Materials Literature
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It is well known that fast ionic conductivity can be obtained by doping modified oxide glasses with a metal-halide salt. The role of the dopant salt, apart from providing additional charge carriers, for the ionic conductivity has been a much debated issue. Using conductivity and density data for different host glasses…
In this paper we propose a method aiming at a quantitative study of the glass transition in a system of interacting particles. In spite of the absence of any quenched disorder, we introduce a replicated version of the hypernetted chain equations. The solution of these equations, for hard or soft spheres, signals a tra…
The influence of electron-electron scattering on quasiparticle lifetimes in graphite is calculated. In the limit when the Fermi surface is reduced to isolated points in the Brillouin zone, the suppression of screening leads to deviations from conventional Fermi liquid behavior. The inverse lifetime increases linearly…
We propose a phenomenological model which accounts for the entire sequence of subphases exhibited by antiferroelectric smectic liquid crystals. It incorporates, up to the second neighbour, both chiral and nonchiral interactions between the smectic layers. Phase diagrams are presented as functions of appropriate parame…
Transmission and reflection of Gaussian beams from a general anisotropic multilayer structure are investigated. The principal axes of the layers are oriented arbitrarily with respect to each other and with respect to a fixed reference coordinate system. The Gaussian beam is assumed to have an arbitrary angle of incide…
The effect of (gamma) and proton radiation on the optical attenuations at 980, 1300, and 1550 nm has been measured in two Lucent Technologies erbium-doped fibers (EDFs) designed for use in amplifiers pumped at 980 nm. Growth of the induced loss at the 3 wavelengths followed a power law of dose with an exponent of appr…
Abstract For corrigendum see DOI: 10.1002/anie.199628811
Abstract For corrigendum see DOI: 10.1002/anie.199721271
Adsorption of a cyclic amine ligand into a Mn-exchanged faujasite zeolite results in the formation of the corresponding amine—Mn complexes in the cavities of the zeolite. These “amine—Mn zeolites” are novel catalysts for the highly selective epoxidation of numerous olefins with H2O2. A computer model of a possible cat…
The fatigue fracture surfaces of a metallic alloy, and the stress corrosion fracture surfaces of glass are investigated as a function of crack velocity. It is shown that in both cases, there are two fracture regimes, which have a well defined self-affine signature. At high enough length scales, the universal roughness…
Rheology, dynamic mechanical properties, mechanical properties, and morphology of ethylene–propylene–diene rubber/butadiene rubber (EPDM/BR) blends with or without a homogenizing agent or a coupling agent were investigated. AAHR (a mixture of aliphatic and aromatic hydrocarbon resins) was used as a coupling agent. The…
A bulk surface photografting process which is conducted in the interface between two polymer films was designed and investigated. The bulk surface photografting is a highly efficient process. With this method, the surface of hydrophobic polymers can be made hydrophilic in less than 2 s and a grafted layer 5 μm thick c…
Reaction kinetics and viscosity rise of a liquid dicyanate ester monomer, 1,1-bis(4-cyana-tophenol)ethane, are characterized and fitted several models. Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC) are used to obtain the isothermal reaction kinetic data. The liquid dicyanat…
The regularities of the growth twin boundary behavior in Zn bicrystals under shear stress have been investigated. The aim of this work was to study the possibility of the movement of a growth twin boundary by the generation and motion of twinning dislocations. As former investigations have shown, a growth intergranula…
Recently, rare earth doped vanadates have been identified as potential successor to YAG crystals. Not much is known about the ionising radiation effect on the lasing and other properties of vanadates. Colour centres, defects, etc. formation by γ-ray irradiation in pure and Yb3+ doped YVO4, studied by thermoluminescenc…
Morphology and other characteristics of six typical pedons formed on sandstone, shale, granite and colluvium representing different landforms of Banda district of Uttar Pradesh were studied. The soils are deep to very deep, excessively to well drained, reddish brown to red, mildly acidic, low to medium in CEC, medium…
Two kinds of nano-TiO2 samples, including nano-anatase and nano-rutile, were prepared by the hydrothermal method and the gas condensation method, respectively. Results of dielectric measurements are as follows: 1. Nano-TiO2 bulk samples (anatase and rutile) exhibit much higher dielectric constant than coarse-grain sam…
Core-level shifts and core-hole screening effects in alloy formation are studied ``ab initio'' by constrained-density-functional total-energy calculations. For our case study, the ordered intermetallic alloy MgAu, final-state effects are essential to account for the experimental Mg 1s shift, while they are negligible…
The study of the Na0.5Bi0.5TiO3–K0.5Bio0.5TiO3 (NBT-KBT) system was carried out using X-ray diffraction and dielectric measurements. The limits of rhombohedral and orthorhombic solid solutions were determined, as well as the evolution of their lattice parameters as a function of composition and temperature. Dielectric…
Spectral sensitivity is an important consideration in photoconductor formulation, depending on the particular type of electrophotographic device in which the photoconductor is to be used. High sensitivity in both the near-IR and visible spectral regions would be desirable for a photoconductor used with a wide variety…