Materials Literature
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Vacuum-purified niobium crystals of various orientations have been tested in tension and compression, mainly at room temperature and 158 °K. The observed slip planes were almost always of the {101} or {211} type, and the asymmetry of the stress for slip on {211} has been confirmed at both temperatures. The critical re…
Various orientations of single crystals of niobium, purified by ultra-high vacuum annealing, have been tested in compression at 295 °K and in tension at temperatures between 77 °K and 295 °K. The shear stress – shear strain curves show three-stage hardening in a manner similar to f.c.c. crystals. Analysis of the orien…
The surface reaction of soda‐lime‐silica, sodium borosilicate, soda‐zirconia‐silica, and soda‐alumina‐silica glasses with pure molten sodium hydroxide and potassium hydroxide was investigated at 350° and 425°C, respectively. Chemical durability of these glasses is assessed in terms of an acid‐base concept in which the…
The shrinkage temperature (Ts) in 0'9% saline of the collagen of a number of marine and terrestrial gastropods living in a wide range of temperature conditions has been examined and found to correlate with the environmental temperature of the source, i.e. the higher this environmental temperature the higher is Ts.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTautomerism exchange in B3H7.N(CH3)3 and B3H7.-THFMorey A. Ring, Edward F. Witucki, and R. Clive GreenoughCite this: Inorg. Chem. 1967, 6, 2, 395–396Publication Date (Print):February 1, 1967Publication History Published online1 May 2002Published inissue 1 February 1967https:…
Low-density polyethylene sheathing materials have water vapor permeabilities on the order of 10−8at 22°C. High-density polyethylenes have permeabilities about one-third to one-sixth that of the low-density polyethylene. Copolymers of polyethylene have higher permeabilities than the homopolymer. As an example, 15 perce…
The effects of solute type and concentration upon the nature of, and stresses for, plastic flow in polycrystalline iron solid solutions have been examined. An extensive study was made using Al, Be, Ge, P, Si, and Sn; limited examples with Co, Sb, and Ti are also included. Three experimental observations stand out: (i)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexes derived from 1,3-diiminoisoindoline-containing ligands. II. Stepwise formation of nickel phthalocyanineThomas J. Hurley, Martin Alvin Robinson, and Samuel I. TrotzCite this: Inorg. Chem. 1967, 6, 2, 389–392Publication Date (Print):February 1, 1967Publication Histor…
The strength of a linear dislocation pileup depends on the nature of its barrier. Analysis is given for the case in which the barrier is a second-phase particle and for that in which the barrier is a locked dislocation with a different Burgers vector.In the first case, where pileups lie in front of hard inclusions, it…
The EPR spectra of interacting pairs of Dy 3+ , Tb 3+ , and Ho 3+ ions in rare-earth ethyl sulfates have been studied in order to determine the nature and magnitude of the interactions. The departures from dipole–dipole interaction are mostly rather small, except for the interaction between a pair of Dy 3+ ions, one o…
The method of continuously distributed dislocations is used to obtain the exact solution for the distribution of screw dislocations in a linear array of length L piled up against a circular inclusion of radius R and finite shear modulus. The solution presented is valid for 0 < G 2 /G 1 < ∞, where G 2 is the shea…
The fine structure of Bombyx mori silk fibroin was investigated by electron microscopy and X-ray diffraction techniques. Examination of silk fibers fragmented with ultrasonic radiation and negatively stained revealed the presence of ribbon-like filaments of well-defined lateral dimensions. Analysis of the breadths of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of Metal Hydrides. I. Reactions of Some Platinum(II) HydridesH. C. Clark and W. S. TsangCite this: J. Am. Chem. Soc. 1967, 89, 3, 529–533Publication Date (Print):February 1, 1967Publication History Published online1 May 2002Published inissue 1 February 1967https://…
It has been observed that in polycrystalline cadmium regions of linear hardening insensitive to temperature and strain rate occur at temperatures below 150 °K. The extent of this region increases as the temperature decreases. The hardening coefficients of single crystals are also independent of temperature below 150 °…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of coordination compounds. XVI. Hexabromoplatinate(IV) and hexaiodoplatinate(IV) ionsVincenzo Balzani, Maria F. Manfrin, and Luca MoggiCite this: Inorg. Chem. 1967, 6, 2, 354–358Publication Date (Print):February 1, 1967Publication History Published online1 May…
Au-SiO2 thin-film cermets have been deposited by simultaneously dc sputtering Au and rf sputtering SiO2. The electrical resistivity varies exponentially with Au concentration, and the microstructure shows discontinuous networks of Au and SiO2.
Recent observations relating to the critical resolved shear stress for slip in tantalum and tungsten are reported. The results of tensile and compressive deformation are discussed in terms of the operative slip systems and the possible asymmetry of {112} [Formula: see text] slip. It is concluded that the asymmetry hyp…
Abstract The combined use of electron microscopy and of selected area diffraction (SAD) has been applied to the study of montmorillonites from Wyoming and from Camp-Berteaux, of nontronite, and of hectorite. The study shows that only the elementary layers of the Wyoming montmorillonite and of the nontronite are single…
The effect of electron traps on the current-voltage (J-V) relationship and the charge distribution in insulators, under conditions of space-charge-limited current flow, is well understood. This paper extends the consideration of trapping effects into the region of emission-limited current flow. Trapped space charge di…
The theory of the Portevin—Le Chatelier effect is extended to include the effect of dislocation multiplication. The dislocation density ρ in Cu-3.2 at. % Sn is measured as a function of true plastic strain ε by the transmission electron microscopy of thin films, and the relation ρ= 4.73 × 1011 ε1.17 established. The e…