Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDevelopment of Bu3SnH-Catalyzed Processes: Efficient Reduction of Azides to AminesDavid S. Hays and Gregory C. FuView Author Information Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Cite this: J. Org. Chem. 1998, 63, 9,…
In situ small- and wide-angle X-ray scattering (SAXS and WAXS) experiments combined with Raman spectroscopy and thermal analysis have been performed to study the phase behavior of syndiotactic polystyrene (sPS) solutions. Three different solvents were used, respectively, decalin, benzyl methacrylate, and cyclohexyl me…
Chemical kinetic modeling was used to simulate the autoxidation of jet fuel including the chemistry of peroxy radical inhibiting antioxidants and hydroperoxide decomposing species. Recent experimental measurements of oxygen concentration during autoxidation of model hydrocarbon solvents were used to “calibrate” the ra…
Hexanoic (hex) and fulvic acid (FA), representing early and later stages of landfill leachate evolution, were examined for influence on trace metal adsorption by a poorly crystal lized kaolinite (KGa-2). Our experiments represented a model approach to examine possible reaction mechanisms in an environmentally importan…
Silica-supported bimetallic MSn (M = Ni, Pd, Pt) samples have been prepared by two consecutive impregnation steps with solutions of [MCl 2 (PPh 3 ) 2 ] complexes and SnCl 2, respectively. After treatment in H 2 at 673 K, these materials were characterized in detail by X-ray diffraction (XRD), conventional transmission…
In this article, we motivate the detailed comparison of the physical properties of individual configurations of a ferroelectric solid solution as a means toward developing first principles models for these systems. We compare energies, dielectric constants epsilon_infinity, mode effective charges of local polar distor…
We study the effect of long-range elastic interactions in the dynamical behavior of an elastic chain driven quasi-statically in a quenched random pinning potential and in the strong pinning limit. This is a generic situation occuring in solid friction, crack propagation, wetting front motion, ... Tuning the exponent o…
The hydrogenation disproportionation desorption recombination (HDDR) process was applied to produce isotropic, submicron powder in 500 g batches in a specially designed HDDR reactor. The hot pressing characteristics of the material were determined and it was shown that the material has an excellent stability against g…
The temperature and frequency dependences of the permittivity , the dielectric loss factor and the resistance R of the ceramic Ti in the interval 100-800 C were studied. A ferroelectric phase transition at temperature C was observed. Hysteresis loops typical for ceramic ferroelectrics were observed. Relaxation maxima…
Electrical transport in polycrystalline ceramics of K-type has been investigated as a function of temperature using complex-plane impedance analyses, dielectric properties, DC conductivities by the four-probe method, thermoelectric power and magnetic susceptibilities. The bulk conductivities were obtained using the co…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA New Palladium(II)-Catalyzed Asymmetric Chlorohydrin SynthesisArab El-Qisairi, Othman Hamed, and Patrick M. HenryView Author Information Department of Chemistry, Loyola University of Chicago, Chicago, Illinois 60626 Cite this: J. Org. Chem. 1998, 63, 9, 2790–2791Publi…
Measurements of the order-parameter critical exponent $\ensuremath{\beta}$ at the uniaxial-biaxial nematic phase transition in a lyotropic mixture are reported. They reveal a strong dependence of $\ensuremath{\beta}$ on the concentration of the mixture compounds with two distinct intervals of values separated by a dis…
The ability to modify the stacking sequence of ultrathin films offers a unique way to change either the interaction strength or the doping, but demands a careful control of each atomic monolayer. Progress is hampered by the lack of a direct method that allows differentiation on a local scale between the various termin…
Electrical properties of the interface between Bi4Ti3O12 ferroelectric film and p-Si substrate have been studied by capacitance–voltage (C–V) characteristics. It is found that the interface barrier can be broken down temporally because of the charge injection from Si substrate into the ferroelectric thin film, and thi…
A two-dimensional ferromagnetic Ising system composed of ferrimagnetically ordered chains with alternating spin- and spin- S atoms is investigated by the use of Ising spin identities and the differential operator technique, in order to clarify the magnetic properties of bimetallic molecular-based magnetic materials. T…
Weak uniaxial stress (< 1 kPa) along the cubic [100] and [110] directions of modifies significantly the domain structure near the crystal surface on cooling to the tetragonal phase. High-resolution x-ray rocking curves show that oriented slabs have a preference of ` c ' domains perpendicular to a small (001) surface.…
Electrooptic spectroscopy of an antiferroelectric liquid crystal is carried out over a range of frequencies from 1 Hz to 100 kHz. In the antiferroelectric SmCA phase two relaxation processes are found, one at the fundamental frequency of a mode and the second at twice the frequency of a different mode. A comparison of…
In a previous paper it was shown that in-crystal ion polarizabilities derived from low-frequency precision measurements of the dielectric constants of single-crystal oxides can be given a quantitative interpretation using a quantum mechanically based result for a single, completely filled, electron subshell. In this p…
The compressibility of wurtzitic boron nitride (wBN) taken in mixture with cubic BN has been measured at room temperature up to 66 GPa, using a diamond anvil cell and powder diffraction of synchrotron radiation. From the obtained pressure-volume relation for wBN the isothermal bulk modulus of B0=375±9 GPa and its firs…
We report the results of magnetization measurements on pseudomorphic (fully strained) c-axis oriented colossal magnetoresistance manganite thin films grown by molecular beam epitaxy. We observe uniaxial magnetic anisotropy (hard axis/easy plane) with the easy plane being the film plane. Within the plane a weaker biaxi…