Materials Literature
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Abstract Angle‐dependent x‐ray photoelectron spectroscopy (AD‐XPS) measurements have been carried out on thin aluminium oxide layers formed on pure aluminium by oxidation in oxygen at 25°C and at 250°C. The amounts of oxygen of the oxide overlayers were measured by nuclear reaction analysis (NRA). The equipment thickn…
A simple phenomenological model with two coupled structural and ferroelectric order parameters is under consideration. The small-signal dielectric response, dielectric response to a strong electric field (hysteresis phenomena included), and the phase diagram in the presence of the bias field are analyzed in the framew…
ABSTRACT Irreversible intermolecular reaction rates k in dilute polymer solutions and unentangled melts are studied as a function of time, molecular weight, and location of reactive groups along the polymer backbones. As for intramolecular reactions, the kinetics are determined by the reaction exponent 0 (3 + g) / z,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic properties of a nitronyl nitroxide and of its imino analog. Crystal packing and spin distribution dependence of ferromagnetic intermolecular interactionsFabrice Lanfranc de Panthou, Dominique Luneau, Jean Laugier, and Paul ReyCite this: J. Am.…
Angle calculations are presented for a new type of diffractometer suitable for surface X-ray diffraction. The new geometry results from combining the four-circle and the z-axis geometries and involves six circles. Instruments based on this concept can be operated in different diffraction geometries. Compared to the fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and nonlinear optical properties of donor-acceptor substituted triaryl azole derivativesChristopher R. Moylan, Robert D. Miller, Robert J. Twieg, Kathleen M. Betterton, Victor Y. Lee, Tracy J. Matray, and Cattien NguyenCite this: Chem. Mater. 1993, 5, 10, 1499–1508…
Active oxidation behavior of CVD‐SiC in CO─CO 2 atmospheres was investigated using a thermogravimetric technique in the temperature range between 1823 and 1923 K. The gas pressure ratio, P CO2 / P CO , was controlled between 10 −4 and 10 −1 at 0.1 MPa. Active oxidation rates (mass loss rates) showed maxima at a certai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContact faces of epitaxially crystallized .alpha.- and .gamma.-phase isotactic polypropylene observed by atomic force microscopyW. Stocker, S. N. Magonov, H. J. Cantow, J. C. Wittmann, and B. LotzCite this: Macromolecules 1993, 26, 22, 5915–5923Publication Date (Print):Octob…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of triethoxysilyl-terminated polyoxazolines and their cohydrolysis polymerization with tetraethoxysilaneYoshiki Chujo, Eiji Ihara, Shigeo Kure, and Takeo SaegusaCite this: Macromolecules 1993, 26, 21, 5681–5686Publication Date (Print):October 1, 1993Publication His…
Microspheres made from Y2O3-Al2O3-SiO2 (YAS) glasses, which contain radioactive Y-90, are currently being used to treat liver cancer in humans, where their chemical durability is of prime importance. In deionized water or saline at 37 degrees C, the weight percent Yttrium (Y) dissolved from eight different YAS glasses…
We present evidence for a finite-temperature phase transition in the phason elasticity of quasicrystals. A tiling model for energetically stabilized decagonal quasicrystals has been studied in an extensive series of Monte Carlo simulations. The Hamiltonian (energetics) of the model is given by nearest-neighbor Penrose…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase structure of random ethylene copolymers: a study of counit content and molecular weight as independent variablesRufina G. Alamo, Brent D. Viers, and Leo MandelkernCite this: Macromolecules 1993, 26, 21, 5740–5747Publication Date (Print):October 1, 1993Publication Histo…
The electron diffusion coefficient (De) for the redox polymer POs-EA, an ethylamine quaternized poly(vinylpyridine) complex of Os(bipyridine)2Cl2, has been directly measured by steady-state voltammetry at interdigitated array (IDA) electrodes. In cross-linked POs-EA De decreased upon increasing the ionic strength and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBeyond metallo-carbohedrenes: growth and decomposition of metal-carbon nanocrystalsJ. S. Pilgrim and M. A. DuncanCite this: J. Am. Chem. Soc. 1993, 115, 21, 9724–9727Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 Oct…
The full three-dimensional single-crystal crystal structure of the perovskite material PbZrO 3 (M r =346.42) has been refined. It is found that the structure is disordered with two substructure components related by a shear of c/2. Each individual substructure corresponds closely to the tilt system a - a - c 0 of Glaz…
$^{151}\mathrm{Eu}$ M\"ossbauer effect measurements were carried out for various silicate and phosphate laser glasses doped with ${\mathrm{Eu}}^{3+}$ ions instead of ${\mathrm{Nd}}^{3+}$, for which Judd-Ofelt ${\mathrm{\ensuremath{\Omega}}}_{\mathit{t}}$ parameters are known. The isomer shift (IS) for the silicate gla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuaternary rubidium copper tin sulfides (Rb2Cu2SnS4, A2Cu2Sn2S6 (A = Na, K, Rb, Cs), A2Cu2Sn2Se6 (A = K, Rb), potassium gold tin sulfides, K2Au2SnS4, and K2Au2Sn2S6. Syntheses, structures, and properties of new solid-state chalcogenides based on tetrahedral [SnS4]4- unitsJu…
Various metals were deposited on luminescent porous silicon (PS) by immersion in metal ion solutions and by evaporation. The photoluminescence (PL) was quenched upon immersion in ionic solutions of Cu, Ag, and Au but not noticeably quenched in other ionic solutions. Evaporation of 100 Å of Cu or 110 Å of Au was not ob…
Abstract The destruction of the crystal structure of kaolinite caused by mechanical forces was investigated by X-ray diffraction, thermal analysis, infrared spectroscopy, and specific surface area determination. Attention was also directed to the change of thermal reactions of milled kaolinite. Grinding experiments fo…
A synergistic effect exists when BTAH and iodide ions are used together to prevent the corrosion of copper in sulfuric acid. The nature of this effect has been studied systematically by using electrochemical techniques and x‐ray photoelectron spectroscopy. The synergistic effect is due largely to the formation of a fi…