Materials Literature
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The doping effect of paramagnetic organic radical impurities ( p -CyDTV) on the organic spin–Peiels (SP) system of p -CyDOV (3-(4-cyanophenyl)-1,5-dimethyl-6-oxoverdazyl; the SP transition temperature T SP =15.0 K) was studied by the heat capacity measurement down to 0.1 K. At low temperatures below 1 K, quite a sharp…
Zincblende ZnMgCdS quaternary alloy layers were grown by molecular-beam epitaxy. The ZnMgCdS alloy lattice matched with GaAs and exhibited the band-gap energy of approximately 3 eV. Zn, Mg, and CdS were used as source materials. Cd was replaced by Zn or Mg, and the alloy composition was controlled when the growth temp…
Control of Birefringence Dispersion of Uniaxially Oriented Poly(2,6-dimethyl 1,4-phenylene oxide)/Atactic Polystyrene Blend Films by Changing the Stretching Parameters, Uchiyama, Akihiko, Yatabe, Toshiaki
Abstract For Abstract see ChemInform Abstract in Full Text.
Spin excitation in a nano-graphite ribbon with zigzag edges is investigated theoretically. Due to the strongly localized nature of the states near Fermi energy, the effective Hamiltonian for the low energy physics is given by Heisenberg Hamiltonian with the nearest neighbor exchange coupling. The action corresponding…
An empirical relaxation function suitable for describing the dynamics in disordered materials is presented. The function is a generalization of the stretched exponential function and based on power-law decays. The influence of parameters on the shape of the correlation function is discussed. Numerically transformed da…
Nanostrukturierte graphitartige Kohlenstoff-Filme lassen sich mithilfe einer einfachen Pyrolysemethode herstellen. Ohne Weiterbehandlung erhält man Filme, die nicht nur Wasser abweisen, sondern auch ätzende Flüssigkeiten wie saure oder basische Lösungen. Das Bild zeigt Wassertropfen mit pH-Werten von 1.07 (links) und…
The luminescence characteristics of Gd 3+ , Tb 3+ and Eu 3+ activated YAl 3 (BO 3 ) 4 phosphors in the vacuum ultraviolet (VUV) and ultraviolet (UV) regions of 130–300 nm are investigated. It is shown that the non activated YAl 3 (BO 3 ) 4 phosphor emits UV light under the VUV excitation, and the emission is related t…
The use of atomic force microscopy (AFM) to tailor and image ferroelectric domains in the submicron and nanometer ranges is gaining increasing attention. Many applications have been developed that make use of the superhigh electric field generated by the sharp AFM tip in a local area. In this article, we derive an exp…
We study the effect of shear on the aging dynamics of a colloidal suspension of synthetic clay particles. We find that a shear of amplitude $\ensuremath{\gamma}$ reduces the relaxation time measured just after the cessation of shear by a factor $\mathrm{exp}(\ensuremath{-}\ensuremath{\gamma}/{\ensuremath{\gamma}}_{c})…
The relationship between the memory retention properties and the leakage current density of Pt/YMnO3/Y2O3/Si capacitors was discussed. The leakage current of the ferroelectric YMnO3 layer was varied by temperature and by annealing the capacitors. It was found that the retention time became shorter upon increasing the…
Abstract A hybrid mesoporous material containing etenylene in a two-dimensional, hexagonally arranged mesoporous silicate framework with long-range symmetry is successfully synthesized. Quantitative analysis of the reactive etenylene groups within the silicate framework indicates that approximately 30% of the etenylen…
Interface structures in double-layer ferroelectrics comprising two distinct layers of different polarization properties, with bilinear interface coupling across the interface, are examined analytically within the framework of Landau-Ginzburg phenomenological theory. The structures are investigated for coupled layers w…
The structure of 0.41(PbNi 1/3 Nb 2/3 )O 3 –0.36PbTiO 3 –0.23PbZrO 3 (0.41PNN–0.36PT–0.23PZ) ceramics changed from pseudocubic to tetragonal when ZnO was added. For the specimens sintered above 1000°C, bulk density slightly decreased with the addition of ZnO but it significantly increased for the specimens sintered be…
Der gemischtvalente Polyoxomolybdatcluster [H2MoVI12MoV4O52]10− wurde durch einen neuartigen „Einschweiß“-Ansatz isoliert, mit dem Cluster niedriger Symmetrie und nichtsphärischer Topologie abgefangen werden (siehe Schema; HMTAH+=protoniertes Hexamethylentetramin). Die ungewöhnliche Clusterform folgt daraus, dass eine…
Alternative Er doping into anatase (A–) or rutile (R−)TiO2 can be achieved by O2 pressure control during Er-doped TiO2 deposition using laser ablation. An x-ray absorption fine structure analysis of the atomic coordination around Er revealed the dynamics of Er–O clustering in A– and R−TiO2. The Er local structure in A…
Er-doped Si-rich silica layers were obtained by reactive magnetron sputtering and both structural and room-temperature photoluminescence properties were investigated. The controlled introduction of hydrogen in the plasma was found to play a critical role in the microstructure and distribution of the Si nanograins form…
Abstract For Abstract see ChemInform Abstract in Full Text.
Single crystal type IIa 〈100〉 diamonds were implanted with sulfur, phosphorus, and argon ions under different implantation and annealing conditions. Shallow (sub-MeV) as well as deep (MeV) implantations into samples held at low (liquid nitrogen) ambient (room temperature) and high (400 °C) temperatures were employed.…
Pulsed excimer laser irradiation of an absorbing thin film through a transparent substrate has been employed to separate epitaxial (Pb,La)(Zr,Ti)O3 (PLZT) thin films from their MgO growth substrates. The morphology, microstructure, and dielectric properties of the laser-modified PLZT layer generated at the original PL…