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In this paper a presentation is given of some of the basic physics of the soft-mode ferroelectric effect, along with its experimental background. Further, possible applications in electrooptic devices are elucidated. A fast (sub-microsecond) electrooptic switching can be achieved in the A* phase, and in similar orthog…
A one-sided diffusion-limited model for dendritic growth in two dimensions is simulated numerically by means of a Green's function in quasistationary approximation. Anisotropy in the surface tension is found necessary for dendritic growth. Scaling behavior of the growth rate and tip radius is found as function of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of the changes in the properties of silica cage along the gel/xerogel transition on the photochromic behavior of trapped spiropyransDavid Levy and David AvnirCite this: J. Phys. Chem. 1988, 92, 16, 4734–4738Publication Date (Print):August 1, 1988Publication History P…
Six new pyrazine-bridged complexes of iron(II) have been prepared and studied using magnetic susceptibility, differential scanning calorimetry, and vibrational, electronic, and Mössbauer spectroscopic methods. Fe(pyz)(CF 3 SO 3 ) 2 exhibits a susceptibility maximum at 4.4 K and analysis of the magnetic data according…
A [3]radialene having strong electron-donor properties, the title compound 1, was formed upon reaction of lithium thioxanthenide with hexachlorocyclopropane after addition of BuLi. Cyclic voltammetry in CH2Cl2 gave two pairs of reversible waves corresponding to the formation of 1⊙⊕ and 12⊕. A thermally accessible trip…
The densification behavior of Al 2 O 3 ‐MgO (0.1 wt%) has been studied in O 2 and N 2 atmospheres. Powder compacts have been sintered at 1600°C for 0.5 to 8 h. For some specimens the sintering atmosphere has been changed after 30 min of sintering. Irrespective of sintering atmosphere, sintered densities are approximat…
Design principles and initial results are presented for a magnetic bottle electron spectrometer of high collection efficiency (2π sr) and good energy resolution. The instrument duplicates the carefully shaped axially decreasing magnetic field configuration of Kruit and Read [J. Phys. E 16, 313 (1983)], but replaces th…
Abstract Cs 3 Cu 2 I 5 und Rb [Cu 2 I 3 ] werden durch Umsetzung von CsI bzw. RbI mit CuI in Lösung (Acetonitril bzw. Aceton) oder durch Festkörperreaktion hergestellt. Die Kristallstrukturanalyse von Cs 3 Cu 2 I 5 (orthorhombisch, Pbnm, a = 1438,6(6), b = 1014,7(5), c = 1167,5(5) pm, Z = 4) ergab, daß diese Verbindun…
The synthesis of a new discotic mesogen, 2,3,7,8,12,13-hexa(octadecanoyloxy)-truxene is reported. This new compound has been studied using polarization microscopy, differential scanning calorimetry, small angle X-ray scattering and adiabatic calorimetry. The results are compared with those of two other truxene derivat…
The phase equilibria in the system zirconia‐hafnia‐yttria were investigated at 1300° and 1600°C by precise lattice parameter measurements and the direct phase‐inspection method. Large fluorite solid solution regions were dominant at both investigated temperatures. The extent of ordering within the ternary system was s…
In order to investigate the thermodynamic properties of alkali feldspars, three new feldspar ion-exchange series have been synthesized, two based on monoclinic parent materials having intermediate degrees of Al—Si order, the other on Amelia low albite. Acid solution calorimetric measurements have been carried out in 2…
Conductive (150 μΩ cm), adherent films of zirconium and hafnium borides have been deposited on various substrates by the low-temperature (100–270 °C) thermal decomposition of Zr[BH4]4 and Hf[BH4]4. Auger electron spectroscopy of these films shows that their composition is ZrB2 and HfB2. The film surfaces are oxidized…
Monomer concentration fluctuations in high molecular weight polymer blends are investigated. The fluctuations reduce the value of the χ interaction term in the Flory–Huggins free energy by a factor of (1-6/π2) and add a concentration and molecular weight contribution which decreases phase stability for off-critical co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonmetal redox kinetics: oxidation of iodide by hypochlorous acid and by nitrogen trichloride measured by the pulsed-accelerated-flow methodJulius C. Nagy, Krishan Kumar, and Dale W. MargerumCite this: Inorg. Chem. 1988, 27, 16, 2773–2780Publication Date (Print):August 1, 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared characteristic absorption bands of highly isotactic poly(acrylonitrile)Masatomo Minagawa, Kazuyuki Miyano, Masahiko Takahashi, and Fumio YoshiiCite this: Macromolecules 1988, 21, 8, 2387–2391Publication Date (Print):August 1, 1988Publication History Published online…
Author Institution: Department of Chemistry, University of Virginia
Abstract A kaolinite-polymer intercalation complex was apparently formed for the first time by the polymerization of acrylonitrile between the kaolinite layers. A kaolinite-ammonium acetate intercalation complex was dispersed in acrylonitrile monomer. The monomer was apparently incorporated between the layers by displ…
The calculation of orientation factors determining the anisotropy of dislocation-induced broadening of X-ray diffraction lines in crystals is treated for elastically anisotropic materials in terms of a general formalism. The application of the procedure is demonstrated by representation of a computer program and numer…
The application of scaling laws to fiber composite laminates is discussed. Particular emphasis is placed on the case of impact loading. Scaling difficulties and conflicts are identified and illustrated in an experimental program based on impacted carbon-fiber composite beams. It is shown that the lay-up of laminates i…
Abstract An analysis of the Gordon‐Taylor equation shows that its background is based on additivity. The corresponding parameter K = ρ 1 Δα 2 / (ρ 2 Δα 1 ), however, may include also an interaction contribution if the quadratic concentration term is neglected in a virial‐like extension of the glass transition temperat…