Materials Literature
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A variational calculation of the eigenstates of the three-dimensional analogue of Holstein's Molecular Crystal Model is utilized as a basis for determining the conditions under which carrier self-trapping does or does not occur in this system. It is found that below a temperature-dependent critical value of the electr…
The d.c. electrical conductivity of 14% (by weight) sulfonated polystyrene films was measured as a function of temperature from 20° to 60°C in a 25-micron vacuum. Sulfonated films in the silver, cadmium, and methylene blue sorbed forms were prepared for these electrical measurements. Plots of log specific conductance…
An unusual magnesium carbonate hydrate mineral, Mg5 (CO3)4 (OH)2•8H2O, was found as encrustments of snow-white oolitic, botryoidal and reniform aggregates on the weathered surface of the brucite-bearing serpentinites from Yoshikawa, Aichi Prefecture, Japan. The empirical formula is similar to that of hydromagnesite ex…
A description of the apparatus for a new dynamic polarization effect by variation of temperature, and the experimental results obtained, are presented. As described earlier a temperature jump produces a very large enhancement of the dipolar signal (about 10.000) in solid y-picolene due to the dipolar couplings between…
Abstract The rate of release of interlayer potassium from biotite to NaCl and NaCl/sodium tetraphenylboron solutions is determined by the oxidation state of octahedral iron. Octahedral cation vacancies are generated when octahedral iron is oxidized resulting in a change of orientation of hydroxyl from perpendicular to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and Mechanism of Carbonation of Magnesium Oxide SlurriesG. L. Smithson and N. N. BakhshiCite this: Ind. Eng. Chem. Process Des. Dev. 1973, 12, 1, 99–106Publication Date (Print):January 1, 1973Publication History Published online1 May 2002Published inissue 1 January…
Crystals of the title compound are monoclinic, space group P21/c with unit cell dimensions: a= 5·64, b= 9·80, c= 6·88 Å, β= 98·8°. The structure, which was determined from photographic X-ray data by Patterson and Fourier methods, consists of a slightly distorted hexagonal close packed array of carbonate ions in which…
The theory of the propagation of light along the axis of a cholesteric liquid crystal is considered. Two models have been used so far, viz., the spiralling dielectric ellipsoid model of Oseen, treated theoretically by de Vries, and the twisted pile of birefringent plates treated according to the dynamical theory by Ch…
In dielectrically positive mixtures of the nematic N4 with cholesteryl-chloride an unusual texture transition was observed which can be applied in a storage effect. The variation of several characteristic parameters of these mixtures with concentration and temperature was measured.
The present paper deals with the description of 60 pollen and spore species found in Palaeocene sediments of the Chubut Province, Argentina. The material was collected from several sections of the Salamanca Formation (Cerro Abigarrado, Puerto Visser, Bajada de Hansen) and from other sections of the Bororo Formation. A…
Experiments were conducted with pitting corrosion of the ends of titanium rods insulated on the sides with epoxy resin. The rods were potentiostated in the anode‐facing‐up position in chloride, bromide, and iodide solutions. After a small depth of corrosion a uniform current density was obtained characteristic of one‐…
A survey is given of electric alignment in liquid crystals, emphasizing electro-optical effects and the physics behind them.
When iron–vanadium–carbon alloys are transformed from the γ to the α state, a banded dispersion of vanadium carbide is formed as the transformation fronts move through the crystals. The strengthening resulting from this reaction in a series of alloys isothermally transformed in the range 725–850° C is shown to be depe…
The paper discusses the dependence of γ-the coefficient of potential emission of electrons from metals on the work function ϕ and Fermi energy εF for metals and the ionization energy of ions Ei . It has been found that in the range 3ϕ <Ei<2(∊F+2ϕ) Deviations from this dependence exceeding 10% have been observed at Ei<…
Experiments were conducted in which pitting occurred at the edges and on the circumference of holes in titanium foil in chloride, bromide, and iodide solutions under potentiostatic conditions. Valence of dissolution was approximately 4. The effect of potential, temperature, concentration, p H, and solution flow on cur…
The Profile Analysis technique for neutron powder diffraction patterns has been used to show that the lowest temperature phase of barium titanate is rhombohedral R3m with cell angle α = 89.868 ± 0.004°at 77.4 K. The atomic displacements from the cubic perovskite positions are along [111], and have magnitudes of δ (Ba)…
The Onsager theory for the liquid crystal phase transition of a gas of hard rods is known to be accurate if the rods are long enough. In order to quantify the necessary length, the first correction term (the third virial coefficient) to the Onsager theory is estimated numerically. On the basis of a study of the behavi…
The peel strength of rubber and paint films has been measured over a range of peeling velocities using a dead weight method. At low peel rates the peel force is fairly constant but rises rapidly at higher peeling speeds. Experiments show that the peel strength is a function both of the energy of interfacial bonds whic…
The structure of the ferro electric phase of Triglycine Sulfate has been refined from neutron diffraction data. The hydrogen bonding scheme proposed by Hoshino, Okaya and Pepinsky2 has been confirmed. The short hydrogen bond between glycine II and glycinium III that has been postulated to cause the transition has been…
1. A Brief History. 2. Glass and Glass Fibres. 3. The Products and Manufacturing Processes. The products. An outline of the manufacturing processes. 4. Glass Manufacture. Glass compositions. Selection of raw materials for E glass manufacture. Handling, weighing, and mixing of raw materials into batch. Production of E…