Materials Literature
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Spin susceptibility measurements in crystalline alkali+ TCNQ− salts reveal the occurrence of continuous changes and first-order phase transitions in these salts, except Li+TCNQ−. A consideration of the total free energy of these distorted linear systems, in which the electronic energy results from an elementary one-di…
The zero field splitting (zfs) for porphyrin is calculated for possible transitions b2u(π), a1u(π), a2u(π) → eg(π*). Calculations are done with pi−electron orbital coefficients determined from extended Hückel calculations on the deprotonated dianion, the free base, and the acid dication. The spin dipole−dipole couplin…
The fracture modes, metallurgical and environmental influences, and suggested mechanisms of aqueous stress corrosion cracking in titanium alloys are reviewed. Many observations can be rationalised, but the task of assembling a complete quantitative model is formidable.
Molecular dynamics calculations are reported for liquid sodium chloride simulated by Born–Huggins–Mayer type pair potentials. Thermodynamic properties and self diffusion constants have been obtained for 22 VT points ranging between 1000 and 2000 K and between –1 and 14 kbars. The agreement with experimental data is, o…
Optical techniques for data storage have advanced rapidly during the last decade. Optical data storage presents many unique advantages, notably the high storage density and low access time, not attainable by conventional recording techniques. The special features of optical recording, the proposed materials and techni…
Abstract Several novel polyamides containing the N , N ′‐dialkyl‐4,4′‐dipyridinium (“viologen”) system were made by interfacial condensation of N , N ′‐bis(aminoalkyl)‐4,4,‐dipyridinium salts with di‐, tri‐, or tetrafunctional acid chlorides. These materials are useful redox polymers which turn deeply colored when red…
Pressure against composition isotherms, and changes in the relative electrical resistance with hydrogen content, have been determined over the temperature range 303–373 K, for the absorption of hydrogen by palladium alloys containing 5, 10, 15 and 20 atom % copper. For each alloy, the relative resistance increases con…
Published treatments of peel mechanics are shown to yield inconsistent relations for the dependence of peel force upon the angle of peel. The paradox is resolved by limiting the stress analyses to small bending deformations of the detaching strip in the still-attached region. This condition holds when the moment arm o…
Pd–SnO2 catalysts are more active for CO oxidation than either Pd–SiO2 or SnO2, but are relatively inactive for C2H4 hydrogenation; grinding of Pd–SiO2 and SnO2 mixtures enhances CO oxidation activity, indicating that Pd induces activity on the SnO2 surface.
On analyse les déclins de luminescence, à toutes températures comprises entre 4 et 500 K, des centres Bi3+ incorporés dans les oxydes de terres rares La2O3 et Y2O3, les métaantimoniates CaSb 2O6 et SrSb2O6 avec et sans compensation de charge, et dans l'antimoniate de terre rare Y2LuSbO7. En utilisant de plus les résul…
A matrix variational calculation has been done for electron scattering by atomic O, which includes $2{s}^{2}2{p}^{4}$, $2s2{p}^{5}$, and $2{p}^{6}$ target configurations and all possible single excitations of the $2p$ orbital. Integral and differential cross sections are reported for elastic and inelastic scattering f…
Oxidation on the 2 crystal faces of SiC platelets was studied. The oxidation of the C face followed a simple parabolic law and was oxide‐diffusion controlled, whereas that of the opposite crystal face exhibited a linear growth rate which was surface‐reaction controlled. Previous investigators, who studied the oxidatio…
Abstract
Abstract The distribution of alkali metal picrate complexes of macrocyclic polyether (dibenzo-18-crown-6) between water and benzene was investigated. The polyether-cation complexes were found to be of a 1:1 stoichiometry. The formation of 2:1 complexes was recognized for Rb and Cs in a large excess of the poiyether. T…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation R. Hasegawa, B. E. Argyle, L‐J. Tao; Temperature dependence of magnetization in amorphous Gd‐Co‐M…
Under tensile strain the inhomogeneous surface microstructure of thin polystyrene films gave rise to the formation of ∼300 Å nuclei in which large strains were localized even at the glass transition. At lower temperatures these nuclei coalesced into disk-shaped microneck zones. Fibril formation within these zones and…
A system which accomplishes high−speed, electron−stimulated Auger electron spectroscopy (AES) and x−ray photoelectron spectroscopy with a double−pass cylindrical−mirror analyzer (CMA) is described. The CMA is well suited for AES because of its very high transmission, but has found very limited use in ESCA studies. In…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible oxygenation and autoxidation of a capped porphyrin iron(II) complexJoseph Almog, Jack E. Baldwin, and Joel HuffCite this: J. Am. Chem. Soc. 1975, 97, 1, 227–228Publication Date (Print):January 1, 1975Publication History Published online1 May 2002Published inissue…
The dependence of the steady-state creep rate, εs, on stress, σ, and temperature, T, for pure copper and a two-phase copper–4.04 wt.-% cobalt alloy at 712 K can be described asFor copper, the stress exponent, n, is ∼4.8 and the activation energy for creep, Q c, is ∼ 115 kJ/mol. For the copper–cobalt alloy, n≃5 and Qc≃…
In this article we demonstrate the importance of the indirect interaction via the phonon field between pairs of defects in an amorphous material. Using only the approximate value of the lattice coupling constant it is shown that the exchange interaction is large. The most important conclusion that can be drawn from th…