Materials Literature
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Electronic absorption spectra of crystals and solutions of praseodymium and thulium acetates and dipicolinates are reported. The influence of spectral properties of both ligands on intensities of the f—f transitions in the crystals studied is discussed. In the near-IR region, overtone vibrations of ligands are strongl…
Welding of C f / SiC to Ni-based superalloy has been realized using Cu/W/Cu/W/Cu multiple interlayers. The bending strength of the joints has been improved by using the active metallic filler contacted with C f / SiC . The strength of the joints is remarkably affected by the welding temperature. The maximum value 102.…
The accuracy of the Judd-Ofelt theory is investigated in several rare earth doped glasses. Using a normalized method to fit the experimental data, we show that an average accuracy of 5 to 15% is often obtained. However, large errors (up to 35%) can be found on some transitions, even in the case of ions usually conside…
Auf der Basis des Multichromophor-Ansatzes wurde der hier gezeigte Ruthenium(II)-Komplex erhalten, der die längste bisher bekannte Lumineszenzlebensdauer aufweist (1.8 μs). Beim Multichromophor-Ansatz nutzt man eine nur geringe Wechselwirkung zwischen den vorhandenen Chromophoren, sodass deren individuelle Eigenschaft…
The phonon spectra of zinc-blende CuCl are studied as a function of pressure using density functional linear-response theory. A pressure-induced soft transverse-acoustic-phonon mode is identified. At 2.6 GPa, the TA phonon mode softens at the X point, initiating the phase transition from the zinc-blende structure CuCl…
We demonstrate the applicability of continuous electropolishing for the preparation of metal tapes for ion-beam assisted deposition of MgO for the fabrication of in-plane textured template layers. These templates are used for the fabrication of second generation high temperature superconducting wires utilizing YBa 2 C…
We report on the electrical properties of thermally oxidized p-GaN metal–oxide–semiconductor (MOS) diodes with n+ source regions fabricated on sapphire substrates. The n+ regions were selectively produced in Mg-doped GaN by Si+N coimplantation and subsequent annealing at 1300 °C, and then 100-nm-thick β-Ga2O3 was grow…
Vom einen Spin zum andern: Bei dem durch Eintopfreaktion erhältlichen [FeIIH3L][FeIIIL](NO3)2 (H3L=sechszähniger Tripod-Ligand mit drei Imidazolgruppen) handelt es sich um eine homochirale gemischtvalente Spin-Crossover-Verbindung bestehend aus zweidimensionalen geordneten Schichten, die durch Imidazol-Imidazolat-Wass…
The theory of multiphonon vibronic coupling to electronic transitions is applied in analysing fluorescence spectra of Eu2+ in BaFCI, which consist of the 4f7(6P7/2,) → 4f7(8S7/2) and 4f65d → 4f7 transitions, and the 4f7-4f65d excitation spectrum of Ce3+ in YPO4. The 4f electrons are weakly coupled to lattice vibration…
A local segmental mobility was determined by electron spin resonance (ESR) spin-label method for a series of polystyrene (PS) with various molecular weights. Each PS specimen was selectively spin-labeled with stable nitroxide radicals at a chain end or inside sites. Molecular motion at the inside of the chain was comp…
This review revolves around the question which general distribution of scatterers (in a Euclidean space) results in a pure point diffraction spectrum. Firstly, we treat mathematical diffration theory and state conditions under which such a distribution has pure point diffraction. We explain how a cut and project schem…
This paper describes a photon-counting study of the cavitation luminescence produced by flow over a hydrofoil. This has previously been identified in water saturated with xenon. The four objectives of this study are: to determine whether luminescence can be obtained using air-saturated water; to quantify this emission…
The stability of charge ordered phases of bismuth based ${\mathrm{Bi}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ and ${\mathrm{Bi}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{MnO}}_{3}$ oxides is investigated by magnetization measurements in magnetic fields up to 130 T. Marked differences exist when comparing the critical fie…
We have developed a multicomponent K–Er codoped silica-based sol-gel glass that presents high luminescence quantum yield (∼100 times larger than that of an Er-doped silica sol-gel glass) and long emission lifetime at 1.54 μm (17 ms). The glass was heat treated to melting temperature with the optical properties of the…
In this letter, we report a process for room-temperature assembly of patterned and periodic structures of carbon nanotubes (CNTs). Well-defined patterns with less than a 10-μm linewidth and variable thickness were readily deposited. The CNTs show long-range in-plane orientation ordering and adhere strongly to the subs…
We used a broadband, free-space, focused-beam system to measure the transmission and reflection in left-handed-material (LHM) slabs. The samples were made of alternating patterns of copper wires and split-ring resonators on Rogers 5880 substrates separated by Rohacell™ spacers. The measured data show very good agreeme…
A novel Gd(III) complex, GdDOTA-(BOM)4, has been prepared by a simple three-step procedure. The complex showed high T1-relaxivity values in serum albumin solutions, blood and plasma, resulting from high affinity for serum albumin. The T1-relaxivity in plasma, 67.4 s-1 mM-1 (20 MHz, 37 degrees C), makes it a promising…
The conversion of electrical energy into mechanical work plays an important role in robotics. In his Perspective, Baughman discusses new materials that may be used as actuators. He highlights the report of Weissmueller et al., who show how nanostructured platinum might eventually be used as electrochemical actuators t…
The absorption spectra of a series of compounds of the type [Mo(2)(DAniF)(3)](O(2)CXCO(2))[Mo(2)(DAniF)(3)] (DAniF = N,N '-di-p-anisylformamidinate) have been measured and revealed a strong dependence of the electronic transitions and, therefore, the colors upon the chemical nature of the dicarboxylate linker. The mor…
We have developed a novel method for site-selective deposition (SSD) of thin films using a seed layer. The deposition process of anatase TiO 2 from an aqueous solution was evaluated in detail using a quartz crystal microbalance, and it was found that the nucleation and initial growth of anatase TiO 2 were accelerated…