Materials Literature
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The technique of liquid phase epitaxy has been used to produce single-crystal garnet phosphor screens for cathode ray tubes. The films were rare-earth-doped yttrium aluminum garnets (YAG’s) grown onto YAG substrates using a PbO:B2O3 flux. We have studied the light output of these layers as a function of film growth te…
We have measured the effects of pressure, temperature, and some variations in impurity content on the growth rate u of quartz into fused silica. Under all conditions the growth rate was interface controlled and increased exponentially with pressure with an activation volume averaging −21.2 cm3/mole. The activation ent…
Abstract A lithologically continuous vertical rock‐saprolite‐soil sequence was studied in order to determine its mineralogical characteristics and transformations. The soil was a Typic Hapludult from the North Carolina Piedmont formed on granitic gneiss. The profile was sampled in 19 horizons, from the surface to slig…
The effect of variations in the Ge, B, P, and OH content on the radiation response of Ge-doped silica-core optical fiber waveguides has been measured at 0.82 and 1.3 microm. It has been established that variations in neither OH content nor Ge concentration affect the response of these fibers. B doping increases the lo…
Above and below the Verwey transition in Fe3O4 the influence of the short-and long-range order of the extra B-site electrons on the density of states, the d.c conductivity and the optical absorption for infra-red frequencies is investigated. Our theory takes into account the Coulomb interaction between nearest (U1) an…
We report the observation of highly polarized, angle-tunable visible light emission from Al-AlOx-Ag tunnel junctions fabricated on holographic gratings. From the angular dependence of the emission frequency we identify the electromagnetic mode responsible for the emission. The mode is surface plasmonlike with a disper…
The effects of eleven heavy metals on the morphology of several marine diatoms and a silicoflagellate were compared. With Thalassiosira aestivalis the main effects of metals that were toxic were granular, yellowed cytoplasm; a disruption of chloroplast integrity and dispersion; and more delicate spines extruded from t…
Abstract The vertical clay mineral distribution pattern in two sediment cores taken from two East African lakes has been studied in detail. In the core from Lake Albert (Mobutu Sese Seko) a clay assemblage consisting principally of smectite with some illite and kaolinite in the uppermost segment of the core changed wi…
The setting reactions and thermal degradation of the phosphate binders are interpreted from the DTA and X-ray diffraction data. Setting takes place through complex formation of (NH4Mg PO4.6H2O)n, excess reactants, and water. Dehydration and thermal reactions lead to a sequence of reactions forming (NH4MgPO4.H2O)n, (Mg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyarsenide anions. Synthesis and structure of a salt containing the undecaarsenide(3-) ionClaude H. E. BelinCite this: J. Am. Chem. Soc. 1980, 102, 19, 6036–6040Publication Date (Print):September 1, 1980Publication History Published online1 May 2002Published inissue 1 Sept…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal EPR studies on nickel(III), palladium(III), and platinum(III) dithiolene chelates containing the ligands isotrithionedithiolate, o-xylenedithiolate, and maleonitriledithiolateReinhard Kirmse, Joachim Stach, Wolfgang Dietzsch, Guenter Steimecke, and Eberhard Ho…
The theory described in the previous paper [Kato (1980). Acta Cryst. A36, 763-769] has been applied to calculating the intensity distribution in the topography of statistically homogeneous crystalline media. The integrated intensity for parallel-sided crystals is also presented. The formulae cover the whole range of c…
The formation of protective layers on Cu‐9.4Ni‐1.7Fe alloy in air‐saturated, aqueous 3.4 weight percent solution, both under natural corrosion and under potentiostatic conditions, has been studied by ESCA (XPS), SEM, and x‐ray diffraction. It was concluded that the protective film formed under open‐circuit corrosion c…
Abstract Thermal denaturation of lysozyme (hen egg-white) in aqueous sugar solution was studied by DSC measurements at pH 5 and by CD measurements at pH 2.12. All of the sugars investigated show a stabilizing influence on the native conformation. The effect of sugars on the transition temperature of lysozyme almost li…
Pig heart DPN-dependent isocitrate dehydrogenase is heterogeneous on isoelectric focusing in 6 M urea. Under these conditions, three types of subunits (termed alpha, beta, and gamma), which have isoelectric points of about 5.7, 6.6, and 7.2, respectively, can be separated. On the basis of densitometric scans of analyt…
Extended X-ray absorption fine structure (EXAFS) results are presented for solid and liquid Zn for the temperature range 273 to 782 K. At the higher temperatures the distribution of nearest neighbour atoms is asymmetric. Neglect of the asymmetry and use of EXAFS analysis methods developed for symmetric distribution fu…
Differential cross sections of electrons elastically (vibrationally) scattered from ${\mathrm{N}}_{2}$ have been measured by a crossed-beam method. Energy and angular range of the measurements are 1.5 to 400 eV and -96\ifmmode^\circ\else\textdegree\fi{} to + 156\ifmmode^\circ\else\textdegree\fi{}, respectively, with a…
The self‐diffusion coefficients of 14 C in high‐purity, essentially intrinsic and N‐doped, n ‐type α‐SiC single crystals were measured at 2123 to 2453 K. The Si 14 C tracer was chemically bonded by a traveling solvent technique. The D c * in the doped crystals is smaller than that of the pure materials because of the…
In this paper a theory is presented of antiferromagnetic superconductors in which a spin-density wave (SDW) ordering with a wave vector $\stackrel{\ensuremath{\rightarrow}}{\mathrm{Q}}$ may coexist with superconductivity. The effect of the antiferromagnetic molecular field ${h}_{Q}(T)$ on the Cooper pairing is studied…
Abstract Fourier‐transform (FT) infrared spectroscopy has been applied to the study the hydrothermal degradation of various coupling agents on E‐glass fibers. The coupling agents studied include γ‐methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, and cyclohexyltrimethoxysilane. The amount of coupling agents o…