Materials Literature
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The introduction of a phenomenological relaxation time to take collision into account in the longitudinal dielectric formulation raises some questions of principle. The author attempts to elucidate the method adopted to deal with these questions, presents a complete derivation of the RPA dielectric function by this me…
Conditions leading to surface brightening during ECM in passivating electrolytes were investigated by studying high rate transpassive nickel dissolution in acidified nitrate electrolytes under controlled hydrodynamic conditions. The experimental apparatus consisted of a flow channel cell in which constant electrolyte…
The MINDO/3 SCF MO method has been used to investigate the equilibrium geometries, electronic structure and ground state properties of ttf and tcnq and their uni- and di-valent ions. An analysis of the results indicates that both ttf+ and tcnq- have low energies of disproportionation and that electron addition or remo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCircularly polarized luminescence and energy transfer studies on carboxylic acid complexes of europium(III) and terbium(III) in solutionChun Ka Luk and F. S. RichardsonCite this: J. Am. Chem. Soc. 1975, 97, 23, 6666–6675Publication Date (Print):November 1, 1975Publication Hi…
Abstract Des mesures de RPE sur la lacune d'oxygène ayant piégé un électron (centre F + ) dans ZnO, and permis de déterminer les paramètres des interactions hyperfines magnétique et quadrupolaire électrique, avec un noyau Zn 67 adjacent à la lacune. Ceci dans les deux cas possibles de configuration: celui qui correspo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen binding to iron porphyrinsJames P. Collman, John I. Brauman, and Kenneth S. SuslickCite this: J. Am. Chem. Soc. 1975, 97, 24, 7185–7186Publication Date (Print):November 1, 1975Publication History Published online1 May 2002Published inissue 1 November 1975https://pubs.…
Symmetry rules are derived for relating the convergent-beam electron-diffraction pattern symmetries to the three-dimensional symmetry of the structure. These rules are applied to a study of 2M biotite. As a result the space group is determined as C2, or number 5 in International Tables for X-ray Crystallography, where…
Abstract β-K4SiW12O40·9H2O is orthorhombic, with the space group Pnma and a=20.62(1), b=15.57(1), c=12.95(1) Å, Dm=4.88 g cm−3 and Dx=5.04 g cm−3 for Z=4. The crystal contains a discrete β-SiW12O404− polyanion, a geometrical isomer of the α-SiW12O404− with the well known Keggin structure. The idealized Keggin ion has…
Abstract Tetraphenylporphinatoiron(III) methoxide in the high-spin state S=5⁄2 gives rise to an absorption spectrum which has been assigned to that of low-spin iron(III) porphyrins. The excited states characteristic of the spectrum of high-spin iron(III) porphyrins are the configuration-interaction admixtures of the l…
The rate of in vitro enzymatic degradation of various materials based on collagen has been determined by a novel mechanochemical method, and has been compared with the extent of degradation resulting from subcutaneous implantation in guinea pigs. In vitro data correlate well with in vivo data. It is suggested that the…
Radiative transition probabilities from 3P0, 1I6, 1D2, and 1G4 levels of Tm3+ in glasses were calculated using the matrix elements obtained by intermediate coupling scheme and experimentally obtained intensity parameters. In the absence of self-absorption of fluorescence by the glass host, the fluorescence intensities…
The structures of films of 300Å‐15μ thick formed on (100), (110), and (111)Ni crystal faces at temperatures in the range 500°–800°C were investigated by electron microscopy and x‐ray diffraction. The oxide was initially polycrystalline but rearranged as the oxide thickened to major epitaxial relationships with the met…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative chemical analysis of individual microparticles using the electron microprobe. TheoreticalJohn T. Armstrong and Peter R. BuseckCite this: Anal. Chem. 1975, 47, 13, 2178–2192Publication Date (Print):November 1, 1975Publication History Published online1 May 2002Pub…
Magnetic measurements which have been performed on single crystals of the Gd${\mathrm{Co}}_{2}$, Ho${\mathrm{Ni}}_{2}$, and Ho${\mathrm{Co}}_{2}$ Laves phases lead to a quantitative analysis of the crystal-field effects on energy and magnetization anisotropies. The anisotropy due to cobalt is negligible. Crystal-field…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBursting of soap films. VI. Effect of electrolytes and desorption on the shape of aureolesB. R. VijayendranCite this: J. Phys. Chem. 1975, 79, 23, 2501–2508Publication Date (Print):November 1, 1975Publication History Published online1 May 2002Published inissue 1 November 197…
The spectral amplitude damping of Barkhausen noise is determined theoretically and experimentally as a function of distance inside the sample itself. Power spectra for noise amplitude and its time derivative are measured in some steel specimens over a wide frequency range. Some examples of the influence of the sample…
X-ray photoelectron spectra (XPS) are obtained for Mg in MgO using high quality (purity 99.999%) Mg films prepared and oxidized under pressures of 10 -6 ~ 10 -8 torr and measured on an ESCA-36 spectrometer at a pressure of 10 -8 torr. AlKα line source was used for excitation, and the minimum of Au valence band at 5.0…
The potential hazard of occupational exposure to the radiations of 222Rn and its daughters in the natural gas industry is examined. The results of a study of 222Rn concentrations and external radiation fields in nine geographically diverse natural gas processing plants are given, and the results are interpreted in ter…
A technique for producing adherent and well-protected front surface Ag mirrors with an evaporated Al(2)O(3) + SiO(x) overcoat and an evaporated Al(2)O(3) underlayer is described. A thin Al(2)O(3) layer promotes adhesion between the Ag film and its substrate. The optimum thickness of each outer layer necessary to give…
For large reaction rate constants and negligible change in solution composition, the performance of a porous electrode with solid reactants is governed by the ohmic potential drop within the matrix and solution phases. The cell potential changes with time, at constant current, as the reactants are consumed. Equations…