Materials Literature
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Diamond particles were dispersed in silicon nitride, sintered at 6 GPa and 1600°C for 30 min, and heat‐treated under vacuum at 1300°C to induce graphitization of the diamond. Improved fracture toughness values up to 7.5 MN/m 312 were achieved for these composites. Stress‐induced microcrack toughening is considered to…
Abstract Chemical preparation and crystal structure of Pb 2 Cs 3 (P 4 O 12 )(PO 3 ) 3 are described. The triclinic unit cell has the following dimensions: equation image space group is P 1 with Z = 2. The crystal structure has been solved by using 3350 unique reflexions with a final R value 0.048, The main outstanding…
Abstract The Raman spectra of pure silica core fibres revealed the presence of molecular oxygen, which may be responsible for two absorption bands, one at 0.76 and the other at 1.27 μm.
Electrolytic, chilled mirror, and aluminum oxide dielectric hygrometers were evaluated by exposing them to known moisture levels in gaseous argon. The experiments were performed over a period of several months to determine the long-term hysteresis effects which may occur under continuous operation in the range of 1 to…
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.