Materials Literature
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The Raman spectra of LaAl${\mathrm{O}}_{3}$, PrAl${\mathrm{O}}_{3}$, and NdAl${\mathrm{O}}_{3}$ have been observed at temperatures from 10 to 1135\ifmmode^\circ\else\textdegree\fi{}K. Each of these materials evidences a nominally second-order trigonal cubic phase transition; that in LaAl${\mathrm{O}}_{3}$ has previous…
The appearance of phase-contrast, Fresnel fringes and various forms of diffraction contrast in images produced by transmission scanning electron microscopes can be understood simply by invoking the principle of reciprocity to equate the imaging conditions to those relevant to a conventional electron microscope.
Expressions are derived for the voltage and current in insulators under charge limited conditions using running wave expression for the charge carriers, taking into account displacement and field induced currents. Using these the frequency characteristics of the voltage, current and impedance is derived. It is seen th…
Article Kinetic Study of the Thermal Decomposition of Cobaltous Carbonate at Atmospheric Pressure was published on July 1, 1969 in the journal Zeitschrift für Physikalische Chemie (volume 241O, issue 1).
The focal properties and spherical aberration of a simple model of a field omission electron gun are investigated theoretically. Results are presented graphically. For a fixed source position, spherical aberration decreases as the grid aperture increases, but for a fixed image position, spherical aberration decreases…
Magnetomechanical damping measurements are commonly made using wire specimens in a torsion pendulum. Twisting the cylindrical wires produces tensile stresses along a helix. An analytical study was made relating the direction of these stresses with the directions of the crystallographic axes assuming three different or…
Measurements of the thermionic emission and electrical conductivity as a function of the temperature for fixed states of activation were obtained for each of the four barium chalcogenides. From the temperature dependences of these quantities the electron affinities were determined. The values obtained were 0.57 for Ba…
Abstract Polymer‐polymer interaction was used for the preparation of graft polymers of polyethylene oxide on starch. Preformed polyethylene oxide having hydroxyl end groups was converted to the chloroformate derivative and reacted with starch alkoxide. Watersoluble graft polymers were obtained free of cross linking. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel oxidative fragmentation. The formation of benzyl azide from the reaction of 1,1,4,4-tetrabenzyltetrazene with lead tetraacetateGen Koga and Jean P. AnselmeCite this: J. Am. Chem. Soc. 1969, 91, 15, 4323–4324Publication Date (Print):July 1, 1969Publication History Publi…
The excellent high-temperature mechanical properties and other desirable characteristics of polybenzimidazole (PBI) polymer systems make these systems attractive candidates for development as ablative heat-shield materials. This paper describes the formulation of several new low-density polybenzimidazole composites. T…
Abstract The effect of the room‐temperature first‐order transition on the plastic yield behavior of polytetrafluoroethylene (PTFE) has been investigated. Stress‐strain curves were measured at different strain rates and temperatures. Tensile creep under constant dead load was also measured as a function of temperature…
The set of optical constants of germanium reported by Marton and Toots, from 8 to 25 eV, have been assessed and found to be internally consistent to within ±5%. An extension of the n and k values up to photon energy of 100 eV using Hunter's k values also has been studied. The analysis consisted of an internal consiste…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of bivalent sulfur compounds-copper(II) complexesTeruaki Mukaiyama, Koichi Narasaka, and Hisao HokonokiCite this: J. Am. Chem. Soc. 1969, 91, 15, 4315–4317Publication Date (Print):July 1, 1969Publication History Published online1 May 2002Published inissue 1 July 19…
Abstract Physical characteristics of rubber network structures usually enumerated and discussed are network chain density, crosslink functionality, average chain length between crosslinks, entanglements which act somewhat like crosslinks, and free chain ends which are network defects. Chemical factors include structur…
Ac and dc conductivity, tunneling, and optical transmission and reflectance studies have been made on amorphous and crystalline (rhombohedral and NaCl) GeTe films (80 Å to 10 μ thick) prepared by evaporation and by sputtering. The crystalline films behave like a p-type degenerate semiconductor with Fermi level ∼0.3–0.…
Abstract Neu dargestellt wurde Na 3 CuO 3 durch Erhitzen von Na 2 O 2 /CuO‐Mischungen auf 630°C unter O 2 . Nach Einkristalluntersuchungen kristallisiert Na 3 CuO 3 triklin: a = 18,25 5 ; b = 16,78 5 ; c = 11,12 9 Å; α = 136,2; β = 106,9; γ = 90,6°; Z = 36.
Abstract The effect of sulfur, MBT, zinc oxide and stearic acid, either singly or in mixtures, on the DCP vulcanization of NR has been studied. In all cases DCP decomposes by a first order law, but the rate constant is higher in presence of MBT. Sulfur and MBT, separately or together reduce the crosslink density, each…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. P. Chauvineau, P. Croce, G. Devant, M. F. Verhaeghe; Recrystallization of Thin Gold Films: Inf…
Abstract The kinetics of the phase transformation of anatase to rutile was studied by means of X-ray diffraction. Samples of anatase were prepared by sulfate and chloride processes. The kinetic data could well be expressed by the equation α=1−e−btn, where α is the fraction of anatase transformed in time t, and b and n…
In electron microscopy, and particularly in small-angle electron diffraction, the electric charging of thin insulating films, which are frequently used to support specimens, has been regarded as a nuisance and techniques have been developed to minimize it. One particular phenomenon, however, has been of scientific int…