Materials Literature
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An experimental phase diagram of the field-induced superconductivity in the lambda-(BETS)_2FeCl_4 compound is theoretically reproduced by a combination of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state and the Jaccarino-Peter mechanism. Semi-quantitative agreement is obtained in the presence of a very weak subdomin…
The thermoelectric properties of solid solutions of the type β-K2Bi8−xSbxSe13 (0<x<8) were studied with respect to thermal behavior, band gap variation, and charge transport properties as a function of x. At x values between 0 and 1.5, the energy band gap is observed to decrease (anomalous) before it wid…
Small flashes (b) occur during the freezing of triethylgallium samples in liquid nitrogen, and on warming from −196°C this is accompanied by decomposition (a). This effect was observed during the determination of the crystal structures of GaMe3 and GaEt3, which both show intermolecular interactions between their elect…
The ac conductivity and dielectric relaxation properties of silver selenomolybdate glasses, Y% AgI–(1–Y)%{MAg2O–F[0.4SeO3–0.6MoO3]} with varying dopant salt concentration, Y=20–80% have been investigated as a function of frequency and temperature. The dc conductivity is found to increase by more than two orders of mag…
Monoclinic Ga2O3 nanobelts and nanosheets are obtained by a simple chemical route involved with H2O at 950 °C in Ar atmosphere. Electron microscopy observations reveal that the as-synthesized Ga2O3 nanobelts and nanosheets are structurally uniform, single crystalline, and most of them are free of defects and dislocati…
Ion beam etching of sputtered Pb(Zrx,Ti1−x)O3 (PZT) with x equal to 0.54 thin films grown on Pt/Ti/SiO2/Si substrates has been performed using pure Ar gas. The etch rate dependence on the process parameters (current density, acceleration voltage, gas pressure) has been investigated. The PZT etch rate can reach 600 Å/m…
Cluster catalysts for directed oxygen transfer? In attempts towards the creation of novel catalytic systems for directed oxygen-transfer processes a novel type of polyoxometalate cluster containing vanadium was synthesized. The first example of a polyoxovanadate composed of a hexavanadate molecular center and two reac…
Synthesis of micropore-free hydrothermally stable mesoporous silica SBA-15 has been accomplished by templating a silica precursor (sodium silicate/tetraethylorthosilicate) with pluroni123 copolymer (EO20PO70EO20; M.W. 5,800) in the presence of cosolvent (ethanol) using a minimum salt (sodium chloride) content, under m…
The virial expansion of the collective mobility (sedimentation) coefficient is considered for hard sphere suspensions at equilibrium. The term of the second order in volume fraction, which involves three-particle hydrodynamic interactions, is calculated with high accuracy. To achieve that we represent the collective m…
Liquid-state integral equation methods are employed to study the thermodynamic and structural properties of ideal and repelling rigid rods mixed with hard spheres in the limits when one of the species is dilute. The role of rod aspect ratio and sphere/rod size asymmetry is explored over a wide range of system paramete…
We report a method to fabricate carbon nanotubes (CNT)/conducting polymer composite films for the application of CNTs to field emission displays. The composite was prepared by a combination of electrochemical polymerization of pyrrole and electrophoretic deposition of CNTs. We obtained a uniform CNT/conducting polypyr…
Beautiful offspring: Manganese/oxide/carboxylate-cluster chemistry continues to surprise with its rich variety of structural types. Here a new Mn21 cluster (see picture Mn4+ (red), Mn3+ (green)) with a 12 MnIII9 MnIV oxidation level and an approximately planar core is reported.
Progress reports are a new type of article in Advanced Engineering Materials, dealing with the hottest current topics, and providing readers with a critically selected overview of important progress in these fields. It is not intended that the articles be comprehensive, but rather insightful, selective, critical, opin…
Low-k films with k of 2.5–2.9 were deposited under different conditions of pressures and temperatures using a plasma-enhanced chemical vapor deposition (PECVD) system. These films were prepared using a new liquid precursor, tetravinyltetramethylcyclotetrasiloxane (TVTMCTS) and H2 carrier gas. The rf power was kept as…
Resonance enhanced multiphoton ionization and cavity ring down spectroscopies have been used to provide spatially resolved measurements of relative H atom and CH3 radical number densities, and NH column densities, in a hot filament (HF) reactor designed for diamond chemical vapor deposition and here operating with a 1…
The structures of cis and trans forms of a binuclear subphthalocyanine (SubPc) have been determined by X-ray crystallography (see pictures). Electronic absorption and magnetic circular dichrosim spectra of these dimers are similar in shape, but the Q band of the trans isomer appears at longer wavelength than that of t…
X-ray diffraction measurements have been performed on a single crystal sample of the rare earth metal holmium. The temperature and magnetic field dependence of the c -lattice parameter was studied in detail below the Néel temperature of 132 K. Magnetic structural phase transitions were observed as a change in the c -l…
Nanocomposite SrFe12O19/γ-Fe2O3 permanent ferrites have been prepared by the sol-gel method and their structure and magnetic properties have been analyzed by x-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. When thermal treatment temperature is below 800 °C, the samples pressed i…
The spontaneous-emission lifetime of CdSe/CdS core-shell quantum dots was studied as a function of the distance between the dots and a polished Si surface. The experimental results reveal a significant modification of the spontaneous-emission rate of the quantum dots by the Si surface.
The structural and optical properties of nitrogenated amorphous carbon films, grown by rf-magnetron sputtering on silicon substrates, were studied by Raman and photoluminescence (PL) spectroscopy as a function of the nitrogen concentration and the substrate bias voltage Vb. For films deposited with Vb=10 V, the photol…