Materials Literature
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The temperature dependence of the soft mode components in BaTiO3 and KNbO3 and their contribution to the low-frequency dielectric constant are reexamined under the 1ight of recent hyper-Paman and infrared reflectivity data. Correlated fluctuations are less and less dominant with the decrease of critical dimensionality…
Abstract Morphological studies of isotactic polypropylene/low‐density polyethlene blends revealed that the shape, size, and orientation of LDPE occlusions remain undisturbed during the crystallization of IPP spherulites. On the other hand, LDPE occlusions introduce large changes in the internal structure of IPP spheru…
Study of melt rheological properties of the blends of polypropylene (PP) with styrene–ethylene butylene–styrene block copolymer (SEBS), at blending ratios 5–20% SEBS, is reported. Results illustrate the effects of (i) blend composition and (ii) shear rate or shear stress on melt viscosity and melt elasticity and the e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed-metal atom cluster compound containing silver(I) and platinum(II)Rafael Uson, Juan Fornies, Milagros Tomas, F. Albert Cotton, and Larry R. FalvelloCite this: J. Am. Chem. Soc. 1984, 106, 8, 2482–2483Publication Date (Print):April 1, 1984Publication History Published on…
The optical constants of polycrystalline electrochromic (EC) tungsten trioxide films, prepared by rf sputtering, were measured by ellipsometry at three wavelengths: 940, 633, and 546 nm. For each wavelength, the optical constants were measured at various states of coloration. It is shown that these measurements provid…
The Escherichia coli pyrC, pyrD and pyrF genes were cloned on multicopy plasmids derived from pBR322 and analysed by means of restriction endonucleases. It was found that the pyrC gene is destroyed by cutting with the restriction endonuclease BamHI, that the entire pyrD gene can be isolated on a 1300-base pairs DNA fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-encased vesiclesSteven L. Regen, Jae Sup Shin, and Kazuo YamaguchiCite this: J. Am. Chem. Soc. 1984, 106, 8, 2446–2447Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April 1984https://pubs.acs.org/doi/10.1021/ja…
A new failure mechanism resulting in open metal bit- lines was observed during reliability testing of vendor 64k dynamic random access memory (RAIM) products using sputtered Al-Si metallurgy. Life test data, physical failure analysis, and metal film characterization are presented, The observed phenomenan is not strict…
Processing characteristics, anistropic swelling, and mechanical properties of short-jute-fiber-and short-glass-fiber-reinforced styrene–butadiene rubber (SBR) composites have been studied both in the presence and absence of carbon black. Tensile and tear fracture surfaces of the composites have been studied using scan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface analysis: x-ray photoelectron spectroscopy, Auger electron spectroscopy and secondary ion mass spectrometryNoel H. Turner, Brett I. Dunlap, and Richard J. ColtonCite this: Anal. Chem. 1984, 56, 5, 373–416Publication Date (Print):April 1, 1984Publication History Publi…
Stabilization of positive charge in fluorinated ethylene propylene copolymer (Teflon FEP) is demonstrated using corona charging through a controlling grid at elevated temperatures. The extrapolated lifetime of the equivalent surface potential is 800 yr for samples charged at 150 °C and deteriorates for lower charging…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of metallocene cyclophosphazene derivativesHarry R. Allcock, Karen D. Lavin, Geoffrey H. Riding, Paul R. Suszko, and Robert R. WhittleCite this: J. Am. Chem. Soc. 1984, 106, 8, 2337–2347Publication Date (Print):April 1, 1984Publication History Publish…
Optically transparent dielectric films, when prepared by thermal evaporation or sputtering, have had limited use for many applications due to their permeability and lack of stability. We report on protective dielectric films produced by ion-beam-assisted deposition which demonstrate significant improvements over films…
Thin films (∼1 μm) of boron nitride were grown on water-cooled glass, silicon, and sapphire substrates by reactive sputter deposition from a BN target in Ar, Ar/N2, and N2 discharges. The effect of sputtering gas composition on film chemical and optical behavior is reported and discussed in the present paper. The foll…
The dielectric and thermal behaviour of deuterated betaine phosphate is similar to that of the undeuterated anti-ferroelectric material, but Tc is increased by 69 deg. In deuterated betaine arsenate, however, the low temperature phase is not ferroelectric, as in the undeuterated compound, but anti-ferroelectric.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBonding in transition-metal tetrahydroborates: a multinuclear magnetic resonance study of (C5H5)2Sc(BH4) and Sc(BH4)3 and some comments on the isolobality of BH4-, halide, and .eta.5-C5H5- groupsMary Mancini, Peter Bougeard, Robert C. Burns, Michael Mlekuz, Brian G. Sayer, J…
This paper describes how the compensation law can be explained by a linear relation between the activation entropy and enthalpy of a given process in a polymer. These two variables are related by the thermal expansion coefficient and a constant approximately equal to the Rao acoustical parameter. A relation between th…
Austenitic Fe-16 wt.% Cr-20-45 wt.% Ni alloys have been studied by electrical resistivity measurements during 21K electron irradiation and during subsequent anneals. The Frenkel-pair resistivity and the activation enthalpy for interstitial and vacancy migration have been evaluated in the 16-45 alloy. An increase in ni…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplications of topological electron-counting theory to polyhedral metal clustersBoon K. Teo, G. Longoni, and F. R. K. ChungCite this: Inorg. Chem. 1984, 23, 9, 1257–1266Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 A…
Multiple scattering theory is used to obtain a local, one-electron approximation for calculating the valence-band XPS spectra of solids and the generalisation to random substitutional alloys is described. The nature of the final state and the influence of matrix elements on the shape of the spectra are discussed. The…