Materials Literature
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Abstract This paper points out that interpretations from stress changes alone during oriented crystallization have led to widely different proposed chain conformations and consequently very different crystallization mechanisms for strain‐induced crystallization (SIC). Many of the proposals, including the one by Keller…
The filamentary growths of single crystals on material surfaces are termed whiskers. They are seen to nucleate and grow on certain electronic materials either from vapour and liquid phases or by a process induced by residual stresses in electroplated surfaces. Whisker growth does not depend on the existence of an elec…
Abstract Electron paramagnetic resonance in anisotropic magnets is analyzed. The resonance field at fixed frequency is shown to be a function of the principal values of the external susceptibility tensor and hence can be temperature dependent. The predictions of the theory are compared with data on the temperature dep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUtility of virtual coupling in the carbon-13 {proton} nuclear magnetic resonance spectra of bis-phosphite complexes of palladium and platium. Algebraic cancellation of spin-spin couplingA. W. Verstuyft, J. H. Nelson, and L. W. CaryCite this: Inorg. Chem. 1976, 15, 3, 732–734…
The solid-state polymerization of S2N2 to (SN)x is investigated as it relates to the molecular, crystallographic, and defect structures of this superconducting polymer. The least motion principle predicts that polymerization should occur by a nonunique reaction to form cis–trans polymer chains normal to the 21 axis of…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Cryptates in Anionic Polymerization of LactonesA. Deffieux and S. BoileauCite this: Macromolecules 1976, 9, 2, 369–371Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https://pubs.acs.org/doi/10.1021/ma6…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Morphology of Directionally Solidified Poly(ethylene oxide) SpherulitesAndrew J. Lovinger and Carl C. GryteCite this: Macromolecules 1976, 9, 2, 247–253Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerric tris(dithiocarbamate) spin equilibrium revisited. Variable-temperature (4.2-296.deg.K) magnetic susceptibility, (30-300.deg.K) infrared, and (4.2-85.deg.K) electron paramagnetic resonance dataGretchen R. Hall and David N. HendricksonCite this: Inorg. Chem. 1976, 15, 3…
Abstract Thermally stimulated and isothermal depolarization currents of three low‐density polyethylenes are investigated in the temperature range 80–320°K. The thermally stimulated current spectra can be analyzed in terms of a continuous relaxation time spectrum. This spectrum can be resolved into three Gaussian distr…
Abstract The crystal structure of poly( m ‐phenyulene isophthalamide) was determined by x‐ray analysis. The triclinic cell, with a = 5.27 Å, b = 5.25 Å, c (fiber axis) = 11.3 Å, α = 111.5°, β = 111.4° and γ = 88.0° and space group P 1, contains one monomeric unit. The crystal density is 1.47 g/cc. The molecules in the…
An energy-dispersive x-ray method for a rapid analysis of the broadening of diffraction lines in powder patterns has been developed. Experimental results are given for magnetite powders with sizes in the range 50–200 Å and compared with the results of standard angle-dispersive diffractometry and electron microscopy. T…
The room‐temperature mixed‐mode fracture of commercial hot‐pressed Si 3 N 4 was examined using controlled surface flaws in 4‐point bending, oriented at various angles 6 with respect to the outer fiber tensile stress direction. Catastrophic fracture paths were non‐coplanar with the initial flaw plane, and the stress in…
Free electrolyte was removed by ion exchange from monodisperse polystyrene latex. Non-Newtonian viscosities were measured at volume fractions from 0.05 to 0.50, at various electrolyte concentrations. Electrolytes included HCl, K2SO4, MgSO4, Al2(SO)4)3, and Th(NO3)4. Deionized latices exhibited yield stresses τ0 which…
An electron-spin-resonance (ESR) study has been carried out on γ-ray-induced color centers in a pure-SiO2-core B2O3⋅3SiO2-clad prototype optical fiber and in bulk glasses of the core and cladding compositions. Defects in the core material included the familiar silicon E′ center and other centers tentatively attributed…
Heat capacities of a series of mixed‐alkali glasses of composition (in mol%) 24.4(Na 2 O + K 2 O)‐75.6SiO 2 were measured in the transition region by differential scanning calorimetry. The glass heat capacities at 700 K and the equilibrium liquid heat capacities are the same for all glasses on a per‐g atom basis and e…
<P>Abstract copyright UK Data Service and data collection copyright owner.</P>The Scottish Young People Survey (SYPS), a cohort series, began in 1984, subsuming the Scottish Qualified School Leavers Surveys, (GN 33237). It is a postal survey in which questionnaires are initially sent to young people approximately nine…
Hole trapping in thermally grown silicon-dioxide films has been studied using optically induced hot-hole injection in p-channel polysilicon-SiO2-silicon field-effect-transistor structures. Analysis of the data assuming a uniform trap distribution and no detrapping gives 3.1×10−13 cm2 and 1.4×1018 cm−3 for the capture…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrosylmetalloporphyrins. III. Synthesis and molecular stereochemistry of nitrosyl-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinato(1-methylimidazole)iron(II)W. Robert Scheidt and Paul L. PiciuloCite this: J. Am. Chem. Soc. 1976, 98, 7, 1913–1919Publication Date (Print)…
New measurements of the optical spectrum of trivalent neodymium in a hexagonal lanthanum chloride host have been made at 4 and 77 K at wavelengths down to 2500 Å (40 000 cm−1). Crystal quantum number assignments for new energy levels were derived from these results and for most of the earlier levels not already classi…