Materials Literature
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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…
An efficient approach to composite film fabrication that involves the control of doping processes between soluble multiwalled nanotubes (s-MWNTs) and polyaniline (PAN) molecules has been developed in this work. The s-MWNTs were prepared by introducing carboxylic acid and sulfonic acid groups to the surfaces of nanotub…
In terms of the symmetry of single-walled carbon nanotubes, we present a two-atom unit cell model to study the lattice dynamics and the thermal properties. Different behavior of size dependence of specific heat is found at different temperature. At low temperature, it is found that the specific heat is proportional to…
We have studied the structural modifications related to the charge-orbital ordering for single-layered manganites ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{1+x}{\mathrm{MnO}}_{4}$ with both commensurate and incommensurate doping levels $(0.55\ensuremath{\leqq}x\ensuremath{\leqq}0.75).$ High-resolution electron m…
In this study, we investigate the effect of ultrasound on the dewaterability of sewage sludge. The investigation involves laboratory experiments, which were conducted under a broad range of conditions, including energy levels of ultrasonic waves, treatment time, and pH. Results of the study show that ultrasound enhanc…
We have investigated the permeability at microwave frequencies of Y-type hexaferrites in zero-magnetic field. The permeability was measured from 0.045 to 10 GHz and it was correlated with multidomain and domain-wall resonances in zero-magnetic field. The basal plane anisotropy field, HφA, magnetic remanence, 4πM, doma…
ESR measurements have been performed on quasi-one-dimensional iodo-bridged diplatinum complexes (MMX-chains) Pt 2 (RCS 2 ) 4 I (R = n -butyl ( 1 ) and n -pentyl ( 2 )) in the temperature range between 4 K and room temperature. Both complexes show a steep drop in spin susceptibility at approximately 210 K, caused by th…
We performed studies of electron emission from ultrananocrystalline diamond (UNCD)-coated, ungated silicon field emitters as a function of in situ exposure to various gases during current versus voltage and current versus time measurements. The emitter arrays were fabricated by a subtractive tip fabrication process an…
Acoustic vibrational modes are derived for both zigzag and armchair nanotubes of finite length using the continuum theory and a variational solution of Donnell’s equation. Calculations of both even and odd modes of the displacement are performed. The dispersion relations are shown to vary with the length of the tube a…
This study revealed that Ga and N co-doped ZnO films show an increase of solubility limits of N concentration through heavy doping with Ga; this is the “ co-doping effect ” proposed by Yamamoto and Yoshida [Jpn. J. Appl. Phys. Part 2 38 (1999) L166]. The N concentration increased linearly from 10 18 to 10 19 cm -3 whe…
Der langlebige ladungsgetrennte Zustand in SWNT.−Fc.+ entsteht als Folge eines photoinduzierten Elektronentransfers im neuartigen einwandigen Kohlenstoffnanoröhren-Ferrocen-Hybrid SWNTFc (siehe Bild). Das Vorliegen von SWNT.− wurde durch Laser-Flashpyrolyse entdeckt und durch zeitauflösende Pulsradiolyse sowie Stead…
Liquid crystals used in electronic displays usually contain small amounts of ions that move under the influence of the varying applied electric field. It is well known that the motion of ions perpendicular to the substrates may lead to modified electric fields resulting in image sticking effects. During operation, the…
We present photoelectron (PE) and x-ray absorption spectra (XAS) of macroscopically aligned multiwalled carbon nanotubes. We identify the peaks in the valence PE spectra with regions of high density of states through comparison to calculations for graphite. Finally, we outline and illustrate a simple method for using…