Materials Literature
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The reaction of the mixed-valent metal triangles [Mn(3)O(O(2)CR)(6)(py)(3)] (R = CH(3), Ph, C(CH(3))(3)) with the tripodal ligands H(3)thme (1,1,1-tris(hydroxymethyl)ethane) and H(3)tmp (1,1,1-tris(hydroxymethyl)propane) in MeCN, produces a family of manganese rodlike complexes whose structures are all derived from a…
In this paper we present an approach aimed at performing many-body calculations of Born-effective charges of crystalline insulators, by including the electron-correlation effects. The scheme is implemented entirely in the real space, using Wannier-functions as single-particle orbitals. Correlation effects are computed…
A novel scanning tunneling microscope manipulation scheme for a controlled molecular transport of weakly adsorbed molecules is demonstrated. Single sexiphenyl molecules adsorbed on a Ag(111) surface at 6 K are shot towards single silver-atoms by excitation with the tip. To achieve atomically straight shooting paths, a…
We report on the fabrication and characterization of single crystal field-effect transistors (FETs) based on diphenylbenzo diselenophene (DPh-BDSe). These organic field-effect transistors (OFETs) function as p-channel accumulation-mode devices. At room temperature, for the best devices, the threshold voltage is less t…
A grid-based real-space implementation of the Projector Augmented Wave (PAW) method of P. E. Blochl [Phys. Rev. B 50, 17953 (1994)] for Density Functional Theory (DFT) calculations is presented. The use of uniform 3D real-space grids for representing wave functions, densities and potentials allows for flexible boundar…
Cold neutron scattering experiments have been performed to explore the energy, temperature, and wave-vector dependence of the diffuse scattering and the transverse acoustic (TA) phonons in the relaxor $\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}$. We have observed a weak diffuse scattering cros…
The Surface Evolver was used to compute the equilibrium microstructure of dry soap foams with random structure and a wide range of cell-size distributions. Topological and geometric properties of foams and individual cells were evaluated. The theory for isotropic Plateau polyhedra describes the dependence of cell geom…
Quantum-well (QW) states in {\it nonmagnetic} metal layers contained in magnetic multilayers are known to be important in spin-dependent transport, but the role of QW states in {\it magnetic} layers remains elusive. Here we identify the conditions and mechanisms for resonant tunneling through QW states in magnetic lay…
Surface functionalization of the solid heteropolyacid H3PW12O40 with a bulky PEG-containing quaternary ammonium cation through partial proton exchange leads to a polyoxometalate-based liquid salt with high-temperature proton conductivity ( approximately 10-3 S cm-1 at 140 degrees C) under dry conditions. The proton co…
Nanocrystalline cerium oxide based powders (CeO 2, (GdO 1.5 ) 0.2 (CeO 2 ) 0.8, and (SmO 1.5 ) 0.2 (CeO 2 ) 0.8 ) have been produced using combustion synthesis with glycine as fuel and nitrate as oxidizer. The pure CeO 2 powders prepared by using different glycine-to-nitrate ratios have been characterized by X-ray dif…
Ge(2)Bi(2)Te(5) in the GeTe-Bi(2)Te(3) pseudobinary system has two single-crystalline phases: a metastable phase with an NaCl-type structure and a stable phase with a nine-layer trigonal structure. In the metastable phase, the structure consists, in the hexagonal notation, of infinitely alternating stacks of Te and Ge…
The dielectric properties of $\mathrm{Ca}{\mathrm{Cu}}_{3}{\mathrm{Ti}}_{4}{\mathrm{O}}_{12}$, a material showing colossal values of the dielectric constant, were investigated over a broad temperature and frequency range extending up to $1.3\phantom{\rule{0.3em}{0ex}}\mathrm{GHz}$. A detailed equivalent-circuit analys…
A universal conduction model is proposed for high-voltage direct-current (HVDC) insulation materials. The model is able to reproduce many well-known experimental facts and is very useful for finite-element electro-thermal simulations required in the design process of HVDC cables and cable-accessories. The proposed mod…
Butyl acrylate resin–iron chelate was prepared by cross-linking with divinyl benzene and complexation with ferric chloride. The prepared resin was incorporated in different amounts into low-density polyethylene samples filled with magnesium hydroxide. Flammability properties were evaluated by cone calorimetry and ther…
Aim of this paper is to validate the effectiveness of an artificial intelligence technique devised for tree diagnosis in solid insulation systems. For this purpose, electrical and optical partial discharge (PD) measurements were carried out on specimens containing treed regions of different typologies ("bush" and "bra…
The common use of zinc oxide varistors has brought about qualitative changes in the overvoltage protection of electronic and electric power equipment. This is due to the special properties of ZnO varistors, mainly the high current-voltage characteristic nonlinearity and the capacity to withstand strong current surges.…
For the operation programs and preventive maintenance a fundamental focus is to monitor the efficiency of components of a distribution system. A right goal for the maintenance is the evaluation of synthetic parameters suitable to furnish, after each measuring time interval, the updated check up of the maintaining comp…
The effect of accelerated aging by immersion in boiling water on the tensile behavior of a hybrid ramie-cotton fabric polyester composite was evaluated. Under these conditions, fast water absorption by the lignocellulosic fibers took place, causing a sharp reduction in the tensile strength of the composite during the…
Two kinds of rubber composites were prepared by melt mixing of acrylonitrile-butadiene rubber (NBR) with zinc dimethacrylate (ZMA). In one system ZMA was added in the form of powder; and, in another system, the ZMA was prepared by in-situ reaction of ZnO and methacrylic acid (MA) during melt mixing. Both systems showe…
Time‐resolved laser‐induced fluorescence spectroscopy (TRLFS) was employed to determine the inner‐sphere (i.e., first coordination sphere) hydration number (N H2O) of lanthanide(III) ions (Ln = Sm, Eu, Tb, and Dy) in the TRPO‐dodecane/HNO3 (or HNO3–NaNO3) system under various conditions. In addition, the N H2O of Ln(I…