Materials Literature
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The electrical properties of a series of CaCu 3 Ti 4 O 12 ceramics prepared by the mixed oxide route and sintered at 1115°C in air for 1–24 h to produce different ceramic microstructures have been studied by Impedance Spectroscopy. As‐fired ceramics are electrically heterogeneous, consisting of semiconducting grains a…
This paper reports on the bulk properties of the quaternary Heusler alloy ${\mathrm{Co}}_{2}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}\mathrm{Si}$ with the Fe concentration $x=0,1∕2,1$. All samples, which were prepared by arc melting, exhibit $L{2}_{1}$ long-range order over the complete range of Fe concentrati…
Abstract The effects of confinement on glass transition temperature ( T g ) and physical aging are measured in polystyrene (PS), poly(methyl methacrylate) (PMMA), and poly(2‐vinyl pyridine) (P2VP) nanocomposites containing 10‐ to 15‐nm‐diameter silica nanospheres or 47‐nm‐diameter alumina nanospheres. Nanocomposites a…
The combination of nanomaterials as solid supports and supramolecular concepts has led to the development of hybrid materials with improved functionalities. These "hetero-supramolecular" ideas provide a means of bridging the gap between molecular chemistry, materials sciences, and nanotechnology. In recent years, rele…
A unique type of carbon structure, radial textured carbon nanoflake spherules, has been synthesized by a microwave plasma assisted chemical vapor deposition method. The spherules with a diameter of 1.2–35μm consist of a number of radially distributed carbon nanoflakes growing from a common core. The constituent nanofl…
An unusually high damping peak of 20% has been observed in Ni52Mn24Ga24 single crystals accompanying with martensitic transformation. The high damping capacity can be retained in the low-temperature martensite phase when a bias field of 0.4T was applied along the measurement direction. The magnetically controlled high…
Surface plasmon polaritons (SPPs) of a metal film can efficiently be excited when a light emitter is placed nearby. The excited SPPs are converted to photons by compensating for the momentum mismatch. The authors study SPP-mediated emission from excitons in Si nanocrystals (Si-nc’s) by placing an organic grating on a…
Luminescent, cerium doped Lu2SiO5 thin films with C2∕c symmetry have been prepared by pulsed laser deposition (PLD) at temperatures much lower than the crystallization temperature (2150°C) of the corresponding bulk crystals. The PLD grown films show the typical luminescence resulting from the Ce3+ 5d-4f transition. Ma…
The authors have observed stable, reversible two-resistance states with substantial tunneling magnetoresistances of opposite signs in La0.7Sr0.3MnO3∕SrTiO3∕Co1−xCrx junctions. Electron energy loss spectroscopy studies reveal the segregation and oxidation of electrochemically reactive chromium at that interface, result…
The creation of tailored films of size-selected metal clusters of mixed size and composition is reported. The TEM image shows Au10 000 and Au330 nanoclusters co-deposited on amorphous carbon. At room temperature the different cluster sizes are present but coalescence is observed at 200 °C. High-angle annular dark-fiel…
As the system where both space-inversion and time-reversal symmetries are broken simultaneously, the authors have investigated an Er3+-doped ferroelectric (Ba,Sr)TiO3 single crystal under magnetic field, in which the luminescent magnetic Er3+ ion occupies a noncentrosymmetric site. The k-directional dichroism, termed…
The authors report a simple method for providing a polymer support structure for carbon nanotube (CNT) arrays for device applications. This method has a twofold effect: firstly it secures the nanotubes to the substrate and secondly it significantly decreases the threshold field for field emission from 26.2to9.7V∕μm. T…
Fully reversible crystal photochromism between the μ-O2SSO2 (1) and μ-O2SOSO (2) forms of a dinuclear rhodium complex has been observed. The photochromic reaction, including stereoselective oxygen-atom transfer and stereospecific transformation of photochemically generated μ-O2SOSO isomers into the most stable isomer,…
The features of the IV characteristics of metallic carbon nanotubes (m-CNTs) in different experimental setups are studied using semiclassical Boltzmann transport equation together with the heat dissipation equation to account for significant thermal effects at high electric bias. The model predicts that the shape of t…
A wurtzite N-doped MgZnO film with 20at.% Mg (MgZnO:N) was grown by plasma-assisted molecular beam epitaxy on c-plane sapphire using radical NO as oxygen source and nitrogen dopant. The as-grown MgZnO:N film behaves n-type conduction at room temperature, but transforms into p-type conduction after annealed for 1h at 6…
Ge 2 Sb 2 Te 5 (GST) films were deposited on TiN(50nm)∕SiO2∕Si substrates and trench structures of TiAlN(100nm)∕Si with various deposition parameters by metal organic chemical vapor deposition (MOCVD). Hexagonal GST films were deposited at temperatures of 330–370°C, deposition pressure of 40Torr, bubbling temperatures…
In this letter, the authors report the formation mechanism of one-dimensional nanostructural polyaniline prepared by an interfacial polymerization. The transmission electron microscopy image of the conducting polymer exhibits a diameter of ∼80nm and a length of ∼1μm. The resistivity of the polymer at room temperature…
By employing a high-energy x-ray diffraction technique, the authors report that uniaxial tensile plastic deformation induced the grain growth and texture development in a bulk nanocrystalline Ni–Fe alloy. The effects become more pronounced with increasing the plastic strain (closer to the fracture surface). The textur…
Abstract The sorption of compressed gases in polymers causing a reduction in the glass transition temperature ( T g ) is well established. There is, however, limited information on polymer–gas systems with favorable interactions, producing a unique retrograde behavior. This paper reports on using a combination of esta…
Exploring orientation: With the help of atomic force microscopy, the linkage and orientation of covalently bound surface molecules can be investigated (see picture). Nebel and co-workers applied this technique to the characterization of DNA films covalently bound to a diamond surface for the first time.