Materials Literature
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This paper reports on an EPR study of LaAl1−x NixO3 solid solutions with x≤0.12 made in the 4.2-to 300-K temperature range. In the X range, the broadening of the single EPR line with g eff=2.148 was observed at temperatures below ∼40 K. In the Q range, a slightly anisotropic EPR line with g ⊥ ′ =2.145±0.002 and g ‖ ′…
A new analysis of electronic transport in chalcogenide glasses, based on bipolaron hopping in the extended pair approximation, is presented. It is assumed that the relaxation time of the carrier when hopping has a Meyer-Neldel type of temperature dependence instead of a simple activated form. In this way, the experime…
Hydrogen permeation through steel plate maintained at various constant temperatures between 20 and 500°C was investigated using the hydrogen collection method. Fused salts were employed at elevated temperatures. Hydrogen entry was induced by step changes in cathodic charging current density. Emanating flux transients…
Temperature dependences of the Hall coefficient R , electrical conductivity σ, and thermopower α 0 are investigated in the range of 4–300 K. The specific features observed in temperature dependences R ( T ), σ( T ), and α 0 ( T ) are interpreted in the context of a model with two types of charge carriers.
Crystal structures of stoichiometric gladite (empirical formula Cu1.32Pb1.37Bi6.65S12.03) and krupkaite (empirical formula Cu2.00Pb2.03Bi5.99S12.04) from Felbertal, Austria, were refined to R1 = 0.045 and 0.037, respectively, yielding improved positional parameters and interatomic distances. Structures of “oversubstit…
Superconducting characteristics such as the Meissner–Ochsenfeld state, screening supercurrents and hysteresis loops of type II superconductors were observed from the temperature and magnetic field dependences of the magnetic moment m(T,H) in graphite powders reacted with sulphur for temperatures below 9.0K. The temper…
Abstract Several alkali germanate glasses of molar composition (100 − x )GeO 2 · x M 2 O (M = Na, with 0 ⩽ x ⩽ 35, or M = Cs, with 0 ⩽ x ⩽ 30) were prepared by melting, and their XPS spectra were recorded and analysed as a function of the alkali content. The simultaneous presence of bridging oxygen (BO) and non‐bridgi…
Velocity fluctuations and hydrodynamic dispersion are studied in a monodisperse dilute suspension of rigid spherical particles. In the absence of Brownian motion and inertia, fluctuations in the velocity of individual particles arise from hydrodynamic interactions varying with the ever-changing configurations of the p…
The absorption and excitation spectra of trivalent transition metal V3+ ions doped in LiGaO2 and LiAlO2 oxide crystals are measured by Kück and Jander [Opt. Mater. 13, 299 (1999)]. These spectra have provided evidence of the occurrence of transitions from the 3A2(3F) ground state to the crystal-field split levels 3T2(…
While it is well known that introduction of Pro residues into the interior of protein alpha-helices is destabilizing, there have been few studies that have examined the structural and thermodynamic effects of the replacement of a Pro residue in the interior of a protein alpha-helix. We have previously reported an incr…
Abstract A series of interpenetrating polymer networks (IPNs) based on carboxylated nitrile rubber (XNBR) and poly(alkyl methacrylate)s such as poly(methyl methacrylate) (PMMA), poly(ethyl methacrylate) (PEMA) and poly(butyl methacrylate) (PBuMA) were synthesized. The compositions of the IPNs were also varied by chang…
Abstract Carbon black‐filled high‐density polyethylene (HDPE)/ethylene ethylacrylate copolymer (EEA) blends were prepared and the effect of crosslinking of the blends on the positive temperature coefficient (PTC) stability was investigated. By irradiation and silane‐crosslinking methods, crosslinked composites with va…
Abstract Conductive adhesives, based on highly filled silver particles dispersed in a liquid epoxy resin, with an aliphatic amine [diethyltriamine (DETA)] as a curing agent, were investigated. A third component was added to the epoxy/Ag system to obtain composites of better conductivity, or similar conductivity but at…
Thermally induced semiconductor-metal phase transitions taking place in Al/VO 2 /insulator and VO 2 /insulator film systems upon recording optical data are investigated. Experiments show that the rate of the processes depends on thermophysical parameters of the films, as well as on the energy exposure. The dynamic ran…
We show that a polygonization of the crystal (formation of grain subboundaries) takes place during the growth in thin-sample directional solidification of a transparent nonfaceted alloy at solidification rates lower than the cellular-bifurcation threshold. We give experimental evidence that this phenomenon is due to a…
Xiaodong Tao, Alwyn Eades; Alternatives to Image Quality (IQ) Mapping in EBSD, Microscopy and Microanalysis, Volume 8, Issue S02, 1 August 2002, Pages 692–693,
Abstract The deposition of stoichiometric V 2 O 5 films for abrasion‐resistant V 2 O 5 /TiO 2 anatase catalysts was investigated. Direct current magnetron sputtering from ceramic oxide targets in an argon/oxygen atmosphere was chosen as the deposition technique. Layers were prepared with different oxygen mole fraction…
Abstract The effect of manganese pretreatment on the corrosion behaviour of AA6061 T6–10% Al 2 O 3 metal–matrix composite was investigated in aerated aqueous 3.5% NaCl solution using electrochemical impedance spectroscopy (EIS). The corrosion inhibition characteristics were studied for two series of manganese‐pretreat…
The scattering phenomenon from an arbitrary-shaped end of a asymmetrical slab waveguide for the cases of TE and TM guided modes is simulated by means of boundary integral equations that are called guided-mode extracted integral equations. The integral equations that we derive can be solved by the conventional boundary…
A dense (>98% theoretical density), residual‐stress‐free m‐ZrO 2 /40 vol% nickel composite with K I C ∼ 5.4 MPa·m 1/2 and ς f ∼ 225 MPa has been obtained using a simple wet processing route and subsequent sintering at 1430°C in a 90% argon/10% hydrogen atmosphere. The mechanism for release of internal stresses by t…