Materials Literature
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We present an x-ray diffraction study of the vanadium-doped blue bronze ${\mathrm{K}}_{0.3}({\mathrm{Mo}}_{0.972}{\mathrm{V}}_{0.028}){\mathrm{O}}_{3}.$ At low temperature, we have observed both an intensity asymmetry of the $\ifmmode\pm\else\textpm\fi{}{2k}_{F}$ satellite reflections relative to the pure compound, an…
Microdomain structures and phase transitions in binary blends consisting of a highly asymmetric block copolymer and a homopolymer were investigated using transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and oscillatory shear rheometry. For the study, a polystyrene- block -polyisoprene- bloc…
A novel chemical solution deposition method has been developed for the preparation of ferroelectric strontium bismuth tantalate (SBT) thin films. The chemical process is based on the synthesis of air-stable solutions. Ferroelectric SBT films, derived from these solutions, have been crystallized by rapid thermal proces…
Friction force microscopy (FFM) was used to distinguish the different surface terminations on the nanoscale on atomically flat SrTiO3(001) surfaces, obtained by a combination of ultrasonic agitation and subsequent annealing in air at 1000 °C. The surface exhibits atomically flat terraces and sharp steps whose height i…
The electric field-induced antiferroelectric (AFE) to ferroelectric (FE) phase transition in lead strontium zirconate titanate (PSZT) ceramics was studied by means of dielectric, polarization, and strain hysteresis measurements. PSZT compositions with varying strontium and Zr/Ti ratio, located in the ferroelectric, an…
The precipitation of thermo-responsive polymers from solution on heating is a well-known phenomenon. But how do such polymers behave at interfaces? By direct observation, with surface plasmon resonance, of the thermo-responsive effect of a polymer grafted to a gold surface, it was shown that the polymer undergoes a ph…
UDP-3-O-(acyl)-N-acetylglucosamine deacetylase (LpxC) catalyzes the second step in the biosynthesis of lipid A in Gram-negative bacteria. Compounds targeting this enzyme are proposed to chelate the single, essential zinc ion bound to LpxC and have been demonstrated to stop the growth of Escherichia coli. A comparison…
Charge, spin, as well as lattice instabilities are investigated in isolated or weakly coupled chains of correlated electrons at quarter filling. Our analysis is based on extended Hubbard models including nearest-neighbor repulsion and Peierls coupling to lattice degrees of freedom. While treating the electronic quantu…
Local electronic properties of metallic-semiconducting carbon nanotube heterostructures are investigated by studying the behavior of the one-electron local density of states (LDOS) along the tubes. We determine how these properties change from the metallic to the semiconducting side of a nanotube junction. We show tha…
The magnetic properties of carbon nanohorns were investigated by electron spin resonance. Two decoupled electronic systems were found. The first one, which has a spin susceptibility linearly varying with temperature, was tentatively attributed to two-dimensional graphenelike sheets. The second contribution, showing a…
Fatigue rates in the Pb(Zn1/3Nb2/3)O3–PbTiO3 perovskite solid solution were investigated for different compositions in the rhombohedral and tetragonal phases in a variety of directions, at various field levels. It was found that the fatigue rates depend on both the ferroelectric phase and crystallographic orientation.…
Vertically well-aligned multiwall carbon nanotubes (MWNTs) were grown on nickel-coated glass substrates by plasma-enhanced chemical vapor deposition at low temperatures, below 600 °C, with and without hot filament. Acetylene and ammonia gas were used as the carbon source and a catalyst. Effects of growth parameters, s…
We have investigated two regions of manganite phase space; one where ferromagnetic (FM), metallic and charge-ordered (CO), insulating phases become the ground and high-temperature states, respectively, and the other with the reversed order. We found that the coexistence of FM and CO phases in broad temperature ranges…
Spin-glass states above room temperature have been found in (Mg, Fe){Mg,Fe,Ti}2O4 spinel ferrite thin films formed on Al2O3 (0001) and SrTiO3 (111) substrates. The films show a long-time relaxation of the magnetization in zero-field-cooled operation and a frequency dependence of the cusp temperature in ac susceptibili…
Self-consistent band-energy-structure calculations of the band-energy structure of ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}$ single-crystalline films grown on ${\mathrm{SiO}}_{2}$ and Si surfaces, with a thickness of about 1 \ensuremath{\mu}m, have been carried out in order to simulate thermopower behaviors. The norm-conse…
Die Kombination langlebiger, spektralreiner Emission von YbIII-Ionen mit der ausgeprägten Fähigkeit organischer Farbstoffe zur Lichtabsorption ergibt photolumineszente Lanthanoidkomplexe, die eine neue Klasse von Lumineszenzmarkern für biologisch und/oder medizinisch relevante Verbindungen sein könnten. Der gezeigte w…
Three current methods, used to evaluate exchange coupling constants in molecular magnetism, i.e., the molecular orbital (MO) model [Hay et al., J. Am. Chem. Soc. 94, 4884 (1975)], the valence bond (VB) model [Kahn and Briat, J. Chem. Soc. Trans. II 72, 268 (1976)], and the broken symmetry (BS) model [Noodleman, J. Che…
Density-functional calculations have been performed to investigate the reaction of diamond (100) surfaces with the hydrogen and methyl radical. In the present study, the plasma chemical-vapor deposition process using ${\mathrm{CH}}_{4}/{\mathrm{H}}_{2}$ gas was considered. The reactions with vapor ${\mathrm{CH}}_{3}$…
A detailed structural analysis of the $\mathrm{NiO}(111)\ensuremath{-}p(2\ifmmode\times\else\texttimes\fi{}2)$ surface by surface x-ray diffraction is presented and previous interpretations are revisited. The surface adopts the octopolar reconstruction after air annealing and a spinel-like configuration after UHV anne…
Heusler alloy Ni2MnGa thin films have been grown pseudomorphically on a relaxed NiGa interlayer on GaAs(001) by molecular-beam epitaxy. In situ reflection high-energy electron diffraction patterns, ex situ x-ray diffraction, and cross-sectional view transmission electron microscopy electron diffraction patterns confir…