Materials Literature
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We have computed the local electric field in a body-centered tetragonal (BCT) lattice of point dipoles via the Ewald-Kornfeld formulation, in an attempt to examine the effects of a structure transformation on the local field strength. For the ground state of an electrorheological solid of hard spheres, we identified a…
Abstract Measurements of water vapor transmission rate ( WVTR ) are often based on the wet cup method described by ASTM E 96‐95. In attempting to compare the performance of thin polymer films with moderate to high water vapor permeability, it was observed experimentally that the ASTM method did not give reliable resul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleResonant DiffractionJean-Louis Hodeau, Vincent Favre-Nicolin, Sandra Bos, Hubert Renevier, Emilio Lorenzo, and Jean-Francois BerarView Author Information Laboratoire de Cristallographie-CNRS, Associe a l'Université Joseph Fourier, 25 Avenue des Martyrs, BP 166, F-38042 Grenoble…
Small amplitude, long waves travelling over the surface of a current-carrying metal thin film are studied. The equation of motion for the metal surface is determined in the limit of high applied currents, when surface electromigration is the predominant cause of adatom motion. If the surface height h is independent of…
We report the growth of high-quality c-axis-oriented epitaxial MgB2 thin films by using a pulsed laser deposition technique. The thin films grown on (1`1 0 2) Al2O3 substrates show a Tc of 39 K. The critical current density in zero field is ~ 6 x 10^6 A/cm2 at 5 K and ~ 3 x 10^5 A/cm^2 at 35 K, suggesting that this co…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFirst Oxadiazole-Functionalized Terbium(III) β-Diketonate for Organic ElectroluminescenceJiafu Wang, Ruiyao Wang, Jun Yang, Zhiping Zheng, Michael D. Carducci, Troy Cayou, Nasser Peyghambarian, and Ghassan E. JabbourView Author Information Department of Chemistry and O…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
A recently developed long-wavelength continuum phenomenological model is employed to study phonon tunneling for an arbitrary incidence angle, and to estimate the contribution of optical phonons to the perpendicular thermal conductivity in simple and multisuperlattice nonpolar semiconductor heterostructures. Phonon tun…
Abstract Motion of chains of poly(ethylene oxide) within the interlayer spacing of 2:1 phyllosilicate/montmorillonite was studied with 1 H and 13 C NMR spectroscopy. Measurements of the 1 H NMR line widths and relaxation times across a large temperature range were used to determine the effect of bulk thermal transitio…
Abstract A series of amorphous copolymers containing disperse red 1 and crosslinkable acrylic groups were prepared. The crosslinked polymers were prepared in thin films by thermal polymerization of the acrylic groups in the copolymers. The orientation induced by irradiation with a linearly polarized laser was measured…
The thermal dependence of the structure of natural phengite-2M 1 with chemical formula (K 0.95 Na 0.05 )(Al 0.76 Fe 0.14 Mg 0.10 2 (Si 3.25 Al 0.75 )O 10 (OH 1.96 F 0.04 ) has been studied by in situ neutron diffraction. The short-range correlated behaviour of the hydroxyl group was probed by FTIR spectroscopy while t…
As a missing link of the tourmaline classification, an X-site vacant analogue of olenite was synthesized from three different starting compositions in the system Al2O3-B2O3-SiO2-H2O (ABSH) over the PT-range 4–40 kbar, 450–700 °C, however never as a single phase product; dumortierite with either quartz or with jeremeje…
One of the most interesting properties of quantum dots is the possibility to tune the band gap as a function of their size. Here we explore the possibility of changing the lifetime of the lowest-energy excited state by altering the surface passivation. We show that a moderately electronegative passivation potential ca…
Polarized single-crystal Raman scattering and powder infrared absorption spectra of Fdd2 orthorhombic natural natrolite (Na1.88 K0.02 Ca0.04 )(Al1.96 Si3.03 O10)⋅2.03 H2O from Khibiny, Kola peninsula, were measured. Using short-range models, lattice-dynamical calculations were performed for an idealized natrolite stru…
A photopyroelectric technique has been applied to the study of specific heat and thermal conductivity of homeotropically aligned mixtures of small quartz spheres (aerosil) and octylcyanobiphenyl (8CB) with concentration 0</=rho(s)</=0.04 g/cm(3). Thermal conductivity data show that, even at these very low concentratio…
The new mineral pillaite, Pb9Sb10S23ClO0.5, an oxy-chloro-sulfosalt, has been found at Buca della Vena mine in the Apuan Alps, northern Tuscany, Italy. It crystallized in small fractures of dolomitic lenses in massive Fe- Ba ore, together with many Pb-Sb sulfosalts, among which the oxy-sulfosalt scainiite. Pillaite oc…
A new band assignment of the IR spectrum of mullite is proposed on the basis of FTIR powder spec- troscopy of Al-Si, Al-Ge, and Ga-Ge compounds and polarised FTIR single-crystal spectroscopy of oriented ultrathin Czochralski-grown Al-Si 2:1-mullite slabs. The structural parameters of the mullite compounds were obtaine…
Within the one-dimensional tight-binding minibands and on-site Coloumbic interaction approximation, the absorption spectrum and coherent wavepacket time evolution in an optically excited semiconductor superlattice driven by dc-ac electric fields are investigated using the semiconductor Bloch equations. The dominating…
The magnetization at low temperatures for Nd0.5Sr0.5MnO3 and Nd0.5Ca0.5MnO3 samples showed a rapid increase with decreasing temperatures, contrary to a La0.5Ca0.5MnO3 sample. Specific heat measurement at low temperatures showed a Schottky-like anomaly for the first two samples. However, there is not a straight forward…
The accurate charge density of MgB2 was observed at room temperature(R.T.) and 15K by the MEM(Maximum Entropy Method)/Rietveld analysis using synchrotron radiation powder data. The obtained charge density clearly revealed the covalent bonding feature of boron forming the 2D honeycomb network in the basal plane, on the…