Materials Literature
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The influence of temperature and associated dislocation microstructure on the energetics of basal plane cleavage in zinc crystals has been investigated using the method of Hull, Beardmore, and Valentine (HBV). A marked temperature dependence was observed in the zinc surface energy, over the range 77–298 °K, contrary t…
The electrical conductivity of single crystalline SrTi 1- x V x O 3 (0.1≦ x ≦1) was measured down to 4.2 K. The depth of the donor level of V 4+ in SrTiO 3 was about 0.6 eV. The metal-nonmetal transition occurred at x ≃0.6 with σ≃280 Ω -1 cm -1 and the conductivity increased with x up to about 2×10 4 Ω -1 cm -1 at x =…
The reactions of 1-lithioalkoxyethylenes with hexafluorocyclotriphosphazene (N3P3F6) have been examined. In contrast to similar reactions of propenyl lithium with N3P3F6, no evidence for degradation reactions via anionic attack on the olefinic center was observed and the reaction proceeds smoothly to yield N3P3F6-N (C…
The extent of oxygen diffusion in oxide scales formed on metals during high-temperature oxidation can be studied by sequential oxidation in 16O2 and 18O2 followed by SIMS profiling. Previously, 16O− and 18O− profiles have been used to examine oxygen penetration, but the analysis is limited in its ability to quantify d…
Abstract Measurements of the differential heats of K-Ca exchange are used to show that 6 groups of sites (ranging from −13.8 to −5.1 kJ/eq and with as many as 4 in any one sample) exist in kaolins that range from 0 to 15% in their 2:1 phyllosillicate content. These heat values, coupled with entropies of exchange, sugg…
A simple model is proposed to account for the influence of the β-phase atomic order on the martensitic transformation undergone by shape-memory alloys. The dependence of the elastic constants of the high-temperature phase on atomic order is calculated within the harmonic approximation, giving rise to a coupling betwee…
As the noble gases play a major role in establishing the interconnection of escape routes from the interior to the exterior of nuclear reactor fuel, a realistic description of the release of volatile fission products (VFPs) must a priori include a realistic description of fission gas release and swelling. In addition,…
An interactive Fortran IV program is described which allows the orientation matrix of a crystal to be determined and refined without ambiguity, from a transmission or reflection Laue photograph. The indexing method is that of Riquet & Bonnet [ J. Appl. Cryst. (1979), 12 , 39–41] applied to a small number of data (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of organomolybdenum compounds. 2. Synthesis, structure and properties of dioxodineopentyl(2,2'-bipyridyl)molybdenum(VI) and of related compoundsFred Ross, Dawn Ross, Elmer O. Schlemper, Gerard Schrauzer, Laura Hughes, and Norman StrampachCite this: Organometallics 19…
Power transformer availability and utilization are key factors in overall transmission system availability and utilization. A Microprocessor based Transformer Analysis System (MTAS) has been conceptually configured to provide improved power transformer availability and utilization through the continuous monitoring and…
A tunable dye laser was used to selectively excite Eu3+ ions in nonequivalent types of crystal field sites in a germinate glass host. The results demonstrate the existence of three major types of sites in this host. In addition, time-resolved spectroscopy results show the presence of energy transfer between ions in th…
Abstract Poly(methyl methacrylate) (PMMA) has been studied by photon correlation spectroscopy in the temperature range 120–150°C. The relaxation functions for longitudinal density fluctuations were determined and analyzed using the empirical function ϕ( t ) = exp[−( t /τ) β ]. The average relaxation times were calcula…
Abstract Ortho‐nitrobenzyl cholate esters have been successfully used as photosensitive components in solution inhibition deep UV photoresists. The photochemical behavior of a variety of substituted o‐nitrobenzyl cholate derivaties has been examined and resist sensitivity is related to the quantum yield of the reactio…
Abstract The crystal structure of a magnesian cronstedtite-2 H 2 from Pribram, Czechoslovakia, was refined in space group C 1 to a residual of 5.4% with 1832 independent reflections. Tetrahedral ordering between Fe 3+ and Si is judged to be complete on the basis of electron density maps, the first confirmation of such…
Abstract Die Schwingungsspektren von festem α‐ und β‐As 4 S 4 und das Ramanspektrum von geschmolzenem As 4 S 4 wurden aufgenommen. Die Zuordnung der Schwingungsfrequenzen wird, vor allem basierend auf Polarisationsdaten, vorgeschlagen. Die Raman‐Schmelzspektren zeigen, daß As 4 S 4 ‐Moleküle (Symmetrie D 2d ) auch im…
The potential emission from aluminum under argon ion bombardment and an enhanced emission under oxygen ion bombardment have been investigated for an aluminum sample. For this a compact energy analyzer was made to measure energy distribution of secondary electrons at certain detection angle as well as total yield for t…
The nature of the blue-emission bands appearing in highly conductive n-type and Ag-ion-implanted cubic ZnS with iodine (ZnS:1) has been investigated by means of time-resolved photoluminescence and electroluminescence measurements. It is found that the n-type crystal exhibits extremely efficient blue luminescence aroun…
The effect of isothermal annealing on residual strain in the lattice of as-deposited basal crystallographic orientation zinc oxide was studied. Films were prepared by rf diode sputter deposition from a zinc oxide target and annealed in air for 5 to 1995 min at 300 or 500 °C. The change in crystallography as a result o…
Poly-para-xylylene family thin films deposited by vapor phase polymerization are pin hole free and are chemically inert to most acids, alkalies, and organic solvents. These properties make this material very attractive as a passivation agent on top of devices. This paper discusses the patterning of such films on plana…
The phase relations in the systems MgO‐Y 2 O 3 ‐ZrO 2 and CaO‐MgO‐ZrO 2 were established at 1220° and 1420°C. The system MgO‐Y 2 O 3 ‐ZrO 2 possesses a much‐larger cubic ZrO 2 solid solution phase field than the system CaO‐MgO‐ZrO 2 at both temperatures. The ordered δ phase (Zr 3 Y 4 O 12 ) was found to be stable in t…