Materials Literature
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Accurate charge-density distributions of cubic and tetragonal ${\mathrm{PbTiO}}_{3}$ and ${\mathrm{BaTiO}}_{3}$ have been obtained by the MEM(maximum entropy method)/Rietveld analysis using synchrotron-radiation powder data. The Pb-O bonds in tetragonal ${\mathrm{PbTiO}}_{3}$ show rather strong covalency, while those…
Author: Zhang, J. X. et al.; Genre: Journal Article; Issued: 2001-11-19; Keywords: MPI für Intelligente Systeme; Abt. Schütz; ; Title: The coercivity of the melt-spun Sm-Fe-Ga-C permanent magnets and the effect of additives (Nb, Cu and Zr)
Boron carbide thin films were grown by mass selected ion beam deposition using low energy B11+ and C12+ ions at room temperature. The amorphous films exhibit any desired stoichiometry controlled by the ion charge ratio B+/C+. Films with a stoichiometry of B4C showed the optimal combination of a high mechanical strengt…
A cluster glass structure has been observed to occur in nanohybrids consisting of zinc ferrite in an amorphous silica matrix. Such a unique cluster glass structure has been supported by studies of x-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, and magnetic characterizatio…
Activated carbon (AC) powder as an active electrode material and open-pore nickel foam as a current collector material were used for an electric double layer capacitor (EDLC) with an aqueous electrolyte of KOH mixture. The electrochemical characteristics of the EDLC being made of 3 cm by 3 cm electrode size were inves…
The interfacial width between immiscible low-molecular-weight polymer pairs was investigated using neutron reflection. Deuterated polystyrene (d-PS) and poly(methyl methacrylate) (PMMA) polymers of very low molecular weight ( Mw ) were used. The interfacial width is seen to increase for the low-molecular-weight cases…
We report the 100% correlation between polarized light microscopy (PLM), piezoresponse force microscopy (PFM), and micro-Raman spectroscopy when investigating domain-rich ferroelectric systems. In order to allocate the desired spot on a submicrometer scale, both PLM and PFM were combined to elucidate the effective thr…
Infrared-to-visible upconversion obtained under continuous-wave infrared laser excitation has been investigated in Pr 3+ -doped chalcohalide glasses for different halide (Cl, Br, I) modifiers and Pr 3+ concentrations. The excitation wavelength dependence suggests two different upconversion mechanisms. When the excitat…
X-ray-absorption near edge structure (XANES) measurements have been performed to investigate the local electronic structures of the Fe-catalyzed and stabilized carbon nanotubes (CNT) with various diameters. The intensities of the π*- and σ*-band and the interlayer-state features in the C K-edge XANES spectra of these…
Durch Addition von Nitrenen, Carbenen oder Radikalen gelingt die Herstellung löslicher, einsträngiger Kohlenstoff-Nanoröhren (gezeigt ist hier das carbenfunktionalisierte Addukt), deren Charakterisierung – ein zentrales Problem in der Nanoröhrenchemie – einfach und unproblematisch ist.
The lattice location of phosphorus dopant atoms in n-type homoepitaxial diamond {111} films grown by chemical-vapor deposition has been investigated by Rutherford backscattering spectrometry and particle-induced x-ray emission under ion-channeling conditions. It is found that phosphorus dopant atoms occupy the substit…
Individual dendritic branches can solubilise hydrophilic dyes in apolar media. The functional group at the focal point of the dendritic branch plays a key role in the dye uptake process. Supramolecular interactions between carboxylic acid and amine groups have been shown to be effective in enabling efficient solubilis…
An isomeric family of eighteen triisopropylsilyl-capped phenylene ethynylene pentamers (molecular formula C60H62Si2) has been prepared by using fast parallel synthesis, for organic electroluminescence. Each pentamer was grown on a polymer support of propylaminomethylated polystyrene by using a series of palladium-cata…
Oxoanionen der p- und d-Block-Elemente wie SiO44−, PO43−, SO42− und CrO42− sind weit verbreitet. Der vollständige oder teilweise Ersatz der Oxogruppen durch isoelektronische Imidogruppen (NR) führt zu homoleptischen Polyimido-Anionen [E(NR)x]z− bzw. heteroleptischen Imidooxo-Anionen mit der allgemeinen Formel [OyE(NR)…
The structural, optical and mechanical properties of orthorhombic ternary nitride crystals have been analysed theoretically with first-principles calculation. Our results indicate that these nitrides possess fairly large optical bandgap (4-6 eV), second-order nonlinear optical susceptibility (13-18 pm V -1 ), and bulk…
At U <1 V nearly the entire voltage in liquid crystals (LC) and in solutions of dyes in LC is applied to the near-electrode regions. In this range of voltages, the Schottky emission through a dielectric layer is the electric current flow mechanism transport. A thin (several nanometres) dielectric layer is formed throu…
Vier ausgehöhlte PW9O349−-Ionen (siehe Bild, blaue Polyeder) werden in den Heteropolyoxometallaten [(PM2W10O38)4(W3O14)]30− (M=Y, Eu) durch acht MIII-Ionen und sieben W-Atome zusammengehalten, welche zusammen ein [M8W7O30]6+-Gerüst aufbauen (Bildmitte). Im Festkörper besteht eine starke Wechselwirkung zwischen den Ani…
Upon continuous wave excitation around 1 μm, a YVO4 crystal codoped with ytterbium and holmium exhibits intense red emission originating in the F55 level and considerably weaker green emission originating in the S52 level of Ho3+. The ratio of the red to green emission intensities is 17:1 at 300 K. The dependence of t…
Nanoporous silica thin films with low dielectric constants were deposited by gas evaporation of SiO2 nanoparticles in an argon atmosphere. With increasing gas pressure during the evaporation, the dielectric constant decreases, while the porosity increases. The correlation between the dielectric constant and porosity i…
Polydentate bridging ligands can be used to link small polyoxo-alkoxo-metalate units to form supramolecular clusters. In the title compound, twelve μ4-bridging squarato groups connect eight trinuclear methoxo-oxo-vanadate units to form a tetradodecanuclear cubic framework (see picture), in whose cavity six n-butyl gro…