Materials Literature
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The 15 N hydrogen profiling technique is used to measure hydrogen concentration profiles in a variety of films including amorphous anodic barrier films grown in different electrolytes, pseudoboehmite, and composite oxide films grown by reaction with boiling water followed by anodic oxidation. Hydrogen profiles of the…
Crystal structures of six metamorphic low cordierites with Fel(Fe + Mg) ranging from 0.07 to 0.42 (atomic) were refined from X-ray data. No evidence of a superstructure was found, confirming that, in chemically intermediate cordierites, Fe and Mg are located o1 a single site. Although T-O distances remain nearly const…
Samples prepared to obtain u.v.‐emitting YAlO 3 : Ce (YAP:Ce) by solid‐state reactions up to 1600°C are never free of visible‐emitting Y 3 Al 5 O 12 : Ce (YAG: Ce). Furthermore, YAG cannot easily be removed from the products. By adding Ba compounds, the YAG content of the product can be minimized, and BaAl 2 O 4 and o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Experimental Study of Single-Component and Binary Adsorption Equilibria by a Chromatographic MethodDouglas M. Ruthven and Ravi KumarCite this: Ind. Eng. Chem. Fundamen. 1980, 19, 1, 27–32Publication Date (Print):February 1, 1980Publication History Published online1 May 20…
Abstract The static dielectric constant ϵ s in Pb 1− x Sn x Te ( x = 0 to 0.4) single crystals is determined from a magnetoplasma reflection measurement between 4.2 and 100 K. At high temperatures ϵ s increases with increasing temperature obeying a Curie law. The Curie constant is practically unchanged for different a…
ESR and Mössbauer effect measurements in the crystallization process of 5Na2O⋅Fe2O3⋅8SiO2 glass were made to elucidate the state of Fe3+ ions in glass. The ESR spectra in the crystallization process showed the disappearance of the g=4.3 line and the narrowing of linewidth of the absorption line centered at g=2.0. The…
Abstract The morphology of linear polyethylene of M w / M n 1.19 crystallized isothermally from the melt has been investigated. Electron microscopy (EM) of stained thin sections gave exceptionally well‐defined images. There were no qualitative differences between Regime I and Regime II crystallization, but the lamella…
Abstract 13 C‐NMR gives sequence information in copolyesters synthesized from ethylene glycol (EG), 1,4‐butane diol (BD), and methyl terephthalate (TP). The EG‐TP‐EG and BD‐TP‐BD blocks are distinguishable from the unsymmetrical diester sequence EG‐TP‐BD. The carbonyl and aromatic quaternary carbons of terephthalate h…
The study of the electronic properties of organic solids is a major new frontier in solid state physics. On the practical side, organic solids provide electronic and optical materials whose properties can be tailored to suit specific applications. They also pose continuing challenges to fundamental concepts because th…
Abstract The residual stresses in injection molded bars of polypropylene have been examined using a stress relaxation method and by the layer removal technique. A positive value for the internal stress parameter was obtained with newly molded specimens and was found to be retained by specimens stored at liquid nitroge…
The crystal structure of a metamorphic biotite from Au Sable Forks, New York (northeast Adirondacks) has been refined to an unweighted R value of 4.2Vo. The Au Sable biotite is a 2M, mica with space group symmetry C2/c. Although the biotite equilibrated near and cooled slowly from Z: 7fi)ot5OoC, octahedral and tetrahe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAspects of artificial photosynthesis. Photosensitized electron transfer and charge separation in cationic surfactant vesiclesPierre P. Infelta, Michael Graetzel, and Janos H. FendlerCite this: J. Am. Chem. Soc. 1980, 102, 5, 1479–1483Publication Date (Print):February 1, 1980…
The mechanism of oxidation of a porous silicon layer (PSL) was studied by examining the oxidation progress, the temperature dependence of the oxidation and the infrared absorption spectra. It is found that the oxidation of PSL is controlled by a surface reaction at both the surface of PSL and the wall of pores in PSL.…
New morphologies, especially “core-shell” and multilayered structures (“onion structure”) have been obtained for polymer blends containing block copolymers. For triblock copolymers Cop A-B-C, having three sequences of different types, in this case, poly(styrene-b-isoprene-b-methyl methacrylate), the conditions are giv…
Purely ferroelastic transitions, i.e., transitions associated with a spontaneous deformation but no spontaneous polarization, appear from recent experimental investigations as a very common type of structural phase transitions. A theoretical analysis is presented for this class of transitions on the basis of Landau's…
The equivalent circuit in the mobility analogy of a magnetostrictive transducer in the presence of eddy currents is derived. This equivalent circuit is used to predict the effect of eddy currents on the efficiency, the electrical impedance, the transmitting responses, and the receiving sensitivity of a magnetostrictiv…
A revision and extension of theory is presented on the nozzle extraction process for obtaining “Handle Moduli” as a quantitative measure of fabric hand. The original one dimensional theory is replaced with a two dimensional membrane theory and a different internal pressure hypothesis is proposed which gives better agr…
Abstract The Raman and far‐infrared spectra of a dozen antimony halide complexes of formula SbX 6 −3 , SbX 5 −2 , Sb 2 X 9 −3 and SbX 4 −1 have been recorded and analyzed for X = Br and I. The stretching frequencies for the bromo complexes range from about 135 to 220 cm −1 for external bonds and from about 110 to 130…
We demonstrate that Ti implanted into α-Fe (with ∼60 appm C impurity) getters C (along with a lesser amount of N) upon postimplantation annealing and precipitates as TiC. The microstructure of the TiC precipitates is examined with TEM for annealing temperatures up to 860 °C. The precipitate size evolution is discussed…
A model substrate for studies in the hexahydroporphyrin series, i.e. the title compound (1) having C2v symmetry, has been prepared by a multistep de-novo synthesis from a cyanosubstituted thiolactam. Catalytic hydrogenation of (1) affords the highly O2-sensitive 2,3,7,8,15,24-hexahydro derivative; attempts to incorpor…