Materials Literature
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It is proposed that a weighted coordination number, Z*, be used as a measure of the number of neighbours of an atom in a crystal. Coordinating atoms contribute faces to the Voronoi polyhedron around a central atom and their contributions are weighted in proportion to the solid angle subtended by that face at the centr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and stereochemical implication of the [Pt19(CO)12(.mu.2-CO)10]4- tetraanion: a bicapped triple-decker all-metal sandwich of idealized fivefold (D5h) geometryDon M. Washecheck, Edward J. Wucherer, Lawrence F. Dahl, Alessandro Ceriotti, Giuliano Longoni,…
Polarization measurement and an accelerated life test of the oxide‐coated titanium anodes in relatively dilute solutions of and in solution were conducted. The OCTA failed at potentials higher than 1.3V vs. SCE, probably due to anodic oxidation of and passivation of Ti substrate. An accelerated life test based on thos…
Raman spectra were measured at room temperature and at liquid nitrogen temperature on six rare‐earth zirconates, RE 2 Zr 2 O 7 (RE=Nd, Sm, Gd, Dy, Er, and Yb). The spectra of the three compounds with large rare‐earth ions exhibited most of the expected Raman bands of the pyrochlore structure but with large, temperatur…
The trapping of ion-implanted deuterium (D) by lattice damage in Fe was investigated in the temperature range 90–500 K. The D depth profile was determined by measuring the proton yield from the 3He-excited nuclear reaction D(3He,p)4He, and the D lattice location was obtained by ion channeling. Linear ramping of the te…
An extensive vibrational assignment of TTF and TTF-d4 is achieved, improving the previously reported one through the use of polarized infrared spectra of single crystals of the monoclinic form. Infrared spectra of the monoclinic and triclinic forms are compared and the different crystal field effects discussed. Powder…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Transition Behavior of the Isolated Polymer ChainIsaac C. SanchezCite this: Macromolecules 1979, 12, 5, 980–988Publication Date (Print):September 1, 1979Publication History Published online1 May 2002Published inissue 1 September 1979https://doi.org/10.1021/ma60071a040R…
A model system consisting of highly purified lysyl oxidase and reconstituted lathyritic chick bone collagen fibrils was used to study the effect of collagen cross-linking on collagen degradation by mammalian collagenase. The results indicate that synthesis of approx. 0.1 Schiff-base cross-link per collagen molecule re…
Electron-spin-resonance studies of a series of air-annealed samples of glassy Si${\mathrm{O}}_{2}$ having various degrees of enrichment (or depletion) in the $^{29}\mathrm{Si}$ isotope have confirmed that a $\ensuremath{\gamma}$-ray-induced doublet of 420-G splitting is the $^{29}\mathrm{Si}$ hyperfine structure of th…
Glasses containing up to 7 at.% nitrogen were prepared in the system Y‐Si‐Al‐O‐N. The glass transition temperature, hardness, and relative fracture toughness increase and the thermal expansion coefficient decreases with increasing nitrogen content. Weight losses after 350 h in 95°C distilled water are not simply relat…
The intensities of X-ray scattering from three compounds has been measured photographically at a number of temperatures. The substances studied were 4,4′di-n-octyloxyazoxybenzene (OOAB) and its di-n-heptyl homologue (HOAB) in their nematic and smectic C phases and ethyl-4-(4′acetoxybenzylidene)aminocinnamate (EABAC) i…
The chemical structures of thin SiO2 films, thin native oxides of GaAs (20–30 Å), and the respective oxide–semiconductor interfaces, have been investigated using high-resolution x-ray photoelectron spectroscopy. Depth profiles of these structures have been obtained using both argon ion bombardment and wet chemical etc…
An all-valence-electron self-consistent-field linear-combination-of-atomic-orbitals molecular-orbital procedure including configuration interactions for calculating the magnitude and sign of the nonlinear second-order molecular susceptibility components (hyperpolarizability) for substituted dipolar aromatic molecular…
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