Materials Literature
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We have used positron annihilation spectroscopy to study the introduction and recovery of point defects in electron-irradiated $n$-type ZnO. The irradiation (${E}_{\mathrm{el}}=2\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$, fluence $6\ifmmode\times\else\texttimes\fi{}{10}^{17}{\mathrm{cm}}^{\ensuremath{-}2}$) was performe…
Abstract Nanoislands have been fabricated on the surface of conducting poly(3,4‐ethylenedioxythiophene) (PEDOT) films doped with poly(4‐styrenesulfonate) (PSS) using high‐energy (≈ 1–3 MeV) Cl 2+ ion irradiation. Scanning electron microscopy and atomic force microscopy confirm the direct formation of nanoislands with…
We report an analytical study of thermally activated motion of perfect dislocation loops with high mobility in terms of an elastic model, where the dislocation loops are assumed to be smooth flexible strings under the influence of a potential barrier. The activation energy and saddle point configuration of the disloca…
Nanostructured lanthanum cobaltite thin films have been grown on silica substrates by hybrid chemical vapor deposition/sol-gel approaches. The refractive index and the extinction coefficient of the specimens have been determined in the spectral range of 0.75–6.5 eV by spectroscopic ellipsometry. The conductivity of th…
We have measured polarized x-ray-absorption near-edge structure and extended x-ray-absorption fine structure spectra at the Mn $K$ edge on ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{1+x}\mathrm{Mn}{\mathrm{O}}_{4}$ samples with $x=0$, 0.3, and 0.5 at different temperatures from $50\phantom{\rule{0.3em}{0ex}}\math…
In electronic many-particle systems, the mapping between densities and spin magnetizations, ${n(\mathbf{r}),\mathbf{m}(\mathbf{r})}$, and potentials and magnetic fields, ${v(\mathbf{r}),\mathbf{B}(\mathbf{r})}$, is known to be nonunique, which has fundamental and practical implications for spin-density-functional theo…
Two new alkali metal borophosphates, K3[BP3O9(OH)3] and Rb3[B2P3O11(OH)2], were synthesized by applying solvothermal techniques using ethanol as solvent. The crystal structures were solved by means of single-crystal X-ray diffraction (K3[BP3O9(OH)3], monoclinic, C2/c (No. 15), a = 2454.6(8) pm, b = 736.3(2) pm, c = 14…
An eggshell finish: Designed peptides can be used as a tool to unravel the structure–activity relationships of eggshell matrix proteins. The ordered arrangement of doublets of charged residues on the peptide and its self-assembling characteristics play a key role in the biomimetic nucleation of polycrystalline calcite…
The effects of Ta barrier thickness on electromigration reliability of dual-damascene Cu/porous methylsilsesquioxane interconnects were investigated. With decreasing Ta barrier thicknesses, the threshold product of current density and line length (jL)c was found to be reduced due to less structural confinement from th…
Abstract This study demonstrates the first observation of energy transfer from the doublet state of the nitronyl nitroxide radical ligand in Ln III complexes, exerting the light‐harvesting antenna effect on the NIR luminescence for the first time. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Abstract An overview of recent density‐functional‐based studies on the structure, surface structure and electronic and optical properties of CdS, CdSe and CdS/CdSe semiconductor nanoparticles is given. In particular, the effects of organisation, embedding and surfactants on the properties of these particles are discus…
Binuclear complexes of cobalt(III) have been prepared with 3,3',4,4'-tetrahydroxy-benzaldazine (H4thB), 3,3',4,4'-tetrahydroxy-5,5'-dimethoxybenzaldazine (H4thM), and 3,3',4,4'-tetrahydroxydimethylbenzaldazine (H4thA) as bis(catecholate) ligands that link metal ions separated by 16 A through a conjugated bridge. In on…
The structural and electronic properties of fully-relaxed $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}(001)$ surfaces with oxygen vacancies are investigated by first-principles calculations. The large displacements of ions deviated from their crystalline sites to lead to the formation of the surface rumpling have been obta…
The salt [K(18-crown-6)][Mn(H2O)2Cr(ox)3.0.5(18-crown-6) (1) has been prepared and structurally and magnetically characterized. It crystallizes in the P2(1)/c space group [a = 21.011(2) A, b = 11.265(2) A, c = 15.748(3) A, beta = 105.952(6) degrees , V = 3584(1) A3, and Z = 4] and contains [Mn(H2O)2Cr(ox)3]infinity ch…
In Minutenschnelle: Die hydrothermale Bildung von faserförmigem MoO3 wurde mit komplementären In-situ-Methoden verfolgt. Die In-situ-EDXRD-Untersuchungen zeigen, dass die quantitative Bildung innerhalb weniger Minuten beendet ist (Bild: zeitaufgelöste Pulverdiffraktogramme bei 120 °C). Eine speziell konstruierte In-si…
The H 3 PW 12 O 40 and H 4 SiW 12 O 40 heteropolyacids supported on silica were studied by 1 H MAS NMR as a function of both the coverage and the dehydroxylation temperature. The signal at ca. 8 ppm attributed to the highly acidic protons of the anhydrous form of the heteropolyacid was never observed in the case of th…
Formula unit volume, Vm, has recently been identified as the key link to a number of thermodynamic functions and has given rise to an alternative approach to thermodynamics for modern inorganic materials (volume-based thermodynamics, VBT). In an earlier publication, we reported over 400 ion volumes for commonly encoun…
Micropatterns of silica on a gold substrate were generated by a biomimetic approach, namely, the biosilicification of silicic acids. The procedure consists of three simple steps: pattern generation of a polymerization initiator, (BrC(CH(3))(2)COO(CH(2))(11)S)(2), by microcontact printing; surface-initiated, atom-trans…
PVC is the most common insulation material used for wiring in low-voltage (LV) service. ‘Low-voltage’, in the context of this paper, is taken to be 120–240 VAC. The electrotechnical products considered include insulated wires, cables and cords, and also appurtenant termination devices, e.g. male plugs or female taps.…
Used in the preparation of Si3N4 components, rare-earth elements promote the growth of needlelike grains essential to elevated toughness; evidently, La is significantly more effective than Lu. To explore this difference, we determine the three-dimensional organization of rare-earth atoms in the amorphous phase near pr…