Orientation dependence of domain wall spacing and losses in 3-percent Si-Fe single crystals.
Single crystals of 3-percent Si-Fe with near
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Electrostatic einzel lenses with reduced spherical aberration for use in field-emission guns
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…
Hydrogen Diffusion and Solubility in Silicon Carbide
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…
Structural Change Accompanied by Plastic-to-Rubber Transition of SBS Block Copolymers
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…
Crystal field parameters for Eu3+ in KY3F1. II. Intensity parameters
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…
Grain boundary sliding and intergranular fracture behaviour of copper bicrystals
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…
Light emission from gold particles excited by electron tunneling
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…
Ring-Chain Transition in Liquid Selenium by a Disordered Chain Model
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…
The Properties of Films Formed on Iron Exposed to Inhibitive Solutions
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…
The use of molecular-orbital calculations on model systems for the prediction of bridging-bond-angle variations in siloxanes, silicates, silicon nitrides and silicon suffides
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…
Iron(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)2trien]NO3.H2O(S = 1/2)
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)…
Chirality of oxidized and reduced octadecamolybdodiphosphate anions. Observation of a Pfeiffer effect
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…
Preparation and Some Properties of Chemically Vapor‐Deposited Si‐Rich SiO2 and Si3 N 4 Films
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…
Peroxotitanium(IV) porphyrins. Synthesis, stereochemistry, and properties
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…
Deformations and Stresses in Soft Body Tissues of a Sitting Person
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…
Charge-density waves and isotropic metals
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.
Preparation and structure of anhydrous zinc chloride
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…
Photoreduction and photodecarboxylation of pyruvic acid. Applications of CIDNP to mechanistic photochemistry
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…
Strength of Elastomers. A Perspective
Abstract The strength and extensibility of an elastomer depend on its overall viscoelastic properties, as reflected in the time and temperature dependence of stress-strain curves, and also on those discrete processes, including crack formation and growth, that culminate in high-speed crack propagation. The discrete pr…
Equilibrium melting of flexible linear macromolecules
Abstract The extensive literature on equilibrium melting of flexible linear macromolecules has been reviewed during the last year. The discussion in this paper is based on experiments on actual, large, extended chain crystals and extrapolations on metastable crystals. A series of 32 complete sets of melting temperatur…