Materials Literature
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Relatively low concentrations of randomly substituted off-center ions are known to induce ferroelectric order in highly polarizable crystals. In the case of potassium tantalate (${\mathrm{KTaO}}_{3}$) doped with lithium or niobium, the results of first-order Raman scattering from two hard phonon modes (${\mathrm{TO}}_…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic and mechanistic investigations of the formation of polyimides under homogeneous conditionsY. J. Kim, T. E. Glass, G. D. Lyle, and J. E. McGrathCite this: Macromolecules 1993, 26, 6, 1344–1358Publication Date (Print):March 1, 1993Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal oligo-yne polymers: electronic structures of [-(L)nMC.tplbond.CRC.tplbond.C-]x polymersGilles Frapper and Miklos KerteszCite this: Inorg. Chem. 1993, 32, 5, 732–740Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLong-range attraction between a hydrophobic surface and a polar surface is stronger than that between two hydrophobic surfacesYi Hua Tsao, D. Fennell Evans, and Haakan WennerstroemCite this: Langmuir 1993, 9, 3, 779–785Publication Date (Print):March 1, 1993Publication Histor…
Abstract It is well known that illite-smectite can form from smectite at elevated temperatures in natural and experimental systems. However, the conversion of smectite to illite-smectite is also found in some natural systems that have never been heated. The present experiments show that illite layers can form from sme…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation of x-ray crystallographic data and spectroscopic properties of divalent metal complexes of octaethylporphyrinK. D. Stanley, L. Luo, R. Lopez de la Vega, and J. M. E. QuirkeCite this: Inorg. Chem. 1993, 32, 7, 1233–1236Publication Date (Print):March 1, 1993Publica…
Owing to improved manufacturing processes technical ceramics on the basis of oxide as well as nonoxide ceramics have gained an increasing technical potential. Among other joining techniques brazing has proved to be the most flexible joining process that can easily be adapted to various ceramic-metal-combinations. In o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of linear, high-molecular-weight aromatic polyamides by the palladium-catalyzed carbonylation and condensation of aromatic diiodides, diamines, and carbon monoxideRobert J. Perry, S. Richard Turner, and Richard W. BlevinsCite this: Macromolecules 1993, 26, 7, 1509–…
In the first-order Raman spectrum of amorphous carbon (a-C) there is a low-frequency feature in the 200--900-${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ region. This feature is characteristic of the highly disordered amorphous-carbon materials. We note that the intensity of this feature is very sensitive to the thermal…
Abstract The properties of a new, very highly alloyed stainless steel, Avesta 654 SMO, are compared with those of other stainless steels and nickel‐base alloys. The new steel has a very high strength but still possesses a high elongation. The corrosion properties have been investigated in accelerated laboratory tests…
Transmission M\"ossbauer spectra at variable temperatures between 80 and 860 K have been collected for Co-substituted magnetities, ${\mathrm{Co}}_{\mathit{x}}$${\mathrm{Fe}}_{3\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{O}}_{4}$, with x=0.1, 0.2, and 0.4, and at two selected temperatures with the absorber in a longit…
Abstract In this report we present, to our knowledge, the first Raman investigations at single crystalline Ag(111), Ag(110) and microfacetted Ag(110) samples, which were exposed to N 2 or N 2 + reactive gases (oxygen and ethylene). The pressure and temperature ranges are close to those used for industrial oxidation of…
We emphasize the role of the dopant potential on the stability and magnetic properties of bipolarons in a conducting polymer. For this purpose the singlet and the triplet states of a bipolaron have been calculated within an adiabatic deformable continuum model including short-range Coulomb repulsions between electrons…
Abstract A novel process to produce microcellular PVC foams with a very homogeneous cell distribution and cell densities ranging from 10 7 to 10 9 cells/cm 3 is described. Microcellular PVC foams with relative densities (density of foam divided by the density of unfoamed polymer) ranging from 0.15 to 0.94 have been pr…
Detailed studies on the degradation reaction of electrochemically prepared polypyrrole have been conducted in an aqueous 1.0 M H 2 SO 4 solution by anodic oxidation of the polymer film at platinum electrodes, and the results are reported. The degree of degradation was followed by recording cyclic voltammograms of poly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe (.mu.-oxo)bis[trichloroferrate(III)] dianion revisitedGabriele Haselhorst, Karl Wieghardt, Stefan Keller, and Bernhard SchraderCite this: Inorg. Chem. 1993, 32, 5, 520–525Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissu…
For the radiation force acting on a small bubble in a liquid medium in the presence of a plane standing sound wave, there has been a longstanding discrepancy between the prediction of Yosioka and Kawasima [Acustica 5, 167–173 (1955)], and that of Eller [J. Acoust. Soc. Am. 43, 170–171 (1968)]. It is concluded that the…
A process is described for producing gold black films with high absorptance in the far IR. The optical and electrical properties of these films have been studied with particular emphasis on the absorptance of films at wavelengths as long as 50 microm. A substantial decrease in absorptance near50 microm has been observ…
Coexistence of the Eu 2+ and Eu 3+ centers is confirmed for two kinds of CaO : Eu phosphors prepared in N 2 and H 2 by observing electron spin resonance (ESR) spectra, photoluminescence and optical excitation spectra and luminescence decay curves. The ESR signal intensity due to Eu 2+ in CaO : Eu prepared in H 2 was a…
In this paper we describe some of the recent literature on the contact charging (also known as tribocharging and contact electrification) of organic materials. Although it is a very familiar phenomenon, much remains to be understood about the mechanism of charging with organic materials. It has been proposed that the…