Materials Literature
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Contrary to the traditional view, unnotched direct tension test specimens of quasi‐brittle materials that exhibit post‐peak strain softening do not deform symmetrically. After passing the peak load, the equilibrium path bifurcates and the secondary postbifurcation branch represents flexing to the side. The bifurcation…
Indentation crack initiation and propagation in tempered glass surfaces are examined and the results compared to those in annealed and in ion‐exchange‐strengthened glasses. The presence of surface compression due to tempering inhibits median crack initiation during the loading cycle of the indentation and depresses th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe layered ternary germanium tellurides ZrGeTe4, HfGeTe4, and TiGeTe6: structure, bonding, and physical propertiesArthur Mar and James A. IbersCite this: J. Am. Chem. Soc. 1993, 115, 8, 3227–3238Publication Date (Print):April 1, 1993Publication History Published online1 May…
This work treats many-body aspects in an idealized class of reversible binding problems involving a static binding site with many diffusing point particles. In the noncompetitive limit, where no restriction exists on the number of simultaneously bound particles, the problem reduces to reversible aggregation. In the co…
It is known from crystallographic investigations that there are two distinct Pt–S modifications, PtS and PtS2 [see R. Collins, R. Kaner, P. Russo, A. Wold, and D. Avignant, Inorg. Chem. 18, 727 (1979); A. Finley, D. Schleich, J. Ackerman, S. Soled, and A. Wold, Mater. Res. Bull. 9, 1655 (1974); S. Soled, A. Wold, and…
X-ray photoemission measurements of high purity CuCl are presented. XPS studies of Cu compounds have been motivated in this laboratory by the need to identify species on high temperature superconductor surfaces which have been chemically etched [see R. P. Vasquez, M. C. Foote, and B. D. Hunt, J. Appl. Phys. 66, 4866 (…
A derivation of the relaxation strength for anelastic and dielectric relaxation of point defects is proposed, and the calculation is extended to cases not yet treated; the formulas reported in the literature can be obtained as particular cases. The relaxation strength is expressed as the sum of the contributions of al…
X-ray photoemission measurements of high purity CuI are presented. XPS studies of Cu compounds in this laboratory have been motivated by the need to identify species on chemically etched high temperature superconductor surfaces [see R. P. Vasquez, M. C. Foote, and B. D. Hunt, J. Appl. Phys. 66, 4866 (1989)].
A series of fluorinated polyinides and fluorinated polyimides containing heterocyclic moieties were prepared and investigated to determine their dielectric constants, dielectric constants as a function of relative humidity (RH) and thermal properties. Thle fluorinated polyimides containing heterocyclic moieties were p…
Abstract The Rietveld method requires a two-part starting model (see Chapter 1 and elsewhere), a structural model based on approximate atomic positions and a non-structural model which takes into account the contributions of individual line profiles in terms of analytical or other differentiable functions. Both must b…
Abstract Since the initial studies of chlorite polytypes, it has been suggested that the stability of the various polytypes may be a function of the temperature at which the mineral formed; however, few studies have been performed in which polytypes of chlorite in a specific suite of samples have been determined and c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of an optically active helical bis-cobaltocenium ionAdam M. Gilbert, Thomas J. Katz, William E. Geiger, Matthew P. Robben, and Arnold L. RheingoldCite this: J. Am. Chem. Soc. 1993, 115, 8, 3199–3211Publication Date (Print):April 1, 1993Publication Hi…
The hpaB gene encoding an aromatic hydroxylase of Escherichia coli ATCC 11105, a penicillin G acylase-producing strain, has been cloned and expressed in E. coli K-12. This gene was located near the pacA gene coding for penicillin G acylase. The hydroxylase has a molecular mass of 59,000 Da, uses NADH as a cosubstrate,…
Raman-heterodyne-detected paramagnetic resonance has been used to study the level anticrossing in the $^{3}$A state of the N-V defect in diamond. The electron-paramagnetic-resonance (EPR) frequencies are well accounted for by a triplet-spin Hamiltonian. Comparison of the EPR spectra with the calculated transition dipo…
A modification of the extended Hildebrand equation is proposed to estimate the solubility of an organic drug in solvent mixtures. The equation accurately reproduces the solubility of four sulphonamides in dioxane-water mixtures without requiring the heat of fusion of the solute. A single equation is obtained for predi…
For protecting mild steel from corrosion, amino-trimethylidenephosphonic acid (ATMP) was more effective than 1–hydroxyethylidene diphosphonic acid (HEDP), N.N–dimethylidenephosphonoglycine (DMPG), 1–ethyl-phosphonoethylidenediphosphonic acid (EEDP), and ethylenediaminetetramethylidenephosphonic acid (EDTMP). A 20-min…
Spontaneous electron transfer, along with anion uptake by doping, form the basis of a new concept for the reduction of toxic Cr(VI) using an electronically conductive polymer, e.g. , polypyrrole. Proof of concept experiments are described which show that aqueous sulfuric acid solutions containing 5–100 ppm Cr(VI) can…
Abstract Free‐radical reactions, which are relevant in the chemical modification of polymeric materials, are discussed in relationship to their influence on random chain scission. A mathematical model is developed to calculate the entire molecular weight distribution (MWD) with the degree of chain scission as the sole…
Using potentiodynamic and transient electrochemical methods and weight loss shows that N-alkylbetaines are good inhibitors of iron corrosion in HCl at concentrations around the critical micelle concentration (CMC). High corrosion inhibition is observed when medium pH value is lower than organic compound pKa. When the…
La 2 Ti 2 O 7 , M r =485.613, monoclinic, P2 1 , a=7.812 (2), b=5.5440 (7), c=13.010 (2) A, β=98.66 (1) o , V=557.0 (4) A 3 , Z=4, T=298 K, D x =5.790 Mg m -3 , λ(Mo Kα)=0.71073 A, μ=17.86 mm -1 , F(000)=856. The crystals are twinned. The twin I and twin II intensities are superimposed in reciprocal-lattice layers wit…