Materials Literature
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Ionic and electronic conductivities, and thermoelectric power have been measured for AgI and AgI containing a dispersion of submicron size Al 2 O 3 particles. While the dispersion of Al 2 O 3 enhances the ionic conductivity significantly, it does not affect the electronic properties of the matrix. The enhancement is a…
Conference International Conference on Surface and Colloid Science, International Conference on Surface and Colloid Science, ICSCS, Surface and Colloid Science, Fourth, Jerusalem, Israel, 1981-07-05–1981-07-10 Published Online: 2009-01-01 Published in Print: 1981-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTranslational diffusion and hydrodynamic radius of unperturbed flexible chainsManfred Schmidt and Walther BurchardCite this: Macromolecules 1981, 14, 1, 210–211Publication Date (Print):January 1, 1981Publication History Published online1 May 2002Published inissue 1 January 1…
We discuss the time dependent correlation functions Sq( t) for one deuterated polymer chain, moving inside an entangled melt of chemically identical, protonated, chains. The region of interest corresponds to wave-vectors q such that D-1 >> q >> R0-1 where D is the tube diameter and R0 the overall chain size. In this r…
A series of materials containing nickel and aluminium ions has been prepared by coprecipitation with alkaline solutions, under various conditions, from solutions of the nitrates. The composition and structure of the precipitates has been examined using a number of techniques including chemical analysis, X-ray diffract…
To develop a laboratory test method for accelerating stress corrosion cracking (SCC) of steels in liquid ammonia, effects of ammonia contaminants, such as O2, N2, CO2, etc., and electro-chemical polarization on the time to failure of specimen under a constant tensile load have been studied.SCC is strongly accelerated…
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Abstract The advantages of performing coherent Raman spectroscopy with definite input and output polarizations are reviewed. Methods are described for evaluating Raman susceptibility tensor elements, depolarization ratios and nonresonant contributions to the third order nonlinear susceptibility. A systematic developme…
It appears pertinent for the opening of this review to cite the work of Ipatiew [1]. In 1901 he reported that certain metals catalyzed the decomposition of alcohols even above the melting points of the catalyst metals, However, he gave no special attention to the catalytic activity of the molten metal (liquid metal),…
The electrical conductivity and thermoelectric power of the superionic conductor Ag 3 SBr were measured in the temperature range from 293 K to 493 K. Considerable deviations from the Arrhenius law was observed in the results of the ionic conductivity. The temperature dependence of the thermoelectric power of this syst…
57 Fe and 19 Sn Mossbauer investigations of the antiferromagnetic compound FeSn are reported from 77K to well above its magnetic transition temperature. The observation of a single nuclear Zeeman pattern from 1(a) Sn sites implies that the spin ordering in the basal plane is collinear. The 57 Fe Mossbauer studies show…
A pattern of driven vortices can be observed in the shear layer created in a fluid by a rotation movement. We present such an experiment where a liquid membrane is used to close a thin experimental volume of air thus forming a wall with the following properties : — The parallel component of the fluid velocity does not…
Abstract The dependence of the first order Raman scattering efficiency of CaF 2 , SrF 2 , BaF 2 and diamond on photon energy ω L has been measured with different techniques. We find that in the visible these cross‐sections increase with ω L much faster than ω . This result has important implications as CaF 2 , for ins…
Abstract The stage dependences of the Raman spectra of potassium, rubidium and cesium graphite intercalation compounds are reported. The spectra of each set of compounds are found to be qualitatively and quantitatively consistent with the ‘nearest layer’ model for the carbon intralayer E vibrations of intercalation co…
It is shown theoretically that the superconducting state coexisting with charge-density wave (CDW, its wave vector $\stackrel{\ensuremath{\rightarrow}}{\mathrm{Q}}$) is characterized by the spatially varying periodic order parameter $\ensuremath{\Delta}(Q)$ in addition to the ordinary uniform order parameter $\ensurem…
Polished polycrystalline specimens of Si, Sic, and Si 3 N 4 were heated to high temperatures and the rate of thermal etching was measured. Grain‐boundary grooving occurred on silicon by surface diffusion, with a surface‐diffusion coefficient given by image Silicon carbide surfaces became extremely rough and very littl…
The reaction of [Au8L8](NO3)2(L = PPh3) with the phosphine scavenger [RhCl(C8H14)2]2 yields [Au8L7]-(NO3)2, X-ray analysis of which reveals the Au skeleton to be a fragment of the centred icosahedron; the cluster to be a fragment; the cluster is an intermediate in the reactions of [Au9L8]3+, and its 197 Au Mössbauer s…
The oxidative cleavage of disulphide bonds to form the sulphonic acid derivatives is shown to be an important reaction of AuX4–(X = Cl, Br) with proteins and peptides; the implications of this reaction for the toxicity of gold compounds are discussed.
Adsorption isotherms and i.r. spectra of CO2 on the perovskite-type oxide LaCoCO3 are given. Coverages at 50 mmHg are above half a monolayer. At 195 K the B.E.T. multilayer adsorption isotherm fits the data satisfactorily while at 623–673 K the Freundlich isotherm is obeyed. At lower temperatures (195–373 K) mainly ph…
A single-crystal X-ray structural investigation of the material previously known as ‘Ag2O II’ has shown the correct empirical formula to be Ag3O.