Materials Literature
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We have studied the variation of the Curie temperature θf and the spontaneous magnetization σs of several transition metals and some of their solid solutions as a function of the pressure. The measurements were carried out between 77° and 700°K. In the system Ni–Si, dθf/dp varies from 0.32×10−3 °K bar−1 for pure nicke…
Simultaneous and independent measurements have been made of the magnitude and direction of the lattice twist and of the direction of the Burgers vector of the axial dislocations in filamentary crystals of AlN, using electron microscopy and electron diffraction. The twist was revealed by extinction contours from reflec…
Summary When crocidolite (fibrous riebeckite, Na 2 Fe 3+ 2 Fe 2+ 2·6 Mg 0·4 Si 8 O 22 (OH) 2 approx.) is heated in argon or nitrogen at 50–400°C, uncombined water is lost. The tensile strength drops sharply at 300–400°C. At 500–600°C under static, or 570–700°C under dynamic conditions, an endothermic dehydroxylation y…
A series of tests was conducted on flat steel beams of various sizes and material properties, using sheet explosive to provide sufficiently high uniform impulsive loading to produce significant plastic deformation. The beams were attached to a ballistic pendulum for measurement of applied impulse, and were photographe…
Abstract A method is described for the preparation of acetate peels of stained carbonate rocks. The stains transferred are: Alizarin red-S (for the detection of calcite), potassium ferricyanide (for the detection of ferrous iron-bearing calcite or dolomite), and Feigl's solution (for the differentiation of aragonite f…
The electrical resistance of tellurium was measured at pressures to 60 kbar and temperatures to 600\ifmmode^\circ\else\textdegree\fi{}C in a tetrahedral anvil device. A semiquantitative resistance-pressure-temperature phase diagram was determined, showing three solid polymorphs and the liquid phase. The room temperatu…
Stress corrosion cracking behaviors of several laboratory and commercially produced heats of 18, 20 and 25 percent Ni maraging steels have been observed in marine and industrial atmospheres and in sea water. Resistance of 18 percent Ni maraging steels was strongly affected by their structure and thermal histories. In…
Measurements have been made of the magnetic moments of compounds of the type R6Mn23, where R is a rare-earth ion. Determination of the saturation moments of Mn with nine of the rare earths (Sm, Nd, Gd, Tb, Dy, Ho, Er, Tm, and Lu) show that, with one exception, the rare-earth and manganese moments are antiparallel; onl…
The crystal structure of the tetragonal modification of ZnP~ has been determined from threedimensional single-crystal X-ray data. All the atoms are tetrahedrally coordinated. Each zinc atom is bonded to four phosphorus atoms while each phosphorus atom is bonded to two zinc and two phosphorus atoms. The structure has n…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColor Sensitization of Zinc Oxide with Cyanine Dyes1Susumu Namba and Yasushi HishikiCite this: J. Phys. Chem. 1965, 69, 3, 774–779Publication Date (Print):March 1, 1965Publication History Published online1 May 2002Published inissue 1 March 1965https://pubs.acs.org/doi/10.102…
Abstract The phase contrast microscope has been used to examine blends of rubber polymers. Mixing on a molecular scale was never observed, the more homogeneous blends consisting of a pair of interlocking “networks” with a mesh diameter of about a micron. Blending was less perfect when the polymers were of widely diffe…
The steady-state melt viscosities of both high density and low density polyethylene have been investigated for a series of samples over four decades of shear rate and a range of temperatures from 120°C (150°C for high density samples) to 300°C. In the case of low density polyethylene a broad range of molecular weight…
Stress‐strain curves are presented for MgO single crystals, compressed with (100) and (111) stress axes, for temperatures from 1000° to 1600°C. The yield stress of (100) specimens decreases slightly in this temperature range. The strain‐hardening rate passes through a maximum at about 1100°C and decreases by a factor…
Magnetization measurements on a single crystal of gadolinium have established that the Curie temperature Tc is 292.5±0.5°K, that the initial susceptibility is given by 1/χ0=A(T−Tc)43 from Tc to 20° above Tc, and that the magnetization is given by σ=CH¼ at Tc. These results are obtained only if measurements are made al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic Investigation of Some Tetracoordinated Nickel(II) and Copper(II) Complexes between 80 and 300°K.L. Sacconi, M. Ciampolini, and U. CampigliCite this: Inorg. Chem. 1965, 4, 3, 407–409Publication Date (Print):March 1, 1965Publication History Published online1 May 2002P…
In oxidic lattices the Co3+ (3d6) ion has been found both in the diamagnetic low-spin state and in the paramagnetic high-spin state. The factors influencing the equilibrium between high- and low-spin Co3+ ions are discussed. New compounds are presented in which the change of the equilibrium distribution among these tw…
Abstract Variability of the physical and chemical properties of pure glauconite is considered. A major cause of the variation in properties is the occurrence of non-structural iron oxides and it is suggested that chemical analyses which have been reported for glauconite should be recalculated. There appears to be an i…
Abstract Calciumiridium(IV)‐oxid existiert in zwei Modifikationen: einer hexagonalen (a = 5,44 1 Å, c = 6,39 2 Å), die beim Tempern einer Mischung von IrO 2 und CaCO 3 entsteht, und einer rhombischen (a = 3,14 5 Å, b = 9,85 5 Å, c = 7,29 3 Å), die in Form von Einkristallen aus einer Schmelze dieser Komponenten mit CaC…
The physical properties of the system CuFe2O4–Fe3O4 point to the existence of the compound CuFe5O8. The activation energies Ea of quenched specimens exhibit an anomaly at the composition CuFe5O8. The log of the resistivities plotted as a function of composition changes slope, the Curie temperatures Tc display a minimu…
Abstract The initial degradation of phenol–formaldehyde polycondensates has been found to follow two distinct pathways. Oxidation of the dihydroxydiphenylmethane unit to substituted dihydroxybenzophenone and dihydroxybenzhydrol species has been observed and substantiated using model compounds to support the characteri…