Materials Literature
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The present article reviews the feasibility of electrochemical noise (ECN) measurements as a corrosion probe for monitoring corrosion changes on stainless steel 304L (UNS 30403). Controlled tests for ECN and weight lossmeasurements were conducted in 10% NaCI solution for stainless steel 304L (UNS 30403). Corrosion beh…
Abstract The oxidation of (Pb,Ge)Te crystal surfaces at ambient temperature and humidity was studied by means of XPS in a time range from minutes to months. Vacuum‐cleaved crystal was used for the experiment. It was found that Ge in a PbTe lattice occupies two different positions. At one of them, donor behaviour is re…
Temperature dependences of the dielectric permittivity of betaine phosphite crystals are studied both without and under application of an electric bias. It is shown that, in view of the fact that the high-temperature improper ferroelastic (antiferrodistorsive) phase transition at T c 1 =355 K is nearly tricritical, th…
LN Brewer, MA Othon, LM Young,, TM Angeliu; Misorientation Mapping for Visualization of Plastic Strain Via Electron Back-Scattered Diffraction, Microscopy
The crystal structure of priceite, data and refined to Rwp = 0.042 and Rp = 0.030 using the Rietveld method. The monoclinic structure was refined in space group P21/c, a 11.623(1), b 6.976(1), c 12.350(1) Å, β 110.70(1)°, V936.72(1) Å3, Z = 4. The structure consists of infinite chains of pairs of borate rings that ext…
Abstract. The mechanical alloying behavior of magnesium with some transition and non-transition elements has been investigated. The structural changes during mechanical alloying were monitored by X-ray diffraction analysis. Mechanical alloying of Mg with transition metals V or Nb does not form alloys, and the solubili…
An electron-spin-resonance study of ferrimagnetic MnCr2S4 single crystals revealed a positive cubic magneto-crystalline anisotropy at temperatures below the Curie temperature TC (64.5 K). A large difference (∼2.5 kOe) was found between the resonance fields for the 〈001〉 and 〈111〉 axes at 4 K. The anisotropy constants…
Abstract Boron nitride thin films have been deposited on silicon by tuned substrate r.f. magnetron sputtering from a sintered hexagonal BN target using a mixture of Ar (90%) and N 2 (10%) as sputtering gas at different substrate bias conditions. The deposited films have been characterized by Fourier transform infrared…
Abstract Dynamic segregation phenomena were revealed by XPS during the oxidation of some ferrites (Fe 2.5 Ti 0.5 O 4 , Fe 2.5 Ni 0.5 O 4 , Fe 2 CrO 4 and FeCr 2 O 4 ). This kind of phenomenon induces, at a low temperature (below room temperature), drastic changes in the cationic composition of the most external layers…
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…