Materials Literature
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Electrical depolarization has been observed in lanthanum-modified lead titanate ferroelectric thin films stressed by nanoindentation. A spherical metallic indenter was used as a top electrode to locally pole the films and then to measure the depolarization current intensity. The current intensity had distinctive maxim…
The series of isotypic compounds V8Ga41 --> V8Ga36.9Zn4.1 --> Cr8Ga29.5Zn11.2 --> Mn8Ga27.4Zn13.6 with the V8Ga41 structure type (space group R3, Z = 3) was prepared and structurally characterised by X-ray diffraction experiments (V8Ga41: a 13.9351(5), 14.8828(12); V8Ga36.9Zn4.1: a = 13.9244(7), c = 14.8660(9): Cr8Ga2…
Fluoreszierende Flüssigkristalle: Wasserstoffbrücken zwischen Benzoesäuren und Azaaren-Rezeptorgruppen von Diazadibenzoperylen-Fluorophoren induzieren columnare flüssigkristalline Mesophasen, die stark fluoreszieren. Die Struktur eines auf diese Weise gebildeten mesogenen Übermoleküls ist im Vordergrund einer polarisa…
Good ferroelectric properties have previously been reported for both the (1−x)SrBi2Ti2O9–xBi3TiNbO9 bulk ceramics and thin films. In this work, x-ray diffraction and Raman scattering were used to investigate the effect of the incorporation of Bi3TiNbO9 into SrBi2Ta2O9 bulk ceramics and thin films. A better crystalliza…
A higher-order nonlinear dielectric microscopy technique with higher lateral resolution than conventional nonlinear dielectric imaging is investigated. The proposed scheme involves the measurement of higher-order nonlinear dielectric constants, with sensitivity to the first 0.75 nm in depth for LiNbO3 substrate surfac…
The flexible partially inverted structure of an 18-π-electron porphyrin-(1.1.1.1)-like framework is found for 21,23-ditelluraporphyrin (see structure). The dihedral angle between the plane of meso-carbon atoms and the inverted tellurophene plane in the solid state is 123.0(2)°, while in solution the porphyrin molecule…
Fluorescent liquid crystals: Hydrogen bonding of benzoic acids to azaaromatic receptor groups of diazadibenzoperylene fluorophores induces columnar liquid crystalline mesophases which are highly fluorescent. The structure of a mesogenic supermolecule generated in this way is shown on a background of a polarizing micro…
The local modification of the electronic states of highly oriented pyrolytic graphite (HOPG) surfaces using highly charged ion (HCI) irradiation has been demonstrated as a promising technique in the design of nanoscale materials. The high potential energy of HCI and subsequent surface treatment by either electron inje…
Metallofullerene nanotube peapods were prepared by introducing Dy@C82 into the interior space of single-walled carbon nanotubes. Transport measurements show that the Dy@C82 molecules function as electron donors and transfer charge to the carbon nanotube host. The amount of charge transferred varies with the temperatur…
1H NMR line-shape analysis and magnetisation-transfer experiments at variable temperature and pressure have been used to elucidate the solution dynamics of both M and m isomers of three [Eu(dota-tetraamide)(H2O)]3+ complexes. The direct 1H NMR observation of the bound water signal allows the water-exchange rates on ea…
The acid-catalyzed condensation of pyrrole and 2,5-bis(p-tolylhydroxymethyl)thiophene yields two novel giant heteroporphyrins: 5,10,15,20,25,30, 35,40-octa(p-tolyl)-41,43,45,47-tetrathia[36]octaphyrin(1.1.1.1.1.1.1.1) (S4OP) and 5,10,15,20,25,30,35,40-octa(p-tolyl)-dihydro-41,43,45,47-tetrathia[38]octaphyrin(1.1.1.1.1…
Embedded capacitor technology can improve electrical performance and reduce assembly cost compared with traditional discrete capacitor technology. Polymer–ceramic composites have been of great interest as embedded capacitor material because they combine the processability of polymers with the desired electrical proper…
The synthesis and characterization of new modified tetrathiafulvalenes (TTF), the S-position isomers of BEDT-TTF and EDT-TTF, are described. The synthetic strategy presented in this work is based on an efficient and unprecedented two-step sequence for the conversion of a vicinal bis(hydroxymethyl) functionality into a…
The structure and bonding of amorphous carbon nanowires and amorphous carbon nanowires-converted multiwalled carbon nanotubes have been investigated with carbon K-edge near-edge x-ray absorption fine structure using surface-sensitive total electron yield, and bulk-sensitive fluorescence yield. The results strongly sup…
Durch eine Eisencarbid- und Kohlenstoffhülle gegen Luftoxidation geschützt sind die nanokristallinen Eisenpartikel, die durch Sonolyse von [Fe(CO)5] in Diphenylmethan und Tempern des erhaltenen Materials hergestellt wurden. Die Sättigungsmagnetisierung des Materials (222 emu g−1, siehe Bild) ist fast so hoch wie die v…
Struktur und Energetik der Schlüsselintermediate bei der katalytischen Umwandlung von CO2 zu Methanol (siehe Bild) wurden untersucht. Die Polarität der für die Katalyse relevanten (000)-Oberfläche von ZnO führt zu unbesetzten Sauerstoffpositionen, die als Elektronenfallen die Reaktion vorantreiben. Die entwickelte Fes…
Interaction of manganese with salicylhydroxamic ligands leads to the formation of the 12-membered metallacrown [Mn(II)(2(2,4-DP)2(HCOO)2]-[12-MC(Mn(III)N(shi)-4](py)6 (2) (H-2,4-DP =2-(2,4-dichlorophenoxy)propionic acid) and the 15-membered metallacrown [Mn(II)(2,4-D)2][15-MC(Mn(III)N(shi)-5](py)6 (1) (H-2,4-D = 2,4-d…
We present a calculation of the magnetic hysteresis and its area for a model continuum spin system based on three-dimensional $({\ensuremath{\Phi}}^{2}{)}^{2}$ model with $O(N)$ symmetry in the limit $N\ensuremath{\rightarrow}\ensuremath{\infty},$ under a time-varying magnetic field. The frequency dependence of the hy…
Texture-related features of water intrusion in hydrophobised MCM-41 silicas render these materials especially suitable for energy dissipation in mechanical dampers.
It is shown that a strong but diffuse dielectric anomaly, commonly expected only in disordered ferroelectrics, may be inherent in strained and defect-free perovskite ferroelectric thin films. The origin of this unusual anomaly, which was never predicted for a defect-free system, is the overcritical trace of a critical…