Materials Literature
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The results of pulse echo measurements on polycrystalline V-Cr samples with approximately 0, 20, 40, 60, 80 and 100 at.% Cr show that the bulk modulus B and the shear modulus G increase nearly linearly with increasing chromium content between 0 and 80 at.% and between 40 and 100 at.% respectively. Due to the Neel poin…
The thermoluminescence of LiF TLD-100 dosimeter crystals has been studied using recently developed equipment for determining simultaneously the emission intensity and the emission spectrum as a function of sample temperature. Measurements were made on numerous samples exposed to 60Co irradiations at room temperature a…
The rate constants for the deactivation of O(1D) by Xe, Kr, and Ar were measured over the range 110–330 K. Only Xe had a significant temperature dependence. Its Arrhenius expression is { (8.5±1.7) ×10−11 exp[(−103±52)/RT] cm3/molecule⋅s} (E in cal/mole). The rate constants for Kr and Ar are (6.4±1.3) ×10−12 and (5.0±1…
Bulk cadmium stannate, Cd2SnO4, normally crystallizes in the orthorhombic system. Cadmium stannate obtained from sputtered thin films and from a high-temperature, high-pressure procedure has now been shown, on the basis of an X-ray diffraction investigation, to crystallize in the cubic system. The lattice parameter of…
The difficulties involved for the measurement of the circular magnetisation as a function of the circular magnetic field in ferromagnetic wires are discussed. An experimental arrangement which allows the study of the M phi -H phi hysteresis loops is shown.
Abstract The structure and behavior of homoionic bentonites was markedly affected by a grinding procedure often applied to clays. The main changes observed on clay powders were the breakage of weakly bound large aggregates, the reduction in the tactoids’ thickness by delamination, the reduction in the plates’ area, an…
Abstract The wetting behavior of human hair in water has been investigated using a technique based on the Wilhelmy balance principle. The experimental technique makes it possible to study the relaxation effects occurring at the solid–liquid–air interface. The results strongly suggest that interactions between the soli…
Upper bounds are derived to the many-electron density ${\ensuremath{\rho}}_{k}({x}_{1}, \dots{}, {x}_{k})$ ($2\ensuremath{\le}k\ensuremath{\le}n$) of an $n$-electron atomic or molecular wave function. The derivation is based on former results on the decay of the one-electron density and on the "Schr\"odinger inequalit…
“True” double bonds between tetravalent silicon and oxygen are present in molecular SiO 2 , now isolated by a novel matrix technique. This was accomplished by cocondensation of SiO (from a Knudsen cell) and O (generated by microwave excitation) in argon on a cold surface.
Abstract The thermal stability and degradation kinetics of several polystyrenes and styrene–alkyl methacrylate copolymers and terpolymers with a number‐average molecular weight ( M̄ n ) of 6000–250,000 g/mole have been studied using dynamic thermogravimetry (TG). The degradation kinetics of each polymer sample have be…
Abstract Small‐angle x‐ray scattering (SAXS) of isotropic or uniaxially oriented nylon 6 was investigated as a function of thermal and mechanical history. In addition to the peak position and linewidth of the SAXS maximum, the integrated SAXS intensity was measured. It was found that the radial intensity distributions…
Abstract Ultraoriented films of high density polyethylene (HDPE) have been prepared in continuous lengths by a new method, solid state coextrusion, through conical dies of extrusion draw ratios up to 36. Preformed HDPE billets ∽7 cm long and ∽1 cm in diameter of duPont Alathon 7050R, M w = 59,000, M n = 19,900, were s…
The thermoluminescence kinetics have been determined for the 13 glow peaks contained in the glow curves obtained from LiF TLD-100 after exposure to 60Co irradiations. The glow curves were constructed from measurements made with recently developed equipment for recording emission spectra at closely spaced temperature i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT(3-Methyl-3-methoxy-1-butynyl)copper, a useful reagent for the generation of mixed cupratesE. J. Corey, David Floyd, and Bruce H. LipshutzCite this: J. Org. Chem. 1978, 43, 17, 3418–3420Publication Date (Print):August 1, 1978Publication History Published online1 May 2002Publ…
Lead-zirconate–lead-titanate (PZT) thin films with perovskite and pyrochlore structures were successfully fabricated on several kinds of substrates by rf diode sputtering. Semiquantitative compositional analysis of the deposited thin films were made with Auger electron spectroscopy (AES). The films were deposited from…
It has been shown that the sensitization of Type 304 stainless steel occurs at temperatures well below the normal isothermal temperature range for sensitization. A prerequisite for this low temperature sensitization (LTS) is the presence of chromium carbide nuclei along grain boundaries. This paper shows that the ther…
Abstract An experimental study was carried out to investigate the effects of titanate coupling agents on the rheological properties of p articulate‐filled polyolefin melts. Inorganic fillers used were CaCO 3 , talc, and fiberglass, and polyolefins used were high‐density polyethylene (HOPE) and polypropylene (PP). It w…
Abstract Ethanol was catalytically produced in the CO–H2 reaction under atmospheric pressure and at 150–250 °C over rhodium crystallite catalysts prepared from Rh carbonyl cluster compounds highly dispersed on La2O3, TiO2, and ZrO2. The activity and selectivity of ethanol formation depend on the kind of metal carbonyl…
In the present study, the correlation between fractional ionic character and dielectric constants is applied to predict the magnitudes of the static dielectric constant ε0 of the several alkaline-earth-chalcogenide solids. The calculated values of ε0, together with the other known experimental data of these solids, ar…
Abstract The thermodynamic theory of the elastic and dielectric properties of ammonium dihydrogen phosphate is developed on the basis of the improper phase transition. By the representation analysis the transformation properties of the two‐component order parameter are investigated and the thermodynamic potential of t…