Materials Literature
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Convergent beam diffraction patterns from a bcc blue-phase (I) monocrystal in an electric field applied in the [110] direction show this twofold axis transforming through an orthorhombic distortion to become, at a critical field, the fourfold axis of a tetragonal crystal. The implication on structures of blue phase I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlatinum-titanium alloy formation from high-temperature reduction of a titania-impregnated platinum catalyst: implications for strong metal-support interactionBruce C. Beard and Philip N. RossCite this: J. Phys. Chem. 1986, 90, 26, 6811–6817Publication Date (Print):December…
Very fine fibers of 3,4,9,10-perylenetetracarboxylicdianhydride heated above 520 °C in argon (Ar) or argon/hydrogen (Ar/H2) gas were grown on pressed pellets. The fibers synthesized in Ar had a rectangular cross section of about 0.1–0.4 μm on a side with lengths up to 10 mm. By contrast, the fibers synthesized in Ar/H…
We consider the motion of the flattened bubbles which form when air is injected into a viscous fluid contained in the narrow gap between two flat, parallel plates which make up a conventional Hele-Shaw cell, inclined at an angle x to the horizontal. We present a number of qualitative observations on the formation and…
The lattice expansion of Pd during the absorption of hydrogen has been investigated with a combined technique in which the length changes and hydrogen concentration were measured simultaneously and on the same sample in the single-phase region of the PdH c phase diagram above the critical point. For atomic ratios up t…
In light of our high-resolution and almost simultaneous measurements of the tilt angle and polarization in the chiral-smectic-C phase of p-(n-decyloxybenzylidene)-p-amino-(2-methylbutyl)- cinnamate (DOBAMBC), we have proposed a generalized mean-field model to describe the important features related to the smectic-A--c…
Miorocrystalline cellulose stabilized emulsions (o/w) were evaluated by means of brightfield and polarized light microscopy, freeze-etch electron microscopy, droplet size analyses and rheologic measurements. These studies indicated that miorocrystalline cellulose (Avicel RC591 ) forms a network around emulsified oil d…
We have measured the Raman spectra of bismuth sodium titanate in its rhombohedral, tetragonal, and cubic phases, with special attention paid to the phase transitions at 584K and 837K (heating). Both transitions appear to be order-disorder and strongly first order, with large thermal hysteresis. The phonon spectra at t…
The [26]porphyrin 1·2 CF3COO⊖ exhibits remarkable properties. It is formed formally by insertion of four vinyl units into the porphyrin ring. The difference between the δ values of the inner and outer protons of 1·2CF3COO⊖ is extremely large (25.3 ppm)! For comparison, the value for [18]annulenes is 12.1 Noteworthy is…
Laser Raman spectroscopy has been applied under in situ and ex situ conditions to the anodic oxide films formed on titanium at various potentials in neutral phosphate and acidic sulfate solutions. The Raman spectra reveal that the anodic oxide film is primarily composed of an anatase type of . From the relation betwee…
Abstract Durch Feststoffumsetzung aus den binären Komponenten wurden 2H‐CuScO 2 , R‐CuGaO 2 und R‐CuYO 2 erstmals dargestellt und ihre Kristallstrukturen bestimmt sowie diejenigen von R‐CuAlO 2 und 2H‐CuAlO 2 verfeinert. Charakteristische Strukturparameter (Gitterkonstanten und Bindungsabstände) werden im Hinblick auf…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetrakis(phenanthroline)di-.mu.-oxodimanganese(III,IV) tris(hexafluorophosphate).cntdot.acetonitrile and tetrakis(phenanthroline)di-.mu.-oxodimanganese(IV) tetraperchlorate.cntdot.acetonitrile: crystal structure analyses at 100 K, interpretation of disorder, and optical, mag…
The various schemes for calculating inner shells X-ray absorption spectra are reviewed and shown to be mutually equivalent. The unifying framework is provided by the multiple scattering (MS) theory. In particular the formulation based on the Green's function approach allows one under certain conditions to write the ab…
Partial discharge (PD) pulses are considered to be generated after application of overvoltage across a cavity. Their magnitude is proportional to the n-th power of overvoltage. It decreases with an increase in cavity space and moisture content. Very long time lags for PD inception, such as even a day, was confirmed. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMulticomponent polyanions. 39. Speciation in the aqueous hydrogen ion-molybdate(MoO42-)-hydrogenphosphate(HPO42-) system as deduced from a combined Emf-phosphorus-31 NMR studyLage Pettersson, Ingegaerd Andersson, and Lars Olof OehmanCite this: Inorg. Chem. 1986, 25, 26, 4726…
Effective sintering aids for SiC ceramics are discussed on the basis of their reactivities with various sintering aids around sintering temperatures (2300 to 2400 K). The free energy consideration of the reactions suggests that metals and metal oxides which do not decompose SiC in the sintering process are effective a…
A series of synthetic fused silicas of diverse OH contents was subjected to 100-keV x irradiations at 77 K and investigated by electron-spin-resonance techniques at \ensuremath{\sim}110 K or higher temperatures. Spectra were recorded at X-band frequencies (\ensuremath{\sim}9.2--9.3 GHz) both as the first derivative of…
The early-to-late stage of the spinodal decomposition (SD) of the critical mixtures of polystyrene and poly(vinyl methyl ether) was investigated by the time-resolved light scattering technique. The early stage SD where the time evolution of the fluctuations can be described, at least with a good approximation, by the…
In previous works on galvanized reinforcements in contact with Ca- containing highly alkaline media, the authors have reported the existence of a threshold pH of 13,3 ± 0,1, below which the Zn in contact with such a medium is passivated by formation of a continuous layer of calcium hydroxyzincate, but at pH values abo…
The European Concrete Board (CEB) was founded in 1957 for the purpose of developing at an international level the study of any scientific and technical subject which might further building in concrete. Among its six founding members was the Spanish professor Eduardo Torroja. From then onwards, the CEB's prestige has c…