Materials Literature
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The deuterium permeation through several copper alloys has been measured over a temperature range of 550 to 830 K using the membrane technique. In some cases, the hydrogen permeability was also measured. The results were divided into three categories: common alloys, gold alloys, and stable oxide forming alloys. Common…
The incommensurate (I) state of the triple charge-density-wave (CDW) in 2H–TaSe 2 is studied on the basis of McMillan's phenomenological free energy. A sufficiently large number of harmonics is taken into account to describe the I state precisely. Model calculations based on this theory predict the first-order incomme…
Single crystals of 3-percent Si-Fe with near
Focusing properties and aberration coefficients are calculated for electrostatic einzel lenses suitable for use as preaccelerator lenses in field-emission electron guns. Various lens shapes are analyzed, and asymmetric designs with conical central electrodes are found to have reduced spherical aberration. A lens shape…
Tritium diffusion coefficients and deuterium solubilities were measured for silicon carbide. At 500° to 1300° C, measured tritium diffusion coefficients were much lower than the recorded values for metals, whereas the activation energies for diffusion were much higher (30 to 75 kcal/mol). The solubility of deuterium i…
Abstract It was shown that some block copolymers and their blends with corresponding homopolymers exhibit stress softening. When the specimens are stretched beyond the yield point, they become rubbery and exhibit high elasticity and large recoverable deformation, as a result of a breakup of their original rigid struct…
The relative intensities of the transitions occurring in the fluorescence spectrum of KY3F10: 1% Eu have been measured at 77 and 4 K. By using the computed eigenfunctions for each Stark level, the Judd–Ofelt theory is used for calculations of the electric dipole intensities. The nine phenomenological parameters allowe…
An experimental study has been made of the interrelation of grain boundary sliding, crystal deformation and intergranular fracture during creep of copper bicrystals. The observed sliding behaviour was analysed on the basis of the movement of lattice dislocations along the grain boundary. The results show that grain bo…
After gold particles are deposited onto an oxidized aluminum strip by the evaporation of gold in argon, tunnel junctions can be formed by making contact to the particles with a thin gold film. Red polarized light is emitted from these junctions when a few volts of potential difference is applied. Such junctions can be…
The structural transition between ring and chain molecules in liquid selenium is explained by a disordered chain model which includes a part of both the Se–8 ring and helical chain conformations in a single molecule. Also are discussed the enthalpy change for the dissociation of chain molecules and the mean length of…
Films formed on iron exposed to phosphate, chromate, nitrite, molybdate, tungstate, and arsenate solutions have been characterized using Auger electron spectroscopy and ellipsometry. It was found that the films could be divided into three groups based on their optical properties. The protective quality of films within…
CNDO/2 molecular-orbital calculations are shown to predict trends in bridging angle, ∠T-Y-T, with reasonable accuracy for gas-phase molecules of the type TX3YTX3, where Y is an anion (= O, OH, S, NH) bridging the tetrahedrally coordinated cations T(= C, Si, Al, Be, B) and where X are the nonbridging anions (= H, F). F…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron(III) chelates with hexadentate ligands from triethylenetetramine and .beta.-diketones or salicylaldehyde. Spin state dependent crystal and molecular structures of [Fe(acac)2trien]PF6(S = 5/2), [Fe(acacCl)2trien]PF6(S = 5/2), [Fe(sal)2trien]Cl.2H2O(S = 1/2), and [Fe(sal)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChirality of oxidized and reduced octadecamolybdodiphosphate anions. Observation of a Pfeiffer effectJames F. Garvey and Michael T. PopeCite this: Inorg. Chem. 1978, 17, 5, 1115–1118Publication Date (Print):May 1, 1978Publication History Published online1 May 2002Published i…
Films of and containing excess Si were prepared by chemical vapor deposition at 700°C by the reaction of gaseous and for the Si‐rich and for the Si‐rich . By adjusting the gas‐phase ratio of the reactants it was possible to vary the amount of Si in the films. Transmission electron microscopy studies revealed that the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeroxotitanium(IV) porphyrins. Synthesis, stereochemistry, and propertiesRoger Guilard, Jean Marc Latour, Claude Lecomte, Jean Claude Marchon, Jean Protas, and Denis RipollCite this: Inorg. Chem. 1978, 17, 5, 1228–1237Publication Date (Print):May 1, 1978Publication History P…
This paper investigates the deformations and stresses in the buttocks of a person when he sits on a cushion. The study is motivated by the need for a better understanding of the design of wheelchair cushions and the prevention of decubitus ulcers. The finite element method is used on an axisymmetric model. Surface pre…
Fermi-surface instability leading to charge density waves is a common malady in anisotropic metals, and there is now evidence that it also infects isotropic ones.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and structure of anhydrous zinc chlorideJ. Brynestad and H. L. YakelCite this: Inorg. Chem. 1978, 17, 5, 1376–1377Publication Date (Print):May 1, 1978Publication History Published online1 May 2002Published inissue 1 May 1978https://pubs.acs.org/doi/10.1021/ic5018…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoreduction and photodecarboxylation of pyruvic acid. Applications of CIDNP to mechanistic photochemistryG. L. Closs and R. J. MillerCite this: J. Am. Chem. Soc. 1978, 100, 11, 3483–3494Publication Date (Print):May 1, 1978Publication History Published online1 May 2002Publ…