Materials Literature
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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…
Summary Forsterite formed from serpentine powders at various temperatures up to 800° C has been measured quantitatively by X-ray diffraction. The results are considered in relation to a reaction mechanism proposed by Ball and Taylor and are shown to be inconsistent with the details of this mechanism. An alternative me…
Oxidation characteristics of Type 304 stainless steel in CO2 were observed over the temperature range 1100-1800 F (593-982 C). Although in general oxidation rate curves were parabolic, several periods were observed in which they were approximately linear. These breaks were reproducible and thought to be associated wit…
Abstract Electrical conductivity and dynamic shear modulus measurements were made simultaneously on carbon black‐filled natural rubbers. G ′ the in‐phase shear modulus, and the electrical conductivity, C , were shown to vary in an approximately similar way as the amplitude of dynamic oscillation was increased. Both G…
Susceptibility measurements have been carried out on single-crystal LaCoO3 in the temperature range of 4.2° to 300°K. We find an effective magnetic moment squared that agrees with Heikes et al. at 300°K, but which falls more rapidly with decreasing temperature. Paramagnetic resonance measurements at 4.2°, 77°, and 300…
Standard magnetostriction theory constructs a free energy from three terms: the energy of a rigid magnetized body, the energy of a nonmagnetic elastic body, and the volume integral of an interaction energy-density linear in the strains. This procedure is open to three criticisms. First, strains invalidate the magnetic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of Lithium Aluminum HydrideJacob Block and A. P. GrayCite this: Inorg. Chem. 1965, 4, 3, 304–305Publication Date (Print):March 1, 1965Publication History Published online1 May 2002Published inissue 1 March 1965https://pubs.acs.org/doi/10.1021/ic5002…
Summary In the “terra firme” of the Amazon basin near Manaus, podzol soils occur carrying heath forest. The parent materials are geologically young sandy sediments deposited in valleys. There are no indications that man's activity is one of the pedogenetic factors of the podzol development. Podzols have gradational co…
The Eyring Model has been used to derive the "power rule" for capacitors. Analytical models for evaluating progressive and step stress tests are presented. Various methods are discussed for determining the value of the exponent for the power rule. In particular, the relation between the exponent of the power rule and…
Stacking-fault tetrahedra have been observed in plastically deformed specimens of copper, silver, gold and several alloys. A dislocation reaction is proposed for the formation of these defects during deformation. From the size of the largest tetrahedra, estimates of stacking-fault energy are made which indicate that t…
Abstract The scheme and treatment of the kinetics of scorch-delay vulcanization proposed in a previous paper were applied to natural rubber sulfur vulcanization accelerated by 2,2′-thiobisbenzothiazole (MBTS), 2-(N-cyclohexyl)benzothizaolesulfenamide (CBS), 2-(N-morpholinothio)benzothiazole (MOR), or 2-(N,N-diisopropy…
Pratt and Bailey have recently explained the optical and anomalous magnetic properties of Cr2O3 by means of a model consisting of the basic Cr2O3 antiferromagnetic structure with moments canted away from the c axis and forming some kind of spiral. Our neutron powder-diffraction data confirm the original Brockhouse mom…