Materials Literature
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Résumé.- Les joints de grains des isolants, des semiconducteurs et des métaux pré-sentent des propriétés électriques très différentes que nous exposons de manière succinte dans le cas des isolants et des semiconducteurs et de manière plus détail-lée dans celui des métaux. Abstract.- The electrical properties of grain…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative kinetics of axial ligation to ruthenium and iron porphyrin and phthalocyanine complexes. The relationship between spin state and cis- and trans- effectsFrank Pomposo, David Carruthers, and Dennis V. StynesCite this: Inorg. Chem. 1982, 21, 12, 4245–4248Publication…
Development of a special application of hafnium for pressurized water reactor control rods is discussed. A unique feature of the design is the sealing of the hafnium material inside protective stainless steel tubing, whereas in prior applications the hafnium material was exposed directly to the reactor primary coolant…
Abstract. Ecology and morphology of Alcyonium (Parerythropodium) coralloides were studied in different sites of the Eastern Atlantic and the Mediterranean. The species is extremely variable in size, colony shape and colour. In the Mediterranean population, encrusting red colonies are mostly encountered, although lobat…
The electronic states of the V 4+ ions in β-Na 0.33 V 2 O 5 are studied by NMR and EPR measurements. The anomalous temperature dependence of the Knight shift of the 51 V nuclei in site I can be understood by the spin singlet ground state of the electron pairs of the adjacent V 4+ ions (bipolarons). Recent X-ray diffra…
Order-of-magnitude improvement of the quantum efficiency of metal-oxide-metal detectors is achieved in the visible spectrum by fabricating the devices on silica substrates structured with a periodic array of bumps separated by about 0.25 microm. Structuring metallic films affords improved coupling of the detector to v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of .beta.-maltose octaacetate. A model in retrospect for amylose triacetate?F. Brisse, R. H. Marchessault, S. Perez, and P. ZugenmaierCite this: J. Am. Chem. Soc. 1982, 104, 26, 7470–7476Publication Date (Print):December 1, 1982Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen-deuterium kinetic isotope effects of 16 and 22 in the oxidation of hydrogen peroxideJohn A. Gilbert, Susan W. Gersten, and Thomas J. MeyerCite this: J. Am. Chem. Soc. 1982, 104, 24, 6872–6873Publication Date (Print):December 1, 1982Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWavelength-dependent photostable or photoreversible photochromic systemR. Schmidt, W. Drews, and H. D. BrauerCite this: J. Phys. Chem. 1982, 86, 25, 4909–4913Publication Date (Print):December 1, 1982Publication History Published online1 May 2002Published inissue 1 December 1…
Formation of aluminosilicate glasses containing oxides of rare‐earth elements, e.g. Sc, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, and Yb, was studied by melting at 1550°C and air quenching. The upper limit of the amount of rare‐earth oxide which can be incorporated into the aluminosilicate glasses decreases according to the…
Polarized neutron diffraction has been an extremely valuable technique for studying outer electron distributions in magnetic materials through measurements of magnetic form factors. Representative results are presented on the following classes of elemental materials : 3d ferromagnetic metals, paramagnetic metals, rare…
A three-chained peptide from type I collagen, crosslinked by hydroxyaldolhistidine, has been isolated from a tryptic digest of 5 M guanidine.HCl-insoluble bovine skin collagen (a small but as yet unknown percentage of the total collagen in whole skin). OsO(4)/NaIO(4) specifically cleaved the crosslink at its double bo…
Ten cation contaminants, namely Al, Ga, Co, Fe, Mg, Zn, Zr, Ca, Sr, and Ba were investigated for their effects on the electrical properties, microstructures, and discoloration of conductive TiO2 ceramics. It was found that Al, Ga, Co, Fe, and Mg cause discoloration and increase the electrical resistivity by a factor o…
Comparison of the plastic flow properties of transforming metastable austenite, stable austenite, and martensite over a range of temperatures and strain rates allows quantitative estimates of (a) the static-hardening effect of the two-phase mixture and (b) the dynamic-softening effect of the transformation as a deform…
The solubilities of the elements Mg and Ca are determined in monocrystalline silicon. The doping is accomplished using liquid‐phase epitaxy of silicon from Mg/Si or Ca/Si melts. Both Mg and Ca exhibit a strong retrograde solubility. The maximum solubility of Mg in silicon is ; that of Ca in silicon is . The segregatio…
Abstract Mechanical properties of rubber‐modified polymers are not single‐valued functions of rubber/matrix type and rubber content, but also vary with processing conditions. The variations in mechanical properties with processing conditions arise mainly from changes in rubber‐phase dispersion. In our past work, by li…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, properties, and kinetics of the reaction of manganese(0) radicals Mn(CO)3(R3P)2 with tributyltin hydrideSharon B. McCullen and Theodore L. BrownCite this: J. Am. Chem. Soc. 1982, 104, 26, 7496–7500Publication Date (Print):December 1, 1982Publication History Publ…
From the measurement of three-probe resistivities, which are much larger than two-probe resistivities, we conclude that annealed, nominally pure and nearly stoichiometric NiO single crystals normally have a low-resistivity surface layer which masks the behaviour of the bulk in most electrical measurements. Bulk resist…
Improved one-tier and two-tier designs for a high-pressure–low-pressure (HPLP) apparatus are described together with some of their recent applications. These instruments are used for surface analysis and in situ monitoring of catalytic reactions on small samples with a geometrical surface area of 1 cm2. Catalytic reac…
The structure of cyclohexylsilanetriol C6H11Si(OH)3 has been determined by single-crystal x-ray diffraction methods. The molecule crystallizes in the monoclinic system, space group C2/m, with a=7.876(3), b=6.637(6), c=15.802(11) Å, β=95.51(3)° at −60 °C, and Z=4. The intensities of 1031 independent reflections were me…