Materials Literature
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Differential magnetic susceptibility data for ${\mathrm{CoCl}}_{2}$-GIC's (graphite intercalation compounds) are analyzed using the high-temperature series expansion of the classical spin model in two dimensions. On this basis, conclusive evidence for a classical two-dimensional (2D) XY model description of the magnet…
Abstract The energy loss of protons in the energy region from 40 to 350 keV is measured for (110), (100), and (111) planar channeling, for 〈110〉, 〈111〉, 〈112〉 axial channeling, and for random directions in silicon. The investigations are carried out by means of the transmission experiment using silicon targets of seve…
Shapes of cracks associated with Vickers indenter flaws in a glass‐ceramic were assessed by stepwise polishing and measuring surface traces as a function of depth. The cracks were of the Palmqvist type even at200‐N indentation load. The toad dependence of crack lengths and fracture toughness estimates were examined in…
Failure of the insulation in distribution- class metalclad switchgear may release large amounts of energy resulting in an explosive hazard to adjacent equipment and personnel. Many such failures have occurred in older outdoor and generating station switchgear within Ontario Hydro. The failures have often been caused b…
The various mechanisms of relaxation of rare earths in glasses are outlined. Examples are given for radiative transfer as a means of increasing pumping efficiencies. Nonradiative relaxation of rare earths in oxide and fluoride glasses follow an exponential law when two glass former phonons are subtracted. Cross-relaxa…
Abstract A study of signal‐to‐noise ( S / N ) was made in a Kratos ES300 XPS system on a variety of materials using both monochromatic and conventional X‐ray sources covering a wide range of count rates. Equations relating S / N to total counts ( S + B ), background ( B ), and the signal‐to‐background ( S / B ) ratio…
Changes in the distribution of anodic sites on steel and aluminum surfaces have been monitored by applying a pH-indicating dye and observing how the color pattern on the surface changes as cathodic protection is applied. In addition, cathodic polarization curves for steel in seawater have been correlated with 120-day…
Inhibition of fluid flow instabilities in the melt by the axial magnetic field in Czochralski silicon crystal growth (AMCZ) is investigated precisely by a high-sensitivity striation etch in conjunction with temperature measurements. The magnetic field strength (B) was varied up to 4.0 kG, incremented mostly in 0.5-kG/…
Summary Acid corrosion inhibitors provide protection by adsorbing on metal surfaces, thus forming a barrier against acid attack. On entering the formation, the inhibitor strongly adsorbs on clays and other minerals present within the matrix of the rock. In some cases. inhibitors contain acid-insoluble residues that ca…
A recent method for predicting light scattering by random aggregates of particles is experimentally examined. This approximate method is here tested in terms of its ability to predict the effects of aggregation of latex spheres of five different sizes on nine different transmitted and scattered light fluxes. In each c…
Les structures cristallographiques de la L-asparagine monohydratee et de la solution solide (0,85-0,15) L-asparagine-acide L-aspartique monohydrate sont affinees en utilisant des donnees RX a 103 K. Les positions atomiques des groupes CONM 2 (asparagine) et CO 2 H (acide aspartique) ont ete determinees par le processu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and reactivity of the hydroxymethyl complex of rhodium octaethylporphyrinSeth L. Van Voorhees and Bradford B. WaylandCite this: Organometallics 1985, 4, 10, 1887–1888Publication Date (Print):October 1, 1985Publication History Published online1 May 2002Published ini…
The extent of surface destabilization of weight percent ceramic disks was determined after exposure to molten salt mixtures of sodium sulfate containing up to 15 mole percent sodium metavanadate at 1173 K. The ceramic surface was observed to transform from the cubic/tetragonal to the monoclinic phase, concurrent with…
Abstract The molar masses of linear polyesters formed in the polymerization of stoichiometric mixtures of 1,7‐heptanedicarboxylic acid ( 4 ) with 2,2‐bis[4‐(2,3‐epoxypropoxy)phenyl]propane ( 2 ) (the diglycidyl ether of Bisphenol A), and of 1,2‐cyclohexanedicarboxylic anhydride ( 3 ) with 2,3‐epoxypropyl phenyl ether…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilane inversion catalyzed by weak nucleophiles: pseudorotation of 10-Si-5 intermediatesWilliam H. Stevenson III and J. C. MartinCite this: J. Am. Chem. Soc. 1985, 107, 22, 6352–6358Publication Date (Print):October 1, 1985Publication History Published online1 May 2002Publish…
Zwei Klassen paramagnetischer Mangankomplexe können ESR‐spektroskopisch unterschieden werden: Radikalkomplexe 1 , in denen Radikalanion‐Liganden L⊙⊕ durch Cp(CO) 2 Mn 1 ‐Fragmente stabilisiert sind, und low‐spin‐Mn II ‐Verbindungen 2 mit stark nucleophilen Liganden L.
Effective-medium theory (EMT) results for the behavior of the elastic properties of random-central-force networks with a fraction p of nearest-neighbor bonds present are extended to finite frequencies. Good agreement with numerical simulations for the density of states at all frequencies is demonstrated. In particular…
Recent investigations into metal powder fabrication by chemical precipitation techniques have shown that a wide variety of powder morphologies can be obtained by making subtle changes in the reaction parameters. Palladium powders produced using these techniques find wide application in the microelectronics industry, p…
Abstract The occurrence of palygorskite in some Tertiary sediments in eastern Saudi Arabia was studied. Mineralogical and chemical analyses were made of samples from two sections several meters thick from the Umm er Radhuma and Dammam Formations of Paleocene and Eocene periods, respectively. Layers of shales were obse…
Lead fluorosilicate glasses containing up to 25 mol% PbF 2 were prepared. The dc electrical conductivity, thermal expansion, and transformation‐range viscosity of these glasses indicate that they are anionic conductors and that fluorine significantly decreases the continuity of the vitreous network.