Materials Literature
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Classical analysis has demonstrated that a given quantity of active material should be deposited over the thinnest layer possible in order to minimize diffusion limitations in the porous support. This conclusion may be invalid for automotive catalysis. Carbon monoxide oxidation over platinum exhibits negative order ki…
Shock-wave propagation studies along the 〈100〉 direction in LiF single crystals are presented for three elastic impact stresses, namely, 39, 29, and 15 kbar. Present results demonstrate a stress threshold for a large increase in plastic strain rate and establish stress relaxation as a bulk property. Analysis of the da…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural trends of tris(acetylacetonate)-, tris(tropolonate)-, and other tris(bidentate ligand)-metal complexes. Additional comments on the trigonal twist and ligand-ligand repulsions in octahedral D3 bidentate ligand-metal complexesA. Avdeef and J. P. FacklerCite this: In…
The surface flashover voltage over cylindrical spacers made of polyethylene in vacuum under impulse voltage application decreases monotonically with increasing temperature of the sample surface. This temperature dependence may be explained well by the mechanism that electrons injected from a cathode-insulator-vacuum j…
Abstract A sensitive technique is developed for studying the effect of As and its compounds on the permeation of hydrogen through steel membranes electrolytically charged at various pH values. Use of a rotating disc electrode permits to change pH at the cathode over a large range without changing composition of the bu…
Abstract The magnetic susceptibility of the N,N′-di-t-butyl-m-phenylenebinitroxide biradical has been measured in the temperature range from 60 to 300 K. The susceptibility follows the Curie-Weiss law, with a paramagnetic Curie constant of 0.90±0.04 K·-emu/mol and a Weiss constant of −19±2 K. This susceptibility sugge…
A simple technique has been developed which enables the examination of any uncoated insulating specimen in the scanning electron microscope at high accelerating voltages without intensity fluctuation charging artefacts. The specimens were placed in the specimen chamber which had been modified to contain a small residu…
Quantitative liquid-structure analysis using energy-scanning diffraction rather than the traditional angle-scanning diffraction is introduced. In the experimental method, white radiation and a solid-state detector are employed. This new method is inherently faster and less beset with problems of experimental instabili…
Abstract The Si/Al ratio of an hydrothermal system plays an important role in kaolinite synthesis. If the atomic Si/Al ratio of a system is greater than 2-0, kaolinite will disappear at 345 + 5°C and 2 kbars water pressure according to the reaction kaolinite + 2 quartz → pyrophyllite + H 2 O. If the atomic Si/Al ratio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular stereochemistry of (.alpha.,.gamma.-dimethyl-.alpha.,.gamma.-dihydrooctaethylporphinato)oxotitanium(IV)Patrick N. Dwyer, L. Puppe, J. W. Buchler, and W. Robert. ScheidtCite this: Inorg. Chem. 1975, 14, 8, 1782–1785Publication Date (Print):August 1, 1975Publication…
Methylcyclopentadienyl manganese tricarbonyl (MMT) has been marketed as a combustion improver for fuel oil and turbine fuel. Use concentrations for this purpose are about 0.025 g manganese/gal in fuel oil and 0.08 to 0.5 g/gal in turbine fuels. In addition, it has been used to a small extent in gasoline.
The periodate-degradation technique was used to demonstrate the mechanism by which the reducible cross-links of collagen are stabilized. In all the tissues examined, Smith degradations of the 3H-labelled cross-links indicated that dihydroxylysinonorleucine is derived solely from hydroxylysino-5-oxonorleucine, the Amad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTris(dithiocarbamato) complexes of iron(II), iron(III), and iron(IV). Electrochemical studyR. Chant, A. R. Hendrickson, R. L. Martin, and N. M. RohdeCite this: Inorg. Chem. 1975, 14, 8, 1894–1902Publication Date (Print):August 1, 1975Publication History Published online1 May…
Graham and Thornber (1974b) have proposed a mechanism for metamictization in complex niobium-tantalum oxides in which complex compositions, rather than radiation damage, are the primary requirement. This note reviews the literature in support of radiation damage as a necessary condition for metamictization and suggest…
The electrochemical conditions within cracks in metals undergoing cathodic hydrogen charging in acid solutions are analyzed. The gradients of the electrical potential and concentrations of the various ionic species and the current distribution are calculated for a model crack. The actual potential profiles were measur…
Abstract The density of crystals of poly(ethylene terephthalate), (PETP), Q c is checked by X‐ray diffraction assuming a triclinic unit cell and the indices of reflections as found by Bunn. The following unit cell dimensions are found: a = 4,48Å, b = 5,85Å, c = 10,75 Å, α = 99,5°, β = 118,4°, and γ = 111,2°. This give…
The orthorhombic unit cell of Cu 4 Bi 4 S 9 crystals has dimensions: a = 11.589(5), b = 32.05(1), c = 3.951(5) Å; space group Pbnm , and Z = 4. The structure, which has been determined with the symbolic addition procedure, contains, sulfur-sulfur bonds in a form of S 2 groups, as predicted from the valence rule with S…
Investigation of soils from Devon and King Christian Islands show frost processes as having a dominating influence upon microfabric characteristics. Frost processes are expressed in the various modifications of banded fabric observed in the soils, and fine-grained cappings on framework members. While soils from Devon…
Direct reflectance measurements have been carried out on thin solid guanine films over a range of photon energies extending from 2 to 82 eV. Over this range these measurements, along with a Kramers-Kronig analysis, yield the complex refractive index n, the complex dielectric function e, and the energy loss function $-…
Colourless needles of the compound CsGaS 2 were obtained by the reaction of cesium carbonate with gallium oxide at 850°C under a stream of H 2 S. Structural investigations of (100) twinned crystals revealed an atomic arrangement isotypical with RbFeS 2 . Space group C2/c; a = 7.425(6) Å, b = 12.21(1) Å, c = 5.907(6) Å…