Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of the defect ("lacunary") complex polymolybdophosphate, PMo11O397-. Isolation, purification, stability characteristics, and metalation chemistryLucille A. Combs-Walker and Craig L. HillCite this: Inorg. Chem. 1991, 30, 21, 4016–4026Publication Date (Print):Oct…
The energy-absorption capability as a function of crushing speed was determined for Thornel 300-Fiberite 934 (Gr-E) and Kevlar-49-Fiberite 934 (K-E) composite material. Circular cross section tube specimens were crushed at speeds ranging from 0.01 m/sec to 12 m/sec. Ply orientations of the tube specimens were [0/± θ]…
Cr spectra obtained by x‐ray photoelectron spectroscopy (XPS) of corrosion product layers is critically examined for evidence of photoreduction of hexavalent species. Tetravalent and trivalent decomposition products are identified, and methods of curve fitting and analysis are discussed. Disagreement between x‐ray abs…
A chain compound of formula Mn(hfac)2NITPhOMe, where hfac = hexafluoroacetylacetonato and NITPhOMe = 2-(4-methoxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide, was synthesized, and the X-ray analysis showed that it crystallizes in the trigonal acentric P3(1) space group with a = 11.131 (3) angstrom, c = 20.846…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution structure elucidation of early transition metal polyoxoalkoxides using oxygen-17 NMR spectroscopyV. W. Day, T. A. Eberspacher, W. G. Klemperer, C. W. Park, and F. S. RosenbergCite this: J. Am. Chem. Soc. 1991, 113, 21, 8190–8192Publication Date (Print):October 1, 19…
We have measured the off-center displacements of the Nb ions in ${\mathrm{KTa}}_{0.91}$${\mathrm{Nb}}_{0.09}$${\mathrm{O}}_{3}$ as a function of temperature both below and above the ferroelectric transition temperature ${\mathit{T}}_{\mathit{c}}$=85.6 K. The purpose of these measurements was to elucidate the basic nat…
Critical analyses of published reaction studies on kaolinite, and sol‐gel and powder mixtures equivalent to 3Al 2 O 3 ·2SiO 2 mullite, were made. Supplementary experiments on reactions of kaolinite at different rates of heating were analyzed. Complete atomic homogeneity of precursors results in formation of tetragonal…
R ‐curves for a sinter/HIPed SiC(whisker)‐reinforced alumina and a sintered silicon nitride were assessed by direct measurements of lengths of cracks associated with Vickers indentation flaws. The fracture toughness measurements based on (a) initial (as‐indented) crack lengths, (b) equilibrium growth of cracks during…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic behavior of noble metal/reducible oxide materials for low-temperature carbon monoxide oxidation. 1. Comparison of catalyst performanceSteven D. Gardner, Gar B. Hoflund, David R. Schryer, Jacqueline Schryer, Billy T. Upchurch, and Erik J. KielinCite this: Langmuir 1…
Transparent conductive indium-tin oxide thin films were prepared by an atmospheric-pressure chemical vapor deposition method. The source materials were indium acetylacetonate and tin (II) acetylacetonate which are nontoxic and easy to handle. The polycrystalline films were obtained at a reaction temperature in the ran…
We report measurements of lattice constants of single-crystal synthetic diamonds that cover the range of isotopic compositions from almost-pure $^{12}\mathrm{C}$ to almost-pure $^{13}\mathrm{C}$. These provide a demonstration of an effect of isotopic composition on the lattice constant of this material. The results ar…
The field and temperature dependencies of the hole mobility of 1,1-bis(di-4-tolylaminophenyl)cyclohexane (TAPC) doped polystyrene have been measured and compared to results obtained for the TAPC doped polycarbonate and pure TAPC. The results are described by the disorder formalism, due to Bässler and co-workers. The m…
Implantation of MeV erbium ions into micron-thick silica and phosphosilicate glass films and 1200-Å-thick Si3N4 films is studied with the aim of incorporating the rare-earth dopant on an optically active site in the network. Implantation energies and fluences range from 500 keV to 3.5 MeV and 3.8×1015 to 9.0×1016 ions…
Aluminum doped zinc oxide (ZnO:Al) films were deposited on (112̄0) oriented sapphire substrates heated to 200 °C with a radio-frequency (rf) power ranging from 25 to 170 W for a deposition rate in the range 0.7–27.4 nm min−1 by rf-magnetron sputtering from a ZnO target mixed with Al2O3 of 2 wt. %. All of the films dep…
An experimental technique has been developed to study the electrokinetic behavior of gas bubbles in aqueous electrolyte solutions. It was found that bubbles are negatively charged in NaCl solutions whereas, under certain conditions, they become positively charged in MgCl2 solutions. The observed charge reversal in the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Raman and ultraviolet diffuse reflectance spectroscopic investigation of silica-supported molybdenum oxideClark C. Williams, John G. Ekerdt, Jih Mirn Jehng, Franklin D. Hardcastle, Andrzej M. Turek, and Israel E. WachsCite this: J. Phys. Chem. 1991, 95, 22, 8781–8791Public…
A BN interphase has been deposited, by isothermal/isobaric chemical vapor infiltration (ICVI) from BF 3 ─NH 3 , within a preform made from ex‐polycarbosilane (ex‐PCS) fibers, at about 1000°C. In a second step, the BN‐treated preform was densified with SiC deposited from CH 3 SiCl 3 ─H 2 at about the same temperature.…
Using a larger data set and more detailed analysis, we continue our examination of the zero-temperature vibrational spectrum of a glass of soft spheres by computer simulation. As in our previous study [Phys. Rev. Lett. 66, 636 (1991)], a normal-mode analysis shows clearly the existence of (quasi-)localized modes at th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel aspects in the structure of poly(ethylene terephthalate) as revealed by means of small angle x-ray scatteringC. Santa Cruz, N. Stribeck, H. G. Zachmann, and F. J. Balta CallejaCite this: Macromolecules 1991, 24, 22, 5980–5990Publication Date (Print):October 1, 1991Publ…
Abstract Polymers were synthesized from substituted phenolic and aromatic amine compounds with hydrogen peroxide as the source of an oxidizing agent and horseradish peroxidase enzyme as the catalyst. The polymerization reaction was carried out in a monophasic organic solvent with small amounts of water at room tempera…