Materials Literature
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The effect of impurities on the critical interaction strength for the Mott transition has been investigated using an extension of the Gutzwiller approach to correlation in the metallic state. It is shown that the band narrowing due to impurities causes a reduction of the effective interaction necessary for the transit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of tetra-n-propylporphine. Average structure for the free base macrocycle from three independent determinationsPenelope W. Codding and A. TulinskyCite this: J. Am. Chem. Soc. 1972, 94, 12, 4151–4157Publication Date (Print):June 1, 1972Publication History Published…
The normal spinel Fe[Cr 2 ]S 4 has been studied using the Mössbauer effect. Spectra have been collected over the temperature range 2–500 °K. Results are presented for the quantity [Formula: see text], the hyperfine field, and the isomer shift. We find that the magnetically split spectra can be fitted using a zero valu…
Abstract The synthesis and general physical characteristics of the perfluoroalkylene‐linked aromatic polyimides have been discussed in Part I. In this paper the hydrolytic, oxidative, and thermal stabilities of these polymers are compared with those of certain wholly aromatic polyimides. Comparative studies are also m…
Abstract Phosphatization of limestones on the Agulhas Bank, southern tip of Africa
Abstract As to the modes of inhibiting electrode processes, it belongs to the present tasks of the Working Party “Inhibitors” of the European Federation Corrosion first to elaborate valid formulations in definition, nomenclature and classification and second to present a review on methodology for investigating inhibit…
Abstract This paper describes the preparation of a series of novel perfluoroalkylene‐ and ether‐linked aromatic polyimides. Depending on the nature of the precursor diamine, the polyimides were prepared by either melt or solution techniques, the latter via the corresponding poly(amic acids). The polymers were characte…
The paramagnetic resonance spectrum of the iron oxygen-vacancy (${\mathrm{Fe}}^{3+}\ensuremath{-}{V}_{o}$) pair in the tetragonal $\frac{I4}{\mathrm{mcm}}$ phase of SrTi${\mathrm{O}}_{3}$ at 78 \ifmmode^\circ\else\textdegree\fi{}K is analyzed in detail. The spectra observed at $K$ band are fully accounted for using th…
Grain boundary sliding is necessary during diffusion creep to maintain continuity across the grain boundaries. In this paper it is shown, by use of a two-dimensional hexagonal array, that grain boundary sliding will contribute additional axial strain to the specimen as predicted by R. N. Stevens (1971). It is shown, h…
The X-ray patterns of two new smectic modifications (smectic D and Smectic E) are investigated. The D-modification is potically isotropic. A cubic structure is presumed. In the E-modification the pattern exhibits three sharp outer rings besides the inner irng, which points to a higher order compared withthe A, B and C…
Abstract Use of microprobe in analyzing mineralogical-textural relationships in fine-grained materials not readily studied by optical methods
Domain spacing in SmCo5 is observed to increase by a factor of 1.5 at 78 K as compared with the spacing at room temperature. This indicates a difference in domain wall energy, which may explain the experimentally found difference in coercive force.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, stereochemistry, and mechanism of formation of mixed bis(dithiolato)nickel dimersAlvin Hermann and Richard M. WingCite this: Inorg. Chem. 1972, 11, 6, 1415–1420Publication Date (Print):June 1, 1972Publication History Published online1 May 2002Published inissue 1 J…
The N(z) distribution, the Wilson ratio and variance values have been determined for the case of twinned crystals where non-equivalent reflexions coincide exactly. The results have been applied to a practical example. The structural reasons for twinning may require that only reflexions occurring at relatively large Br…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions and Technological Properties of Sulfur-Treated AsphaltUgo Petrossi, P. L. Bocca, and Pierpaolo PacorCite this: Ind. Eng. Chem. Prod. Res. Dev. 1972, 11, 2, 214–219Publication Date (Print):June 1, 1972Publication History Published online1 May 2002Published inissue 1…
Masao Kiyama, Toshio Takada; Iron Compounds Formed by the Aerial Oxidation of Ferrous Salt Solutions, Bulletin of the Chemical Society of Japan, Volume 45,
Abstract Detailed studies of the fusion of natural rubber, following isothermal crystallization, has revealed a hitherto undetected low temperature transition which depends on the crystallization temperature. This transition is shown to be a melting phenomenon which is not caused by any polymorphic structural changes.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of a d7 iron system. Tetraphenylporphineiron(I) anionIrwin A. Cohen, David Ostfeld, and Barry LichtensteinCite this: J. Am. Chem. Soc. 1972, 94, 13, 4522–4525Publication Date (Print):June 1, 1972Publication History Published online1 May 2002Published inissue…
Summary A kinetic method is described and investigated for determining exchangeable Al in acid soils using M NH 4 Cl solutions the pH and leaching rate of which was critical for obtaining accurate and reproducible values. Molar concentrations of ammonium acetate displaced at least part of the Al chelated to functional…
"Thermal Analysis of Pressurized Water Reactors." Nuclear Science and Engineering, 48(2), p. 233