Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new model of structure and bonding in the boron hydridesA. J. Stone and M. J. AldertonCite this: Inorg. Chem. 1982, 21, 6, 2297–2302Publication Date (Print):June 1, 1982Publication History Published online1 May 2002Published inissue 1 June 1982https://doi.org/10.1021/ic001…
A series of three single-particle detectors for the detection of ions with keV energies has been built and investigated by experiment and by computer simulation. The incident ions hit a converter electrode and produce secondary electrons which are accelerated onto the funnel of a channel electron multiplier (CEM). Exp…
The viscosity of a soda-lime silica glass was measured at high strain rates. The data show non-Newtonian viscous flow in this inorganic oxide glass with the viscosity values below the expected Newtonian value. Following the imposition of large, steady strain rates, the observed stress increases with time to a maximum…
The behavior of unstable regions in the composition plane for III–V quaternary solid solutions made from among Al, Ga, In, P, As and Sb is analyzed, based on the strictly regular solution approximation for solid solutions. Temperature dependences of spinodal isotherms at 400–1000°C show that unstable regions cover a w…
The electronic structures of the Heusler alloys Co 2 MnSn, Co 2 TiSn and Co 2 TiAl are calculated using the SAPW method. The common properties and characteristics of these three alloys are seen in their band structures. Whether or not the orbital angular momentum is quenched in the three alloys is discussed on the bas…
The stimulated emission cross sections of rare-earth transitions depend strongly on the host. The properties that influence the cross sections—line strength, linewidth, and refractive index—are reviewed, and rules for tailoring cross sections are discussed. To illustrate the application of these rules, the largest sti…
The day fractions of nine New Zealand soils and an andesitic pumice, separated using minimal prctreatment, were examined by infrared spectroscopy (IR) and by dissolution in acid oxalate and pyrophosphate reapnts. Allophane, with an Al/Si ratio dose to 2/1, was prcsent in most samples and was estimated quantitatively f…
The unreacted methacrylate groups on the surface of conventional composites and microfilled composites were studied by means of multiple internal reflection infrared spectroscopy. The influences of polymerization time, temperature, and the effect of polishing were studied. We also attempted to relate the results of so…
Abstract A layered double hydroxide with a chemical composition [Al 2 Li(OH) 6 ] + X − · nH 2 O, where X − is an interlayer anion, has been synthesized hydrothermally at 130°C from aluminum-tri-(sec-butoxide) and lithium carbonate. Electron micrographs showed the product to have a platy morphology with distinct hexago…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCeria-promoted three-way catalysts for auto exhaust emission controlGwan KimCite this: Ind. Eng. Chem. Prod. Res. Dev. 1982, 21, 2, 267–274Publication Date (Print):June 1, 1982Publication History Published online1 May 2002Published inissue 1 June 1982https://pubs.acs.org/doi…
Experimentally we present high-resolution ac calorimetry measurements on a liquid-crystal compound exhibiting a smectic-$A$---smectic-$C$ ($\mathrm{Sm}A\ensuremath{-}\mathrm{Sm}C$) phase transition which is shown to be mean-field-like. In the light of this experimental result, a simple and convincing argument, based o…
Pressureless sintering of SiC was accomplished at 2100°C with oxide additives. These additives were the products of the reaction of Al(OH) 3 with HCl and of Y(OH) 3 with HCOOH. These reaction products were dissolved in water and mixed with submicrometer β‐SiC. A mixture of equal weights of these additives was effectiv…
Nonplanar silicon surfaces were prepared and oxidized at 900°–1100°C and the oxide morphology was studied by transmission electron microscopy of thin sections. A 30% decrease in oxide thickness at silicon step edges following 900° and 950°C wet oxidation is attributed to the effect of locally compressive intrinsic str…
During fracture of ceramics containing tetragonal zirconia particles, a volume of zirconia material on either side of the crack irreversibly transforms to the monoclinic crystal structure. Transformation zone sizes, measured using Raman microprobe spectroscopy, are presented for three sintered ceramics. In a single‐ph…
We consider capillary displacement of immiscible fluids in porous media in the limit of vanishing flow rate. The motion is represented as a stepwise Monte Carlo process on a finite two-dimensional random lattice, where at each step the fluid interface moves through the lattice link where the displacing force is larges…
This paper describes the chemical and mineralogical characteristics which must show the blas-furnace slags to be used in cement manufacture or to be added to concrete. There are also shown technical and economical details concerning manufacture and use of blast-furnace slag cements. Methods to control the quality of s…
In the field of energy saving, mainly thermic, in the cement industry, not only should we consider the possibilities in the technological process or the finished product, but also the influence of the chemical-mineral composition of the raw materials. The distinct parameters which fall into the reactivity of the crude…
This paper shows some deficiences of the Spanish Standard Method UNE 7245 and the corresponding deficiences of the Spanish Concrete Code EH-SO adopting it. According to the actual Method, erroneous low values may result in determining sulphides and in general sulphur compounds in cocrete aggregates. Attention is drawn…
In this work, a continuation of others, DRX studies the evolution of the structural characteristics of the enriched fraction (hydrated-attacked cement) extracted from one of the mortar prisms (1:3) o/ 1 x 1 x 6 cm of the different series manufactured with Portland cement of initial high resistance and with mixtures of…
The different forms of superficial alteration that appear on the stones of the Oviedo Cathedral are described and localed, in this part of the paper. The more common phenomena of deterioration of the monument are also defined, stressing on the crusts.