Materials Literature
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MZr 4 P 6 O 24 (M=Mg, Ca, Sr, Ba), which belongs to a new, low‐thermal‐expansion family of materials known as [NZP] or [CTP], were synthesized by solid‐state reaction (oxide mixing) and sol‐gel methods, and their sinterability in two cases was investigated and compared. Thermal‐expansion measurements were made on sint…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoactivation of metal oxide surfaces: photocatalyzed oxidation of alcohols by heteropolytungstatesMarye Anne Fox, Raul Cardona, and Elizabeth GaillardCite this: J. Am. Chem. Soc. 1987, 109, 21, 6347–6354Publication Date (Print):October 1, 1987Publication History Published…
The time-dependent behavior of sidebranching deformations in the three-dimensional symmetric model of dendritic solidification is studied within a WKB approximation. Localized wave packets generated by pulses in the neighborhood of the tip are found to grow in amplitude and to spread and stretch as they move down the…
The simultaneous creep and densification of glass powder compacts was studied as a function of low applied uniaxial stress, temperature, and particle size. The creep rate can be expressed as the sum of the contribution from the applied stress that varies linearly with stress, and a contribution due to anisotropic dens…
Processing procedures and resulting mechanical properties of open-cell, low-density (relative density < 0.1) ceramic macrostructures were investigated. These macrostructures were fabricated by slurry coating reticulated polymer substrates. Cracks in the struts powder coating, which were produced during the pyrolysis o…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Abstract Hypergolic or self ignition delays of unsymmetrical dimethylhydrazine (UDMH) and several amine fuels, mixed with three fuming nitric acid oxidizers, have been determined, at room temperature, in a highly sensitive “Cup Test” apparatus. Ignition delay (ID) variations have been studied with respect to the chemi…
Results are reported of an investigation using synchrotron radiation into the effects of temperatures up to 1173 K on pressure-induced phase transitions in phosphorus. A cubic type multi-anvil press was employed and a diffraction pattern in an energy-dispersive mode was taken for a period of time, typically 200 s, wit…
Abstract Dynamic mechanical behavior and X‐ray diffraction of two series of segmented polyurethaneimides (PUI) prepared either from poly(ethylene adipate) glycol (PEA), pyromellitic dianhydride (PMDA) and 4,4′‐diphenylmethane diisocyanate (MDI), or from PEA, PMDA, and a mixture of 2,4‐ and 2,6‐tolylene diisocyanate (T…
The following side reactions occurring in the formation of polyurethanes were modeled: a reaction of excess phenyl isocyanate either with 1-butanol in 1, 4-dioxane and in bulk, or with n-butylphenyl urethane or water in dioxane catalyzed with dibutyltin dilaurate that leads to the formation of n-butyl-α, γ-diphenyl al…
The effects of low concentrations of seven different substitutional impurities on the phonon thermal conductivity of iron were determined at 300 K. Of the seven solutes, Ni caused the smallest reduction and W the greatest. The data were analyzed on the basis of Callaway’s model, and the resulting impurity scattering w…
Abstract Saponites and vermiculites may assume at least 11 ordered or semi-ordered layer stacking sequences. For a given relative humidity, the layer stacking type assumed is a function of the nature of the interlayer cation, the layer charge density, the mean size of the particles, and the di- or trioctahedral charac…
John P. Kociolek, Eugene F. Stoermer, Ultrastructure of Cymbella sinuata and its Allies (Bacillariophyceae), and Their Transfer to Reimeria, Gen. Nov., Systematic Botany, Vol. 12, No. 4 (Oct. - Dec., 1987), pp. 451-459
Effects of various elemental additives on the electrical resistivity of hot‐pressed SiC ceramics were studied. The electrical resistivity at room temperature of dense SiC ceramics varied greatly depending on the additives used. SiC ceramics with added Be had an extremely high electrical resistivity of 3 × 10 12 °.cm.…
X-ray powder diffractometry with storage-ring radiation was used to test various aspects of a method for refining simple crystal structures (Si, CeO2 and Co3O4). Excellent powder patterns were obtained with 0.17° resolution parallel slits and 1 Å X-rays. The intensities were determined with a double-Gaussian profile-f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal analysis of the conformational disorder in semicrystalline poly(vinylidene fluoride) and poly(trifluoroethylene)Kyriakos Loufakis and Bernhard WunderlichCite this: Macromolecules 1987, 20, 10, 2474–2478Publication Date (Print):October 1, 1987Publication History Publi…
Abstract The effects of chemical reduction of structural Fe 3+ in nontronite SWa-1 (ferruginous smectite) on intervalence electron transfer (IT) and magnetic exchange were investigated. Visible absorption spectra in the region 800-400 nm of a chemical reduction series of the SWa-1 nontronite revealed an IT band near 7…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical studies of transition-metal hydrides. 2. Calcium monohydride(1+) through zinc monohydride(1+)J. Bruce. Schilling, William A. Goddard, and J. L. BeauchampCite this: J. Phys. Chem. 1987, 91, 22, 5616–5623Publication Date (Print):October 1, 1987Publication History P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneral route to .mu.-hydroxo-bis(.mu.-acetato)-bridged heterometal dinuclear complexes. Syntheses, magnetic and redox properties, electronic spectra, and molecular structures of the [Cr(III)-Co(II)] and [Cr(III)-Fe(II)] speciesPhalguni Chaudhuri, Manuela Winter, Heinz Josef…
Abstract MnS thin films on glass substrates prepared by thermal vacuum evaporation show zincblende/wurtzite and rocksalt structure, respectively in dependence of the substrate temperature. The thermal‐treatment induced transition from the tetrahedrally (ZB/W) into the octahedrally (RS) coordinated phase is studied opt…