential to the development of commercial alloys, but have also revealed some unexpected, and still to some extent unexplained, aspects that are of considerable scientifi…
G. Williams, Trans. Faraday Soc., 1963, 59, 1397 DOI: 10.1039/TF9635901397
The reported structures of tungsten bronzes include cubic, pseudocubic, tetragonal, orthorhombic, and monoclinic distortions of the perovskitetype structure; well-characterized tetragonal and hexagonal structures, as found in the series K x WO 3; and some unit cells which are reported for isolated phases. This work su…
Abstract Results are presented for electron spin resonance measurements carried out at room temperature on freshly powdered high purity quartz and fused silica. As a result of the powdering, unpaired electrons are produced in concentrations of 10 14 to 10 15 per gram, depending on the particle size. The thermal stabil…
If J ( t )- iK ( t ) is the mean value of FF * for cells separated a distance t in the hkl direction, the mean-square broadening due to mistakes is W 2θ = - [λΔ(2θ) / 2π 2 cos θ] × [ J '(0) / J (0)] - [λ 2 / 4π 2 cos 2 θ] [ J ''(0) / J (0) + { K '(0) / J (0)} 2 ] where Δ(2θ) is the range of 2θ used in evaluating W 2θ…