Materials Literature
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The thermodynamic method of calculating calcium sulfate scale has been improved by including the effects of complicated down-hole phase equilibria. Although the modified method has its limitations, it appears to provide more reliable results. Introduction Calcium sulfate (CaSO4) scale, especially gypsum, still causes…
Abstract The reaction of a radiofrequency‐excited oxygen plasma with the surfaces of cured and uncured polymethylsiloxane produces intense hydroxylation of the surface region as followed by FMIR spectroscopy. Characteristic infrared features indicative of intraor intermolecular hydrogen bonding are evident. Plasma oxi…
This paper is a literature survey of quaternary ammonium, sulfonium, and phosphonium polymers.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of sodium hexamolybdochromate(III) octahydrate, Na3(CrMo6O24H6).8H2OAlvin PerloffCite this: Inorg. Chem. 1970, 9, 10, 2228–2239Publication Date (Print):October 1, 1970Publication History Published online1 May 2002Published inissue 1 October 1970https://pubs…
The authors previously (1968) presented vibrational spectra for vitreous silica, germania and beryllium fluoride, calculated from atomic arrangements in physical models based on the random network theory. The present work describes the localization properties of the normal modes of vibration. It is shown that the vibr…
The unit cell dimensions have been measured at temperatures between 93 and 333 K for linear polyethylene samples with long periods of 385, 220, and 99 Å. The angular positions of 6 x-ray diffraction lines were obtained at 5–10 K intervals with a powder diffractometer and the positions corrected for beam penetration so…
X-ray photoelectron spectroscopy (XPS) is used to measure splittings of metal-atom electron binding energies in both inorganic solids and gases. These splittings are due to the various possible multiplet states formed by coupling a hole in a metal-atom subshell to an unfilled valence subshell. Splittings are observed…
A Thomas-Fermi (TF) calculation of the energy of partially ionized matter involves an evaluation of the energy of the electron-nuclear interaction by means of the TF electron density. The TF electron density is particularly unrealistic in the region near the nucleus where the potential is large. The result is that TF…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism, Kinetics, and Equilibrium of Thermal Decomposition of Ammonium SulfateRaisaku Kiyoura and Kohei UranoCite this: Ind. Eng. Chem. Process Des. Dev. 1970, 9, 4, 489–494Publication Date (Print):October 1, 1970Publication History Published online1 May 2002Published ini…
A model for grain boundary sliding is developed in which sliding occurs by the movement of dislocations along, or adjacent to, the boundary by a combination of climb and glide. Under these conditions the strain rate due to sliding is proportional to [sgrave]2/d, where [sgrave] is the applied stress and d is the averag…
Mathematical analyses previously made for diffusion-limited growth and dissolution of spherical and planar precipitates have been reviewed. The analyses include the invariant-field (Laplace), the invariantsize (stationary interface) and the linear-gradient approximations, and where possible, exact solutions of the dif…
Results of optical absorption and electroabsorption (EA) measurements in the vicinity of the interband absorption edge are reported for top-seeded solution-grown crystals of BaTi${\mathrm{O}}_{3}$. In common with other perovskite oxides, the absorption edge in BaTi${\mathrm{O}}_{3}$ is found to display Urbach-rule beh…
Abstract Heiße Phosphorsäure eliminiert Carboxyl, Äthoxycarbonyl‐ und Acyl‐Gruppen aus Pyrrol· Derivaten.
Recent trends in the preparation of synthetic diamonds, relying on the influence of surface forces exerted by the diamond seed crystal on the carbon deposition processes, are discussed. Epitaxial synthesis can occur from carbon-containing gases or from molten metals. Foreign publications and patents are discussed as w…
Cadmium single crystals of high purity have been deformed at room temperature, by basal slip in uniaxial tension, at a strain rate of 8 × 10−6 s−1. The density and distribution of edge dislocations have been examined by an etch pit technique and it is found, in contradiction to the results of a similar study by Kratoc…
A single-domain SrTiO3 crystal is obtained by stressing along the [110] direction at 2°K and is observed optically for the first time. Domain structure under [001] stress is also examined. The importance of understanding the domain structure is discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCollagen structure in solution. IV. Conformational properties of refolded cross-linked chainsPeter V. Hauschka and William F. HarringtonCite this: Biochemistry 1970, 9, 19, 3745–3754Publication Date (Print):September 15, 1970Publication History Published online1 May 2002Publ…
The 93Nb nuclear magnetic resonance has been studied in sintered powders of the solid-solution system LiNbO3–LiTaO3. The Nb nuclear quadrupole coupling constant decreases linearly with an increase in LiTaO3 concentration and this behavior agrees with the calculated electric field gradient. A variation of the 93Nb NMR…
The self-diffusion coefficients of copper in copper-zinc alloys containing 0-4-at.% zinc have been measured at 894.4 and 946.7\ifmmode^\circ\else\textdegree\fi{}C. These results, together with the correlation factor for the diffusion of zinc in copper as determined from measurements of the isotope effect, are used to…
The absorption coefficients of Al, Si, and SiO were determined in the extreme uv with high spectral resolution, using synchrotron radiation. A detailed comparison of the ${L}_{\mathrm{I}\mathrm{I},\mathrm{I}\mathrm{I}\mathrm{I}}$ edge in the metal and in the semiconductor shows important differences. The spikes observ…