Materials Literature
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Redox potential measurements on platinum and Type 304 stainless steel in equilibrium ( or ) and nonequilibrium boric acid/lithium hydroxide solutions at 275°C are reported. For equilibrium systems containing hydrogen, good agreement was obtained between the measured potentials on platinum and calculated equilibrium po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe sense of Jahn-Teller distortions in octahedral copper(II) and other transition-metal complexesMalcolm GerlochCite this: Inorg. Chem. 1981, 20, 2, 638–640Publication Date (Print):February 1, 1981Publication History Published online1 May 2002Published inissue 1 February 19…
Molybdenum considerably reduced reversible temper embrittlement (RTE) of 12%Cr martensitic stainless steels by scavenging P in the matrix, which decreased P segregation to the grain boundaries. Contrary to the case of many low-alloy steels, Mo additions as large as 1 wt-% were still beneficial, due to the lower C cont…
The temperature dependence of the principal susceptibilities, ${\ensuremath{\chi}}_{\ensuremath{\parallel}}$ and ${\ensuremath{\chi}}_{\ensuremath{\perp}}$, of MnO are reported in the range of 4.2 to 300 K from the studies in a single crystal from which nonstoichiometries have been removed. A procedure combining selec…
The precipitation of calcium carbonate is of considerable importance in a wide variety of scale forming situations since carbonate concentrations in the environment are usually quite appreciable. As a first-formed solid phase, calcium carbonate may induce the growth of other scale minerals on its surface. Since the so…
Abstract The electrical transport properties in polycrystalline ferrous zinc ferrites, Zn x Fe 3− x O 4 ( x = 0, 0.2, 0.4, 0.6) and ferrous zinc–copper ferrites, Zn x Cu 0.1 Fe 2.9‐ x O 4 ( x = 0, 0.1, 0.2, 0.3, 0.4), are studied by measuring the conductivity and the Seebeck coefficient. The conductivity is shown to a…
SUMMARY An environmental scanning electron microscope (ESEM) has been developed which allows the examination of specimens at pressures up to 6 kPa. This new technique has been applied to the examination of live and wet plant specimens. The results are compared with those obtained using similar material that has been d…
We have carried out a computer simulation of the dynamics of a model polymer chain in solution. The polymer is represented by a nonamer linked through bonds which are constrained to be fixed (bead–rod model). All particles are assumed to interact via a Lennard-Jones potential and the simulations have been performed at…
Abstract The crystal structure of benzoic acid, C 6 H 5 CO 2 H, has been redetermined by X-ray diffraction at room temperature. Extensive neutron-diffraction measurements have also been made: by single-crystal methods at room temperature and 130 K; and, at 130 K and 5 K, by powder-profile analysis on C 6 D 5 CO 2 H. T…
Excited-state absorption in alexandrite has been measured from 420 to 680 nm by using pulsed flash lamp pumping and a dye laser probe. The excited-state absorption cross section is generally of the same order of magnitude as the ground-state absorption cross section (10−19 cm2) and therefore may represent a large loss…
Abstract Overall and detailed kinetic descriptions of the pyrolysis of C 3 H 8 have been proposed as a result of a turbulent flow reactor investigation in the temperature range of 1110–1235 K and at atmospheric pressure. The overall reaction was described by a first‐order rate expression with an activation energy of 5…
The mineral monazite, a mixed lanthanide orthophosphate $\mathrm{Ln}\mathrm{P}{\mathrm{O}}_{4}$, is considered as a perfect host for geologic disposal of actinides, rare earths, and possibly other elements formed during nuclear-reactor operation. Synthetic monazite-type orthophosphates of all the elements of the first…
<div class="htmlview paragraph">Diesel engine particulates collected on a trap cause the exhaust back pressure to increase and adversely affect fuel economy and vehicle performance. Therefore, a trap must be periodically regenerated by oxidizing the collected particulates. Several techniques for regenerating a D…
Abstract Samples of nacrite, dickite, kaolinite, and halloysite were investigated using X-band electron paramagnetic resonance (EPR) and Mössbauer spectroscopy. Fe 3+ gave rise to EPR signals at g ≃ 4 which differed with the individual polytype. Only nacrite had no resonance in this region of the spectrum, but it had…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent lanthanide chemistry. Preparation of some four- and six-coordinate bis[(trimethylsilyl)amido] complexes of europium(II). Crystal structure of bis[bis(trimethylsilyl)amido]bis(1,2-dimethoxyethane)europium(II)T. Don Tilley, Allan Zalkin, Richard A. Andersen, and David…
Nylon 6 yarns were wound at speeds varying from 700 to 5500 mpm. The effect of the winding speed on both α- and γ-type crystals in these undrawn yarns was studied. Also the effects of dry heat, tension, and heating in saturated steam were included in this investigation, since they provide useful information for drawin…
Epitaxial layers of In0.53Ga0.47As lattice matched to InP substrates have been grown by molecular beam epitaxy. The (100) InP substrate surfaces were first oxide passivated and then thermally cleaned under 1.5×10−6 Torr of arsenic moleuclar beam exposure (i.e., 1.24×1014 As4/cm2 sec). When they were heated to 500 °C,…
Electrochemical etching of Al with alternating current produces a high density of cubic etch pits covered with a film of oxide or hydroxide. Micrographs of the metal and film structures are presented and a model is proposed to explain the observations. Calculations demonstrate the feasibility of film deposition from a…
EPR and magnetic susceptibility of potassium perchromate (K3CrO8) have been studied from liquid helium temperatures to 400 K. EPR spectra of dilute aqueous solutions of K3CrO8 yielded giso=1.9712±0.0005, and 53Aiso=(18.6±0.5)×10−4 cm−1. The (positive) sign for 53Aiso, deduced here from the dependence of the linewidths…
We demonstrate the role and utility of lateral heat flow in the growth of single-crystal silicon islands on amorphous substrates. The thermal profile is varied on and around the islands by controlling the optical absorption using various thin-film structures. In this way, competitive nucleation from edges is suppresse…