Materials Literature
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The reorientational dynamics within the rotationally disordered cubic plastic phase of solid ethanol is investigated by means of the concurrent use of computer molecular dynamics and quasielastic neutron scattering. Motions involving widely different time scales are shown to take place above the calorimetric ``glass t…
Piezoelectric Pb[(Zn 1/3 Nb 2/3 ) 0.91 Ti 0.09 ]O 3 (PZNT 91/9) single crystals with diameters of 40 mm were successfully grown from solution by the Bridgman method with a PbO flux supported on the bottom of the crucible. This type of Bridgman method is more suitable for growing large and heavy crystals than the hangi…
We report high-resolution measurements of the coefficient of thermal expansion, $\ensuremath{\alpha}{=l}^{\ensuremath{-}1}\ifmmode\times\else\texttimes\fi{}(\ensuremath{\partial}l/\ensuremath{\partial}T),$ on single crystals of the organic superconductors ${\ensuremath{\beta}}^{\ensuremath{''}}\ensuremath{-}{(\mathrm{…
An advanced process for the synthesis of polyphosphazenes with controlled architectures has been investigated. By this method, a wide range of well-defined phosphazene di- and triblock copolymers with controlled molecular weights and narrow polydispersities have been synthesized ( M n up to 4.8 × 10 4 with polydispers…
Cubic CuFe2O4 was prepared by coprecipitation in a polymer matrix. Crystallite size and particle size of the prepared samples, determined from x-ray data and transmission electron microscopy analyses respectively, are in the range of nanocrystalline materials. Cation distribution of the nanocrystalline samples was det…
Magnetization, resistance, and current–voltage (I–V) measurements have been performed in La0.5Sr0.5MnO3 compact prepared by pressing sol-gel nanoparticles (46 nm) at 723 K with a high pressure (4 GPa). The pressed compound orders ferromagnetically at 340 K (TC) and has a substantial drop in the thermomagnetic curve be…
In this article, we report the magnetic properties of ultrathin (15–200 Å) NiFe and CoFe films deposited using ion beam deposition techniques. They are symmetrically sandwiched between Ta, Cu, or Ta/Cu under and capping layers. NiFe and CoFe films grown between Ta/Cu and Cu/Ta bilayers exhibit the smallest magnetic th…
A two-dimensional computer model is developed to study the evolution of texture during the growth of layered mineral aggregates. The program computes the number, size and orientation (texture) of crystals forming the outer surface of the aggregate, as well as the evolution as a function of time. In particular, the ana…
The depletion-layer width and the recorded electric field in thermally poled fused silica are investigated experimentally as a function of the applied voltage. The depletion-layer width is observed to vary linearly with the poling voltage. The average electric field recorded in the depletion region was found to be (5.…
A recently developed density-functional method based on localized densities is applied to calculate electronic, structural, and vibrational properties of 20 alkali halides with elements lithium through cesium and fluorine through iodine. Properties calculated include dissociation energy, lattice parameter, dielectric…
A 55Mn and 139La NMR study of La0.35Ca0.65MnO3 is reported. The zero field 55Mn spectra consist of two lines centered at 290 and 375 MHz. Their behavior under an applied magnetic field makes it possible to attribute them to regions of antiferromagnetically and ferromagnetically coupled Mn spins, respectively. This giv…
The dispersion of dendrimers in a liquid crystal (LC) is reported as a new approach to LC displays based on light scattering. It is shown that the performance of a fifth-generation palmitoyl-functionalized poly(propylene imine) dendrimer—with 64 “legs”, as shown in the Figure—as an electro-optical switch is superior t…
Thin films of (001)-oriented Sr2FeMoO6 have been epitaxially deposited or LaAlO3 and SrTiO3 (001) substrates by pulsed laser deposition. The deposition conditions were optimized. Single-phase Sr2FeMoO6 was obtained in 100 mTorr 99.999% Ar gas at 825 °C. Transport and magnetic data showed a metallic temperature depende…
We investigate both analytically and by numerical simulation the kinetics of a microscopic model of hard rods adsorbing on a linear substrate, a model that is relevant for compaction of granular materials. The computer simulations use an event-driven algorithm that is particularly efficient at very long times. For a s…
A 4.5-inch fully sealed carbon-nanotube field-emission display with a 200-µm narrow gap was fabricated on glass using paste squeezing and surface rubbing techniques. The fabricated displays were fully scalable at low temperatures below 415°C and showed very high luminance of 1800 cd/m 2 at 4 V/µm. The degradation of e…
The synthesis and mesomorphic properties of several achiral compounds composed of banana-shaped molecules are described. These compounds belong to three different homologous series. They have been examined by polarized light microscopy, differential scanning calorimetry, x-ray diffraction studies and electro-optic inv…
New series of macrocyclic Schiff-base lanthanide(III), yttrium(III), and cadmium(II) complexes, [M(1)]Xn (X = NO, M = Y, Ln = La–Yb except Pm and Dy; X = ClO, M = Cd, La, Ce, Pr, Sm, Gd, or Er) and [M(3)]Xn (X = NO, M = Dy; X = ClO, M = Er and Cd), have been prepared by cyclocondensation of O1,O7-bis(2-formylphenyl)-1…
The magnetization through an electric-field-driven transition from a charge ordered state to a conducting one in polycrystalline ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3},$ with $x=1/3$ and $0.4,$ have been measured, simultaneously with current-voltage characteristics. These measurements hav…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSonochemical Preparation of a Nanostructured Bifunctional CatalystGennady Dantsin and Kenneth S. SuslickView Author Information School of Chemical Sciences University of Illinois at Urbana-Champaign 600 S. Mathews Avenue, Urbana, Illinois 61801 Cite this: J. Am. Chem.…
With the use of information entropy theory, the orientational distribution function of cylindrically symmetric probe molecules in uniaxial systems is reconsidered from the second-rank and fourth-rank Legendre polynomials (< P 2n (cos θ)>) order parameter values. Emphasis is put on the domain of negative values (…