Materials Literature
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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…
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…
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.…
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…
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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropoly Blues. I. Reduction Stoichiometries and Reduction Potentials of Some 12-TungstatesMichael T. Pope and Gideon M. Varga Jr.Cite this: Inorg. Chem. 1966, 5, 7, 1249–1254Publication Date (Print):July 1, 1966Publication History Published online1 May 2002Published iniss…
Many solid state reactions can be represented by equations of the type F (α) = kt , where α is the fraction of material reacted in time, t. These equations can be expressed in the form F (α) = A ( t/t 0.5 ) where t 0.5 is the time for 50% reaction and A is a calculable constant depending on the form of F (α). Numerica…
Stereological principles provide efficient and reliable tools for the determination of quantitative parameters of tissue structure on sections. Some principles which allow the estimation of volumetric ratios, surface areas, surface-to-volume ratios, thicknesses of tissue or cell sheets, and the number of structures ar…
Abstract In discussing the structure of polyvinyl chloride as a function of the polymerization temperature, the effect of the stereoregularity and the branching should be principally taken into consideration. In the present work, in order to investigate the effect of the polymerization temperature on these two structu…
Abstract An der Oberfläche von Festkörpern sind häufig strukturfremde Atome oder Atomgruppierungen gebunden. Die Chemie dieser „End‐Gruppen”︁ an der Festkörperoberfläche wird an einigen Beispielen besprochen. Bei Diamant und graphitischem Kohlenstoff und auch noch bei Siliciumdioxid sind die Fremdatome covalent gebund…
"Osmium black," a pigment very useful for cytological staining in both light and electron microscopy, may be deposited selectively at the tissue-binding sites of other metal ions by bridging OsO(4) to the tissue bound metal ion through a multidentate ligand.
Abstract The changes in dimensions and linear thermal expansion coefficients of several polycrystalline graphites irradiated at 170 and 200 °C are presented. The results are compared with the changes in these parameters which were observed in very highly oriented pyrolytic polycrystalline graphite and were discussed i…
Abstract Measurements are reported of the principal strains and changes in principal thermal expansion coefficients of various grades of pyrolytic graphite after fast-neutron bombardment at constant temperatures in the range 150 to 650 °C. The pyrolytic graphites used in these studies possess properties approaching th…
The phase diagrams of Na2WO4 and Na2MoO4 have been determined to 40–45 kbar. Two new high-pressure phases have been found for Na2WO4. The 440°C transition in Na2MoO4 consists of two transitions very close together. A further new high-pressure phase has been found. Crystallographic data are given for Na2WO4 I and Na2Mo…
Three-dimensional neutron-diffraction data have been collected for both the room-temperature (paraelectric) and the low-temperature (ferroelectric) phases of ammonium sulfate. Both phases are ordered. The transition, occurring at 223°K and involving a change from Space Group Pnam at room temperature to Space Group Pna…
Electron bombardment of ZnSe at 80\ifmmode^\circ\else\textdegree\fi{}K results in the production of two fluorescence bands at 5460 and 5850 \AA{}. The threshold for damage at 80\ifmmode^\circ\else\textdegree\fi{}K is 240 keV. When the sample is cooled to 4.2\ifmmode^\circ\else\textdegree\fi{}K following bombardment at…
A ferroelectric crystal can be considered as a (slight) modification of a certain nonferroelectric ideal crystal which is referred to as the "prototype" of the ferroelectric crystal; in crystallographical symmetry, the prototype should be higher than the ferroelectric crystal and equal to the paraelectric phase if pos…
Polycrystalline copper and aluminum were bombarded below 6\ifmmode^\circ\else\textdegree\fi{}K with monoenergetic electrons with energies in the range 0.15 to 2.1 MeV. The production rates of electrical resistivity were measured and the threshold energies for atom displacement were found to be 19\ifmmode\pm\else\textp…
Infrared-reflectivity measurements were made from 200 ${\mathrm{cm}}^{\ensuremath{-}1}$ to 800 ${\mathrm{cm}}^{\ensuremath{-}1}$ at temperatures ranging from 7.5 to 1060\ifmmode^\circ\else\textdegree\fi{}K for LiF and from 8 to 1950\ifmmode^\circ\else\textdegree\fi{}K for MgO. The reflection spectra were analyzed by m…
Abstract Cationic copolymerization of 1,3‐dioxolane with styrene was performed in toluene solution at 25°C. using boron fluoride etherate as catalyst. Determination of formaldehyde units in the copolymer showed that the two monomer units formed somewhat longer sequences in the copolymer chain than calculated on the as…