Materials Literature
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he structural, transport, magnetic and optical properties of the double perovskite $A_2$CrWO$_6$ with $A=\text{Sr, Ba, Ca}$ have been studied. By varying the alkaline earth ion on the $A$ site, the influence of steric effects on the Curie temperature $T_C$ and the saturation magnetization has been determined. A maximu…
A narrow-gap ferromagnetic In1−xMnxSb semiconductor alloy was grown by low-temperature molecular-beam epitaxy on CdTe/GaAs hybrid substrates. Ferromagnetic order in In1−xMnxSb was unambiguously established by the observation of clear hysteresis loops both in direct magnetization measurements and in the anomalous Hall…
Based on the conventional energy band theory, an approach is presented to describe the electronic structure of crystalline insulators in the presence of a finite homogeneous electric field. The expression of polarization is derived which extends the ``Berry-phase'' theory of polarization to nonzero fields. The charact…
Thermal properties - specific heat and heat conductivity coefficient—of polycrystalline BaTiO 3 films on massive substrates were studied as a function of the temperature and the film thickness by the ac-hot probe method. The anomalies of specific heat with the film thickness decreasing from 1100 to 20 nm revealed the…
The explicit dispersion equation for a one-dimensional periodic structure with alternative layers of left-handed material (LHM) and right-handed material (RHM) is given and analyzed. Some unusual phenomena such as spurious modes with complex frequencies, discrete modes and photon tunneling modes are observed in the ba…
We consider a possibility to create a metamaterial with nonlinear magnetic response in the microwave frequency range. Such a metamaterial is a regular periodic three-dimensional-array of resonant conductive elements with diodes as nonlinear insertions. We calculate the arising quadratic nonlinear susceptibility and sh…
Abstract Heat is transported by phonons through dielectric solids such as ceramics and organic insulating resins. Especially in organic insulating resins, phonons scatter intensely mainly by their amorphous structure, which affects their thermal conductivities, usually 1 to 3 orders lower than those of ceramics and me…
The phase behavior of the binary system consisting of the commercial nucleating and clarifying agent 1,3:2,4-bis(3,4-dimethyldibenzylidene)sorbitol (DMDBS, Millad 3988) and isotactic polypropylene ( i -PP) was investigated over the entire concentration range by means of differential scanning calorimetry (DSC), rheolog…
We report on fabrication and electrical characteristics of ZnO nanorod Schottky diode arrays. High quality ZnO nanorods were grown for the fabrication of the Schottky diodes using noncatalytic metalorganic vapor phase epitaxy and Au was evaporated on the tips of the vertically well-aligned ZnO nanorods. I–V characteri…
A gas sensor, fabricated by the simple casting of single-walled carbon nanotubes (SWNTs) on an interdigitated electrode (IDE), is presented for gas and organic vapor detection at room temperature. The sensor responses are linear for concentrations of sub ppm to hundreds of ppm with detection limits of 44 ppb for NO 2…
Tetra(carboxamido)perylen-Farbstoffe können nach einer allgemeinen Methode synthetisiert werden. In DMSO bildet Derivat A nanokristalline Aggregate, deren photophysikalische Eigenschaften sich signifikant von denen des Monomers unterscheiden (siehe Bild). Die Struktur der Aggregate wurde rasterkraftmikroskopisch unter…
Siliciumoxidnitride sind durch Einführung von NHx-Spezies in mesoporöses Siliciumdioxid zugänglich. Die basischen Zentren dieser Materialien erwiesen sich als effiziente Katalysatoren für Knoevenagel-Kondensationen (siehe Bild). Durch ihre große Oberfläche und Poren sind die hochgeordneten mesoporösen Oxidnitride eine…
In the framework of solvent diffusion in glassy polymer films, this paper concerns an experimental study of sorption and desorption kinetics for a model system consisting of statistical PMMA/PnBMA copolymer films of various composition. The experimental results are obtained by performing differential increasing and de…
It is common for thin films to have a predominant texture, but not alternating textures. In this letter, we report a copper film of alternating textures through self-organization. Using dc magnetron sputtering technique, we deposit copper films on a SiO2/Si(111) substrate. A thin layer of copper of 〈111〉 texture is fi…
Abstract Conductive polymer composites used as candidates for positive temperature coefficient (PTC) materials are faced with performance decay characterized by gradually increased room‐temperature resistivity and decreased PTC intensity. Considering that deterioration of the properties is mainly related to the capabi…
Abstract Polyethylene (PE)‐filled with carbon black (CB) is a prototypical composite that displays resistance switching. These materials can exhibit either a positive temperature coefficient (PTC) or negative temperature coefficient (NTC). The CB‐filled semicrystalline polymer composites ideally need antioxidants, whi…
We report here the X-ray magnetic circular dichroism (XMCD) study at the Gd M(4,5)- and L(2,3)-edges of two linear magnetic chains involving Gd(III) cations bridged by nitronyl nitroxide radicals. This spectroscopy directly probes the magnetic moments of the 4f and 5d orbitals of the gadolinium ions. We compare macros…
A novel layered K(4)Ag(2)Sn(3)S(9) x 2KOH was synthesized solvothermally. A mixture of ethanol and HSCH(2)CH(SH)CH(2)OH was used for the synthesis. The HSCH(2)CH(SH)CH(2)OH plays an important role and appears to serve as a mineralizer for the solvothermal reaction. A layer comprises Sn(3)S(9)(6)(-) clusters linked by…
For the first time to our knowledge, the ${}^{13}\mathrm{C}$ solid-state magic angle spinning (MAS) NMR spectrum of a 99% ${}^{13}\mathrm{C}$ enriched tetrahedral amorphous-carbon (ta-C) thin film containing a high concentration of fourfold coordinated carbon species (82%) is reported along with measured NMR spectra f…
A comparative investigation has been carried out on second-row-atom-doped linear carbon clusters C n X/C n X + /C n X - ( n = 1−10) using density functional theory (DFT-B3LYP) method in conjunction with 6-311+G* basis sets. For each linear C n X/C n X + /C n X - species, the low-lying states, total energies, geometrie…