Materials Literature
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Evidence is reported of 1020 cm−3 hydroxyl impurity density affecting crystal fields and color center formations in YAG and Nd:YAG. Also reported is a high-temperature reactive atmosphere process to control H bonding and to bleach coloration. Absorption by O–H⋅⋅⋅O and O–D⋅⋅⋅O transitions in the 3–4 μm spectral region…
The atremate brachiopods are unique in that they possess shells of calcium phosphate. In Lingula adamsi and Gloltidia pyramidata, the shell mineral is (CO3 + F)-containing apatite and is crystallo-chemically similar but not identical to the mineral francolite. The shell of Glottidia consists of a thin periostracum, a…
We have implemented group-theoretical methods on the computer for the description of possible structural phase transitions. All isotropy groups (corresponding to $\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}$ points of symmetry) for each of the 230 three-dimensional space groups as well as the Landau and Lifshitz c…
The fine structure of a surface defect on GaAs grown by molecular beam epitaxy (MBE) is analyzed by transmission electron microscopy (TEM) observing cross-sectional views of the specimen. The defect has a pyramid structure consisting of four {111} stacking fault planes whose Burgers vectors are a 0 /6 <112>, a 0…
Infrared optical fibers composed of Ge-Se based chalcogenide glass have been fabricated by using a specially designed drawing apparatus. Transmission loss of less than 1 dB/m was observed in the IR region of 2–10 μm except at 4.5 μm. The minimum loss is 0.2 dB/m at 5.5-μm wavelength.
Balance laws and constitutive equations are given for elastic continua with memory of past motions and electromagnetic fields. Nonlinear, finite-linear, and linear constitutive equations are obtained and restricted by the second law of thermodynamics. Memory-dependent nonlocal piezoelectricity, piezomagnetism, heat an…
Raman spectra of three readily available C-type stoichiometric rare-earth sesquioxide powders of composition Ln 2 O 3 are presented. Some correlations of spectra with body-cell structure and infrared absorption spectra have been made. Spectra of Eu 2 O 3 , Dy 2 O 3 , and Tm 2 O 3 display several new peaks that have no…
Abstract Combined measurements of shear stress relaxation and differential dynamic storage and loss shear moduli G ′ and G ″ have been made on styrene-butadiene rubber (type 1502) containing 50 phr N299 carbon black and 10 phr Sundex 790 oil, both cured and uncured, and compared with similar measurements on the cured…
Zinc(II) porphyrins bearing unsubstituted β positions can be mercurated at the β position and at an adjacent meso position. Palladium/olefin reactions with the dimercurated porphyrins produce products possessing a five-membered isocyclic ring bridging the β and meso positions and resembling that found in chlorophyll d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-spin five-coordinate ferric porphyrin complex: [5, 10, 15, 20-tetrakis(4-methoxyphenyl)porphyrinato](hydrosulfido)iron(III)Daniel R. English, David N. Hendrickson, Kenneth S. Suslick, Charles W. Eigenbrot Jr., and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1984, 106,…
A combination of techniques has been used to compare the compositional and microstructural characteristics of two commercially hot‐pressed aluminas. Second‐phase material containing Ni was observed in one material, mainly as small intergranular particles. Thermal treatment in air caused Ni to concentrate at the surfac…
Specimens of Zr have been electron-irradiated at temperatures of ∼715 K using a 1 MeV electron microscope. The damage structure has been analysed at room temperature, and the results show that interstitial and vacancy loops with b = ⅓〈1120〉 nucleate and grow. In addition, vacancy loops with b = ½[0001] and interstitia…
Abstract This study was conducted to further characterize aluminum (Al)‐organic matter complexes and their role in soil acidity. The objective was to determine the extractability of Al from organic matter and to relate it to titratable acidity. Two samples of muck were treated with Al 3+ in such a way as to achieve a…
A sensitive gravimetric method is described which is capable of measuring the rate and total amount of uptake of liquid in the direction perpendicular to the plane of a fabric under known negative pressure gradients. This version of the so-called demand wettability experiment is especially useful when spontaneous tran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilithiation of aromatic ethersG. P. Crowther, Richard J. Sundberg, and Ashok M. SarpeshkarCite this: J. Org. Chem. 1984, 49, 24, 4657–4663Publication Date (Print):November 1, 1984Publication History Published online1 May 2002Published inissue 1 November 1984https://pubs.acs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColloidal catalyst-coated semiconductors in surfactant vesicles: in situ generation of rhodium-coated cadmium sulfide particles in dihexadecyl phosphate vesicles and their utilization for photosensitized charge separation and hydrogen generationYves M. Tricot and Janos H. Fe…
We examined a rhyolitic volcanic ash bed deposited 20000 years ago in different leaching environments in New Zealand. When winter leaching was greater than 250 mm a year, the ash contained 10 to 15% allophane; as leaching increased from 250 to 600 mm a year, the A1/Si ratio of the allophane increased from 1.2 to 2.0.…
The etch rate of in solutions of high concentration was shown to be independent of the applied potential in a wide potential range negative with respect to the flatband value. Dissolution of the solid led to the formation of . The etch rate, which was not mass‐transport controlled, was first order in molecular concent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb initio direct calculation of the singlet-triplet splitting in a .mu.-oxalato copper(II) binuclear complexM. F. Charlot, M. Verdaguer, Y. Journaux, P. De Loth, and J. P. DaudeyCite this: Inorg. Chem. 1984, 23, 23, 3802–3808Publication Date (Print):November 1, 1984Publicati…
When plasticized PVC packagings are put into contact with liquids (blood, food), a migration of plasticizer and additives may occur, being responsible for a contamination of the liquid and a decrease in the mechanical properties of polymer. The interest in short tests is especially pointed out. In contrast to classica…