Materials Literature
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A model is developed for the thermally activated motion of 1/2〈110〉 superpartial dislocations on {010} planes and 1/3〈112〉 superpartials on {111} planes, when antiphase boundaries on {111} planes are unstable. These two superpartials are sessile because they have non-planar cores. The model is based on Duesbery′s mode…
We analyze the thermodynamic properties of the metal-insulator transitions at nonzero temperature in the paramagnetic phase, within a model proposed recently. The correlated motion of electrons is expressed through a band narrowing \ensuremath{\Phi} which reflects a restricted hopping of electrons due to on-site Coulo…
Abstract The Nriagu polymer model of 2:1 layer type clay minerals develops from the premise that clay minerals are condensation copolymers of solid hydroxides. In the Mattigod-Sposito formulation of the model, standard state chemical potentials (standard Gibbs energies of formation from the elements) of 2:1 clay miner…
Liquid–solid and solid–state phase equilibria have been studied in the Ni–NiAl–Ni3Ta triangle of the Ni–AI–Ta system, using a combination of several experimental techniques. Five primary phases occur in this region, including the ternary compound, π, Ni6TaAI, which enters into equilibrium with each of the other four.…
The main problem to be solved before advanced engineering ceramics can become industrial reality is that components having reliable and consistent properties cannot be made, and rejection rates can be as high as 95%, in stark contrast to the situation with metals and polymers. This results from the small size of defec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBonding mode of axial thiocyanate ligands of iron macrocyclic complexes. Crystal structure of [Fe(TIM)(SCN)2]PF6M. J. Maroney, E. O. Fey, D. A. Baldwin, R. E. Stenkamp, L. H. Jensen, and N. J. RoseCite this: Inorg. Chem. 1986, 25, 9, 1409–1414Publication Date (Print):April 1…
High-density ThO2-2% UO2 (233U) pellets are a strong candidate fuel for advanced pressurized heavy water reactors. A process flow sheet based on sol-gel microsphere pelletization has been developed for the first time for fabrication of high-density mixed-oxide pellets at relatively low compaction pressures (350 MPa) a…
Abstract New nickel(II) and palladium(II) complexes having both hydrido and arylthiolato ligands, MH(SAr)(PCy3)2, and complexes with aryl and mercapto ligands, Ni(Ar)(SH)(PEt3)2 (M = Ni, Pd; Ar = C6H5-,p-CH3-C6H4-, p-CH3OC6H4-), were prepared. Thermolysis of these complexes caused cleavage of the S–C or S–H bond to ev…
Abstract The effects of selected cationic and anionic impurities on the precipitation of gypsum in aqueous brine have been studied in a continuous MSMPR crystalliser. Crystal size distributions, determined by in situ Malvern laser light‐scattering measurements, were found to be bimodal. The suspected presence of agglo…
Equilibrium sorption of cadmium and copper ions by modified and unmodified maize stalk was studied using a range of metal-ion concentrations and temperatures at various metal ion-substrate contact periods. The amount of metal ion removed from solution depended on the metal ion concentration, the metal ion-substrate co…
Abstract Graft copolymers of acrylonitrile and of acrylic acid monomers on cellulosic materials were obtained by use of ceric ion initiator in aqueous medium at a 50% (w/w) cellulose‐monomer ratio. The variations of poly(acrylonitrile) grafts and of the efficiency of grafting with ceric ion concentration, and of poly(…
The plastic deformation around spherical indentations on a {100} face of single crystals of MgO has been studied with cathodoluminescence in a scanning electron microscope and by optical interferometry. Bd on the experimental observations, a model is presented which relates the movement of the displaced material, the…
The surfaces of cells of several species of cyanobacteria have been studied using low-temperature scanning electron microscopy (SEM), and have been shown to be covered in a layer of hydrated mucilage. This mucilage is observed in specimens of Anabaena azollae adhering to plant cells in their natural symbiotic niche (t…
Abstract Polyethyloxazoline (PEO x ) blends with several other thermoplastic polymers were examined by differential scanning calorimetry (DSC) for miscibility. Styrene/acrylonitrile (SAN) copolymers having compositions in the range of about 20–40% acrylonitrile (AN) by weight were found to be miscible with PEO x where…
Incubation of the neutral metalloendopeptidase thermolysin at pH 7.2 in the presence of EDTA and/or low concentrations of calcium ions produces fast enzyme inactivation as a result of autolysis. The 'nicked' protein is a folded species composed of three tightly associated protein fragments. Dissociation of this comple…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural characterization of the first phosphorus-centered Baker-Figgis .gamma.-dodecametalate: .gamma.-Cs5[PV2W10O40].cntdot.xH2OP. J. Domaille and R. L. HarlowCite this: J. Am. Chem. Soc. 1986, 108, 8, 2108–2109Publication Date (Print):April 1, 1986Publicat…
A new tool to analyze the hot electron problems at the product level is introduced. The method combines the latest night vision technology and computer image processing techniques to precisely locate the transistors most vulnerable to hot electron degradation. A dual microchannel intensifier is coupled to a solid stat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and crystal structure of a hexaaza macrocyclic complex of lutetium(III)G. Bombieri, Franco Benetollo, A. Polo, L. De Cola, D. L. Smailes, and L. M. VallarinoCite this: Inorg. Chem. 1986, 25, 8, 1127–1132Publication Date (Print):April 1, 1986Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Diels-Alder reactions of protoporphyrin IX dimethyl ester with electron-deficient alkynesVeronica Scherrer Pangka, Alan R. Morgan, and David DolphinCite this: J. Org. Chem. 1986, 51, 7, 1094–1100Publication Date (Print):April 1, 1986Publication History Published online1…
Abstract Alternating mica-like and smectite-like layers of rectorite give rise to periodically varying contrast in 10-Å lattice fringes, yielding a periodicity of 20 Å in a transmission electron microscopic study. Expansion of rectorite using dodecylamine hydrochloride yields a three-layer repeat of thickness 32–35 Å,…