Materials Literature
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This study investigated the variations in the dielectric constant with film thickness and measurement temperature of (Ba0.48Sr0.52)TiO3 thin-film capacitors with thicknesses ranging from 65 to 273 nm. The films were prepared by an on-axis rf magnetron sputtering, having Pt top and bottom electrodes. The thicker film s…
Using first-principles total-energy and dynamic phonon calculations, we study the structural transformation to and stability of cubic ${\mathrm{BC}}_{2}\mathrm{N}$ phases under pressure. We show that different starting material forms lead to distinct synthesis routes, yielding end products with drastically different p…
Abstract Extrusion coating was used to obtain montmorillonite/polyethylene‐coated paperboard. The coating was prepared from a master batch containing maleated polyethylene, low‐density polyethylene and 32 wt.% polyvinylpyrrolidone‐surface‐modified montmorillonite clay, which was blended with different amounts of low‐d…
Belt-like ZnS with visible photoluminescence was synthesized rapidly with Zn and S in the vapor phase.
Carbon nanotube morphology has been engineered via simple control of applied voltage during dc plasma chemical vapor deposition growth. Below a critical applied voltage, a nanotube configuration of vertically aligned tubes with a constant diameter is obtained. Above the critical voltage, a nanocone-type configuration…
Single crystals of ${\mathrm{La}}_{0.7\ensuremath{-}y}{\mathrm{Nd}}_{y}{\mathrm{Pb}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ with different $y$ are grown by flux growth technique. The influence of change in average cationic radius $(⟨{r}_{\mathrm{A}}⟩)$ and cation size disorder $({\ensuremath{\sigma}}^{2})$ on the transport…
Ferromagnetic hexagonal $\ensuremath{\alpha}$-MnAs has a first-order phase transition to $\ensuremath{\beta}$-MnAs at about 40 \ifmmode^\circ\else\textdegree\fi{}C. Because it shows no long-range antiferromagnetic order, most workers assume that it is paramagnetic in spite of the fact that it does not have a Curie-Wei…
Abstract Accurate reactive chemicals data form the cornerstone of procedures used to assess the hazards associated with commercial chemical production and use. Since 1967, the ASTM E27 Committee on the Hazard Potential of Chemicals has issued numerous, widely used consensus standards dealing with diverse testing and p…
This letter discusses theoretical studies of optical properties of gold nanospheres and nanorods with various aspect ratios; these are embedded in a porous anodic alumina matrix. The nanoparticles have potential applications in optical filters and sensors.
A four-time correlation function was calculated using a computer simulation of a binary Lennard-Jones mixture. The information content of the four-time correlation function is similar to that of four-time correlation functions measured in NMR experiments. The correlation function selects a subensemble and analyzes its…
The hydrosilylative reaction utilizing octakis(dimethylsiloxy)silsesquioxane and silsesquioxane disilanols bearing alkenylsilyl moieties produces a series of starburst-type giant silsesquioxanes and a second-generation dendritic molecule as well as a boron-containing one.
High-accuracy single-crystal structure factor data sets, complete up to $\mathrm{sin}\phantom{\rule{0.2em}{0ex}}\ensuremath{\theta}∕\ensuremath{\lambda}=1.6\phantom{\rule{0.3em}{0ex}}{\mathrm{\AA{}}}^{\ensuremath{-}1}$, have been measured from paramagnetic NiO at $550\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and in the a…
We present a study of the spin-Peierls (SP) transition in the ${(\mathrm{TMTTF})}_{2}{\mathrm{PF}}_{6}$ organic conductor by elastic neutron scattering. The $(\frac{1}{2},\frac{1}{2},\frac{1}{2})$ superstructure reflection associated with the SP transition is clearly detected up to $18\phantom{\rule{0.3em}{0ex}}\mathr…
The neutral nickel and gold complexes with bis(trifluoromethyl)tetrathiafulvalenedithiolate ligands, [M(hfdt)2] (M = Ni, Au) were prepared in order to examine the possibility of the development of single-component molecular conductors soluble in organic solvents. However, in contrast to the previous report, the crysta…
Reversible redox-switching of through-bond magnetic interaction has been achieved by conformation change of the tetraarylethylene moiety upon redox input: intramolecular magnetic interaction between two nitroxide groups is dead after oxidation, whereas it was alive before.
The nature of metal-insulator transition and ferromagnetism phenomena of perovskite ${\mathrm{La}}_{0.7}{\mathrm{Ce}}_{0.3}{\mathrm{MnO}}_{3}$ thin films was investigated. In particular, the effects of post-annealing under oxidization and reduction atmospheres on the electrical transport and magnetic properties were s…
The achievement of a true nanotechnology is regarded as one of the Holy Grails of modern science. To achieve this will require the construction by synthesis or self-assembly of complex functional nanoarchitectures. Such structures might contain combinations of one-, two-, and three-dimensional phenylene nanostructures…
This paper reports a dendritic system which is capable of forming both one-component and two-component gels--interestingly the addition of the second component can either increase or decrease the degree of gelation, depending on dendritic generation.
The thermal conductivity $\ensuremath{\kappa}(T)$ of the $R\mathrm{V}{\mathrm{O}}_{3}$ crystals was measured. At $T>{T}_{\ensuremath{\infty}}$, $R\mathrm{V}{\mathrm{O}}_{3}$ crystals conduct heat like a glass; the phonon contribution to $\ensuremath{\kappa}(T)$ is completely suppressed by spin and orbital fluctuati…
Mg and Nb-doped Mg films were deposited by rf magnetron sputtering. Morphological and structural analysis were performed by scanning electron microscopy and x-ray diffraction. The desorption kinetics has been investigated by using a Sievert-type apparatus. The overall activation energy and the reaction order controlli…