Materials Literature
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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…
We describe and classify optical textures observed in thermotropic liquid crystal polymers at elevated temperatures. The evolution from the static state to different textures observed as a consequence of controlled shearing experiments is reported together with the subsequent relaxation behaviour at the cessation of f…
The photoemission derived electron binding energies (with respect to the Fermi level) of xenon atoms adsorbed on nonuniform metal surfaces are found to be sensitive to the local work function of the respective adsorption site. As a consequence separated photoemission lines can be resolved corresponding to xenon atoms…
To characterize the intrinsic adhesion properties of various metal–polyimide systems we have used x-ray photoelectron spectroscopy (XPS) to monitor interfacial reactions during metallization of cured polyimide at room temperature. In situ measurements were made in a UHV system when monolayers and submonolayers of Cr,…
Photoemission and inverse photoemission (or bremsstrahlung spectroscopy) are shown to be complementary techniques for probing occupied and unoccupied electronic states, respectively. The momentum of delocalized valence states can be measured as well as their energy if low electron (photon) energies in the 10–40 eV ran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactive foams for air purificationSusann M. Brander, Gudrun I. Johansson, Bengt G. Kronberg, and Per J. SteniusCite this: Environ. Sci. Technol. 1984, 18, 4, 224–230Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April…
The X-ray diffraction analysis of 75 thin volcanic clay bands in the Lower Cretaceous of the Peace River coalfield shows kaolinite and mixed-layer illite–smectite to be the two clay minerals present. Kaolinite is dominant in the clay bands (tonsteins) in the coal-bearing Gething and Gates formations, whereas illite–sm…
A methodology for predicting the expected combined stochastic radiobiological effects of sequential exposure to different ionizing radiations is used to arrive at a methodology for predicting the radiobiological effects of simultaneous exposure. Both methodologies require developing additive-damage dose-effect models.…
The feasibility of using polarized deuterium (D) and tritium (T) plasmas in fusion reactors may be seriously affected by recycling in material walls. Theoretical and experimental results are reviewed which show how the depolarization rates of absorbed D and T depend on first wall parameters such as the temperature, th…
Abstract A method is described for the quantitative analysis of bulk specimens without standards by using peak‐to‐local background ratios in energy‐dispersive electron probe microanalysis. Theoretical transport investigations have been used to derive an expression for the absolute determination of ( P / B ) ratios. Ac…
Abstract Single crystals of LaOCl have been grown from molten LaCl 3 by a slow cooling technique. The Raman spectra of these crystals have been recorded and the frequencies and symmetries of the different lines determined by means of polarized Raman scattering.