Materials Literature
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Measurements of long-term dimensional stability on test samples of the glass ceramic "Zerodur", published earlier, are interpreted as a consequence of a diffusion process in the amorphous areas of the glass ceramic. The time-functions derived on the basis of this model can be fitted to the observed length variations w…
Multilayer Barium Strontium Titanate (BST) sol-gel films with molar formula BaxSr1-xTiO3 (x = 0.5, 0.7 and 0.8) are deposited on SiO2/Si substrates. The surface morphology and grain size are characterized via Atomic Force Microscope (AFM), showing the films to be uniform and crack-free
The lateral motion of 180-degree domain walls in ferroelectrics is considered. The motion is realized by the thermofluctuational nucleation and subsequent spreading of the reverse domain nucleuses on the domain wall. The energy and the velocity of the lateral walls of nucleus for different orientations, energies and d…
Whereas irradiation of a mixture of a naphthol (or its methyl ether) and acetylacetone with excitation of the naphthol component leads to no reaction, irradiation of a similar mixture with excitation of the acetylacetone component leads to its cycloaddition to the naphthalene derivative to give a cyclobutane as the pr…
Although plasticity of metals is complicated due to the string-like nature of its elementary units, the dislocations, it is currently tried to understand various stability aspects of plasticity. Of special interest are the dislocation distributions after cyclic loading ("fatigue"). Well developed periodic patterns are…
An annealed-and-aged ferritic steel containing fine NbC precipitates and relatively coarse particles of Laves phase was bombarded with 4-MeV iron ions to 100 displacements per atom (dpa) at 400 to 600°C. Much of the damage structure consisted of dislocation tangles that coarsened with increasing temperature. Cavity fo…
The long-term marine corrosion performance of commercially pure aluminum, commercially pure zinc, two layered zinc-aluminum, and two zinc-aluminum coatings on steel substrates was evaluated. The investigation consisted of marine exposures and an electrochemical evaluation of coating polarization behavior. Corrosion ex…
An investigation of the oxygen-deficient phase SrFe1–xCoxO3–y has been carried out using 57Fe Mössbauer spectroscopy and X-ray powder diffraction. Samples prepared under identical conditions show an increase in y as x increases. For x⩽ 0.2 the solid solutions are tetragonally distorted perovskites and show the same de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal effects on the behavior of electrons trapped in aqueous solid clathratesZ. P. ZagorskiCite this: J. Phys. Chem. 1987, 91, 3, 734–739Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 January 1987https://pubs.acs.…
Two classes of liquid crystals of good chemical stability are discussed, which are characterized by high response speed. The epoxy compound have a fairly high spontaneous polarization, 30 nC cm−2, whereas the lactic ethers show the somewhat lower values of 10 and 14 nC cm−2. Tilt angle, polarization, and viscosity mea…
Quantitative study of the protonation and deprotonation equilibria of meso-tetra-(p-sulphonatophenyl)porphyrin, H2TPPS4–, as well as the formation equilibria of the Cu2+ and Zn2+ complexes, in a Me2SO-water (80 : 20) solution, has allowed us to determine for the first time the stability constants of two metalloporphyr…
Adsorption characteristic of the silver nitrate impregnated silica gels developed for radioiodine was examined. The effects of various operating condi-tions on decontamination factors and adsorption capacities of elemental iodine and methyl iodide were investigated. Results show that this sorbent has good adsorption c…
Changes in shape of internally pressurized tubes caused by operating temperatures and pressures are enhanced by fast neutron irradiation. Lengths and diameters of Zr-2.5 wt% Nb pressure tubes in CANada Deuterium Uranium-Pressurized Heavy Water (CANDU-PHW) power reactors and test reactors have been monitored periodical…
The existence of a sharp transition of high-temperature creep behavior in bcc solid solutions has been confirmed by studying steady-state creep characteristics of an Fe-2.1mol% (3.56mass%)Mo alloy in the temperature range T from 1 100 to 1200K under the tensile stress range a from 4 to 50MPa. In the lower stress regio…
Abstract Digital image acquisition is of great interest in SEM, as can be proven by the number of ways in which images can be improved by processing with this technique ( Desai and Reimer 1985, Hawkes 1981). In the case of the system described here, this interest is enlarged by the facility of storage and retrieval of…
Abstract The effect of the P‐content in iron (0.002‐0.12% P) and the stirring rate on the corrosion rate of five Fe‐P alloys in H 2 SO 4 and HCl solutions (pH = 0) has been investigated. It was assumed that phosphine generated during corrosion process acts as a stimulator of the cathodic process (at low concentrations…
Relations between the interfacial and the chemical-structural features of oxides are of concern in several fields. Ferrites appear as a particularly suitable system as they allow gradual changes in composition while avoiding complications from structural modifications. A family of iron(II) cobalt ferrites (CoxFe3–xO4,…
Abstract Lattice constants of the monoclinic form of polyethylene under pressures up to 1.8 GPa at 298 K are investigated by x‐ray diffraction. The thermal expansion from 100 K to 300 K at atmospheric pressure is also studied. The equation of state is calculated by Pastine's method, taking into account the zero‐point…
Improving an experimental technique previously used for smectite synthesis, pure Ni or Mg lizardites, and substituted (Mg-Ni) lizardites, have been synthesized between 25 and 200 °C. At low temperature (25 °C), synthetic clays are very hydrated and poorly crystallized. With increasing time and temperature of experimen…
The mechanism of corrosion of stainless steels in highly concentrated sulfuric acid was studied by the electrochemical method and surface analysis as EPMA and Laser-Raman Spectroscopy. Cyclic potential changes occured in this system about between -0.2V (SCE) (active state) and 0.2V (SCE) (passive state). The anodic re…