Elastic constants of synthetic single crystal corundum
The elastic constants of synthetic single crystal corundum (aluminum oxide) were calculated from 0 to 900 °K from data obtained by a resonance technique from 80 to 900 °K.
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Vacancy Ordering in Epitaxially-Grown Single Crystals of γ-Fe2O3
Single crystal films of γ-Fe 2 O 3 were epitaxially grown on a (100) surface of MgO by the halide-decomposition method. Chemical analysis, electrical conductivity and, optical absorption measurements showed that the crystals contain no ferrous ions. X-ray diffraction assigned a cubic spinel structure and ruled out the…
Reactions Between Silica and Graphite
Reactions between silica and graphite were studied in vacuum from 1445° to 1765°C by continuously measuring the amount of carbon monoxide formed. At low temperatures and/or short times, the reaction followed a linear rate law with an apparent activation energy of 117 kcal. At higher temperatures and/or longer times, t…
Electrochemical Measurement of Low Corrosion Rates
Materials with corrosion rates of 0.1 mpy or less are required in many applications. In this investigation, application of linear polarization to measurement of low corrosion rates is examined. Also, two new electrochemical techniques are derived theoretically and verified experimentally. These methods can measure acc…
Effect of High Pressure on the Lattice Parameters of Cr2O3 and α-Fe2O3
The effect of pressure to several hundred kilobars has been measured on Cr2O3 and α-Fe2O3. Both have the corundum structure. Results are compared with previously published data for Al2O3. Cr2O3 exhibits a compressibility which decreases markedly with increasing pressure; Al2O3 has a compressibility nearly independent…
Matrix Algebra for the Biological Sciences S. R. Searle
Journal Article Matrix Algebra for the Biological Sciences Get access Matrix Algebra for the Biological Sciences. By Searle S. R.. John Wiley & Sons, Inc., New York, 1966. 296 pp., $9.95. Frederick E. Smith Frederick E. Smith Search for other works by this author on: Oxford Academic Google Scholar BioScience, Volume 1…
Diffraction contrast from elastic shear strains due to coherent phases
Electron transmission microscopy and diffraction reveal that the precipitation of {100} disc-shaped G.P. zones in a copper-2% beryllium alloy is accompanied by the appearance of striations parallel to the traces of {110} planes in the microstructure and < 110 > relrods normal to these planes in diffraction patterns. U…
Thermally resistant polymers containing the s‐triazine ring
Abstract Aromatic dinitriles cyclize to form aromatic polymers containing the s ‐triazine ring. In this paper, these polymers are compared thermally with each other and with aromatic melamine polymers prepared via the aromatic diamine and cyanuric chloride. One perfluoroaromatic melamine polymer was prepared and compa…
HALL EFFECT AND ELECTRICAL CONDUCTIVITY OF Cu2O MONOCRYSTALS
Hall-effect and electrical conductivity measurements were performed on Cu 2 O single crystals both before and after heating the samples in vacuo at temperatures ranging from 200 °C to 800 °C. Both the absolute values of the mobility and the conductivity, as well as their temperature dependence, were found to be strong…
DISLOCATION DIPOLES AND DISLOCATION LOOPS
Basic theoretical ideas on the properties of two special dislocation configurations, dislocation dipoles and prismatic dislocation loops, are presented. Some of the author's recent results, based mostly on the application of the model of elastic continuum on these crystalline defects, are also given. The influence of…
Simultaneous Determination of Surface Area and Cation‐Exchange Capacity
Abstract In previous work it was found that Cl repulsion by arid‐zone soi's from a solution having a high and uniform concentration of Cl is closely related to surface area as measured by ethylene glycol retention. Based on this information, a measurement of Cl repulsion has been incorporated into the NaOAc method for…
The Synthesis of Aluminoles via the Addition and Cyclization Reactions of Arylaluminum Compounds1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Synthesis of Aluminoles via the Addition and Cyclization Reactions of Arylaluminum Compounds1John J. Eisch and William C. KaskaCite this: J. Am. Chem. Soc. 1966, 88, 13, 2976–2983Publication Date (Print):July 1, 1966Publication History Published online1 May 2002Published…
Some factors affecting the relation between the clay minerals in soils and their plasticity
Abstract The clay mineral composition is one of the factors that affect the physical properties of soils, and a knowledge of it is required to promote a fuller understanding of the origin of these properties. The relationships between the clay content and the plastic and liquid limits of natural montmorillonitic and k…
Water vapour transmission properties of free polymer films
Abstract The water vapour transmission properties of selected hydrophilic, lipophilic, and mixed hydrophilic-lipophilic polymer systems, cast as free films, have been examined as a function of time, film thickness, plasticiser concentration, and film formulation. An inverse linear relationship was established between…
2-Amino-5-Substituted 1,3,4-Oxadiazoles and 5-Imino-2-Substituted Δ2-1,3,4-Oxadiazolines. A Group of Novel Muscle Relaxants
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2-Amino-5-Substituted 1,3,4-Oxadiazoles and 5-Imino-2-Substituted Δ2-1,3,4-Oxadiazolines. A Group of Novel Muscle RelaxantsHarry L. Yale and Kathryn LoseeCite this: J. Med. Chem. 1966, 9, 4, 478–483Publication Date (Print):July 1, 1966Publication History Published online1 Ma…
Dislocations and persistent slip bands in fatigued copper
Persistent slip bands in fatigued OFHC copper single crystals have been examined using both replica and transmission electron microscopy techniques. In general, the dislocation structure below persistent slip bands is found to consist of rows of elongated cells within a region extending at least 170 microns below the…
High‐Temperature Elastic Properties of Polycrystalline MgO and Al 2 O 3
Adiabatic bulk modulus, B s , of polycrystalline MgO and Al 2 O 3 was measured from 298° to 1473°K using the resonance technique. The Grüneisen constant, calculated from the measured bulk modulus, was constant over the whole temperature range (1.53 for MgO and 1.34 for Al 2 O 3 ). Another important parameter, , is con…
TE-wave scattering by a dielectric cylinder of arbitrary cross-section shape
The theory and equations are developed for the scattering pattern of a dielectric cylinder of infinite length and arbitrary cross-section shape. The harmonic incident wave is assumed to have its electric vector perpendicular to the axis of the cylinder, and the fields are assumed to have no variations along this axis.…
Covalent bonding and magnetic properties of transition metal ions
This review is mainly concerned with octahedrally co-ordinated ions with an unfilled d shell. The wave functions of the magnetic electrons are considered first, the covalency being taken into account by admixing ligand s and p orbits into the central ion d orbits. The origin of these admixtures is discussed in a simpl…
Gentnerite, Cu8Fe3Cr11S18, a new Mineral from the Odessa Meteorite
In his paper "Mineralbestand und Strukturen der Graphit-und Sulfideinschlsse in Eisenmeteoriten" EL GORESY 1 reported the presence of a new Cu-, Cr-sulfide in some graphite-troilite nodules from the Odessa meteorite. No optical or analytical data were, however, published, since the small size of the grains observed di…