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β eucryptite, Li 2 O · Al 2 O 3 · 2SiO 2 , has a high-quartz-like structure. It crystallizes in the space group P 6 2 22. X-ray diffraction photographs of single crystals show, besides the main reflections of a high-quartz-like subcell, superstructure reflections which lead to doubling of the lattice constants of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOut-of-plane interactions in parallel-planar copper(II) dimers. Structure and magnetic properties of dibromobis(2-methylpyridine)copper(II)Phirtu Singh, David Y. Jeter, William E. Hatfield, and Derek J. HodgsonCite this: Inorg. Chem. 1972, 11, 7, 1657–1661Publication Date (P…
One unsymmetricly p,p′-disubstituted trans-stilben and more than 60 new phenylbenzoates are described (Tab. 1). These compounds show partly enantiotropic, partly monotropic nematic behaviour. Some low melting substances and especially eutectic mixtures of this class of compounds are useful as room-temperature nematic,…
The continuum approximation replaces a group of discrete dislocations by a continuous dislocation density. It is shown that this formalism possesses similarity solutions of the equations of motion with an arbitrary power law stress-velocity relationship in parallel with the similarity motions of the discrete group. Th…
The superstructure of β eucryptite shows an alternating sequence of Si and Al layers. For a Si-Al ratio of 1:1 only in this arrangement each AlO 4 or SiO 4 tetrahedron can be surrounded by four SiO 4 or AlO 4 tetrahedra, respectively. The Li atoms also have an ordered distribution. The following mean values of bond di…
The pair-production energy Ep for free carriers in silicon and germanium is measured using low-energy electrons (10–24 keV) as ionizing sources. The number of carriers generated is measured via a modified Haynes-Shockley technique with a pn junction collector and a super-posed drift field. Experimental values for Ep o…
The pitting of pure iron, and its alloys with chromium and copper, in neutral chloride solutions, has been studied using microscopy and time-lapse photography, and measurements have been made of local variations of pH value and electrode potential using micro-electrodes. Primary pitting at a few discrete points is fol…
Abstract Secondary nucleation in the potassium sulfate‐water system occurs by micro‐attrition processes over the entire 1.3‐26 μ size range of this study. Experimental nucleation rates were correlated with power‐law kinetics expressions in terms of supersaturation, the fourth moment of the parent seed‐crystal distribu…
Abstract Two types of emulsion‐grade polytetrafluoroethylene particles have been studied. We refer to these as ribbons and rods. The ribbons consist of very thin ribbons or lamellae folded upon themselves a number of times. In typical emulsion‐grade material prepared at Allied Chemical, the unraveled ribbon measures a…
A technique is described for measuring the rate of photobleaching of anisotropic dye molecules in solid polymer matrices. Three dyes of different classes in two matrices (PMMA and epoxy resin) show bleaching rates that differ by a factor of 20. The bleaching rate is linearly proportional to the intensity of incident r…
The crystal structure of the mineral analcime, NaAlSi 2 O 6 · H 2 O, known from x-ray analysis to approximate closely to the cubic space-group symmetry Ia 3 d , has been examined by neutron diffraction. Intensity data from a single crystal were collected for one octant so as to be representative of cubic and some lowe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhthalocyanine derivatives from 1,2,4,5-tetracyanobenzene or pyromellitic dianhydride and metal saltsDavid R. Boston and John C. Bailar Jr.Cite this: Inorg. Chem. 1972, 11, 7, 1578–1583Publication Date (Print):July 1, 1972Publication History Published online1 May 2002Publish…
Any type of irradiation that displaces atoms can produce voids in non-fissile metals and alloys, consequent swelling and mechanical property effects becoming important in fast reactor design and operation. The basic reason for void formation is preferential absorption of interstitials at dislocations. Void growth depe…
Reaction of molecular oxygen as a modulated molecular beam with the basal plane of pyrolytic graphite is investigated. The graphite surface participates in the reaction in an unusual fashion. Oxidation tends to create a highly reactive surface while thermal annealing tends to deactivate the surface. The imbalance of t…
Abstract The two endotherms found during DSC analysis of annealed or drawn poly(ethylene terephthalate), PET, are discussed in greater. detail. Earlier workers proposed that the endotherms were the result of separate morphologies, i.e., extended‐chain and folded‐chain crystals, but more recently Roberts and others hav…
Other| July 01, 1972 The genus Globigerinatheka Broennimann H. M. Bolli H. M. Bolli Search for other works by this author on: GSW Google Scholar Author and Article Information H. M. Bolli Publisher: Cushman Foundation for Foraminiferal Research First Online: 03 Mar 2017 Online ISSN: 1943-264X Print ISSN: 0096-1191 Geo…
Abstract A great number of bands have been observed by light scattering and infrared absorption in Cu 2 O crystals corresponding to transitions most of which are normally forbidden in the perfect crystal. An analysis of the symmetry properties of the lattice modes in the presence of defects is given. In particular the…
Abstract The silver complexes of various thiols of low molecular weight have been studied by amperometric and spectrophotometric titrations. Cysteine and cysteamine form complexes with silver containing up to 1.5 Ag + /—SH. The ligands participating in the binding of silver are the —SH and amino groups. Under some con…
The high‐temperature thermal expansion of monoclinic Nb 2 O 5 was studied with X‐ray and dilatometric techniques. The X‐ray axial thermal expansion was anisotropic; the mean coefficients in the a, b , and c directions, respectively, were 5.3, 0, and 5.9×10 −6 °C ‐1 from room temperature to 1000°C. It is proposed that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy of some nickel dithiolate complexesSamuel O. Grim, Luis J. Matienzo, and William E. Swartz Jr.Cite this: J. Am. Chem. Soc. 1972, 94, 14, 5116–5117Publication Date (Print):July 1, 1972Publication History Published online1 May 2002Published ini…