Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical reaction coordinates from crystal structure data. I.H. B. BuergiCite this: Inorg. Chem. 1973, 12, 10, 2321–2325Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published inissue 1 October 1973https://pubs.acs.org/doi/10.1021/ic50…
The program presented here performs an automatic indexing of powder patterns by means of a trial-and-error method. It has been optimized and presents a good flexibility. It can account for various additional information, known a priori. In addition, extensive error computations are included in it, leading to a good re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal complexes of 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane, N-tetramethylcyclamE. Kent Barefield and Frank WagnerCite this: Inorg. Chem. 1973, 12, 10, 2435–2439Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published inis…
The in-phase modulus and coefficient of diffusion of nylon 6 fibers are analyzed in terms of wide-and small-angle X-ray diffraction data. Both properties are examined in directions parallel and perpendicular to the fiber axis. The anisotropy in diffusion and mechanical coupling between the crystalline and amorphous ph…
The elastic constants of a hard-rod liquid crystal are calculated using the Onsager theory, with results similar to those given by Priest.Received 30 April 1973DOI:https://doi.org/10.1103/PhysRevA.8.2181©1973 American Physical Society
Abstract Eighteen binary metal oxides consisting of TiO2–MmOn, ZnO–MmOn and Al2O3–MmOn (MmOn: metal oxide) were prepared by the usual co-precipitation method, their acid amounts and strengths being determined by n-butylamine titration using various acid-base indicators. The acid strengths of fourteen of the tested bin…
A physical picture of the smectic $C$ phase is proposed in which the molecules rotate freely about their long axes in the smectic $A$ phase and this rotation is frozen out in the smectic $C$ phase. This picture is in contrast with the accepted view that the long axis of the molecules is normal to the smectic planes in…
A new analysis of polarization curves in the non-Tafel region in the vicinity of the corrosion potential is described which allows calculation of the polarization resistance (Rp) and the Tafel slopes (ba and bc). From these data instantaneous corrosion rates are calculated. Experimental data for the system Fe/1N H2SO4…
The exact renormalization-group approach of Wilson is used to study the critical behavior for $T>{T}_{c}$, $H=0$, and small $\ensuremath{\epsilon}>0$, of an isotropic ferromagnetic system in $d=4\ensuremath{-}\ensuremath{\epsilon}$ dimensions, with exchange and dipolar interactions between $d$-component spins. N…
A method is described for producing thin, hydrophilic support films for electron microscopy. These films have a well defined composition and can be made as thin as 10–15 Å. An application is described in which these hydrophilic films are used as ultrathin ``windows'' for frozen, aqueous specimens.
The emission, excitation and reflection spectra at 300, 80 and 15 K were obtained. The blue emission at 442 mµ was observed for CaS:Sb 3+ as well as the well-known yellow-green emission at 540 mµ. In the excitation or reflection spectra, A , B and C bands were found for all phosphors of Ca(S:Se):Sb 3+ investigated. Th…
By measuring the conductivity of stannic oxide crystals as a function of oxygen partial pressure at elevated temperatures, it is shown that the dominant native defect in SnO2 is a doubly ionizable oxygen vacancy. Both donor levels of this defect, the first 30 meV deep and the second 150 meV deep, are identified and a…
Abstract The reversibility of the reaction CaCO 3 ⇌ CaO+CO 2 has been examined through a large number of cycles (up to 40), mainly at 866 °C. The decomposition to the oxide is always 100% but the reactivity of the oxide so formed to carbon dioxide falls off markedly after a rapid initial reaction. There is a large inc…
The kinetic theory of the rate of growth G and the initial lamellar thickness lg* of chain-folded crystals is extended so that it is applicable at high undercoolings. Attention is centered on the details of how the first step element and the first fold are put down on the substrate. A parameter φ that varies between z…
A theory of yielding of glassy polymers by thermally-activated production of local molecular kinks is described. It is possible to obtain the activation free enthalpy of this process by modeling the intermolecular energy barrier as resulting from the stress fields of two equal and opposite closely spaced wedge disclin…
The short-range stresses of the hexagonal screw dislocation boundary, of the straight tilt boundary, and of a zig-zag tilt boundary are computed. These are found to be quite complicated geometrically. They are of comparable magnitude in all three cases but smaller for the straight tilt boundary than for the zig-zag bo…
Tantalum borate (TaBO4) has the zircon structure with unusual coordination for the cations: Ta5+ in eight- and B3+ in four-coordination. The infrared and Raman spectrum is reported and discussed. The symmetrical and asymmetrical BO5−4 valence stretching lies at much lower energy than usually observed in borates. A com…
High-pressure treated titanium and zirconium have been investigated by means of transmission electron microscopy. The specimens consisted mainly of retained ω-phase, while in some regions α-phase platelets were observed. Two crystallographically nonequivalent sets of matrices of correspondence between the α- and ω-pha…
The second-order Raman-scattering spectra of KCl, KBr, KI, RbCl, RbBr, and RbI have been recorded at 300, 90, and 23 K. A symmetry analysis for reducing phonon pairs into irreducible representations has been employed, in conjuction with a knowledge of the one-phonon densities of states derived from neutron-diffraction…
Current noise measurements at high current densities have been applied to the detection of constrictions in thin-film metallization. Potentially open metal films due to scratches, notching, improper step coverage, etc., are easily detected. The noise level, in the absence of such defects, appears to be an indicator of…