Materials Literature
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The conductivity and the Hall and Seebeck coefficients of reduced and doped strontium titanate were measured over the temperature range 4.2-300\ifmmode^\circ\else\textdegree\fi{}K. An average effective mass of about 10 ${m}_{0}$ was deduced from these experiments. This value agrees well with the results of a recent en…
Abstract 9‐Allylcarbazole, 9‐Δ 3 ‐butenylcarbazole, 9‐Δ 4 ‐pentenylcarbazole and 9‐Δ 5 −hexenylcarbazole were synthesized and their polymerization with Z IEGLER ‐N ATTA catalyst systems studied. 9‐Allylcarbazole could not be polymerized and 9‐Δ 3 ‐butenylcarbazole could only be polymerized with extreme difficulty. How…
Abstract The molecular structure of polyethylene oxide (PEO), (—CH 2 CH 2 O‐) n , was studied by the X‐ray diffraction and infrared absorption spectroscopic methods. The X‐ray diffraction data were observed for the highly oriented PEO samples and were analyzed by use of the method of FOURIER transform of the helix pro…
A quantitative description of the capillary hysteresis properties of a porous material is developed through bivariate distribution density function ƒ(α, β), where α and β are wetting and drying potentials. This is formally equivalent to the independent domain theory of Poulovassilis. The similarity hypothesis (implyin…
Measurement of transmitted phonon drag across 10 ohm cm $p$-type silicon indicates a phonon mean free path of the relevant thermal phonons which varies from about 80 \ensuremath{\mu} at 77\ifmmode^\circ\else\textdegree\fi{}K to 12 \ensuremath{\mu} at 250\ifmmode^\circ\else\textdegree\fi{}K. The values depend on the me…
A measurement of the quantum efficiency of silicon has been carried out over the photon energy range from 4.9 to 21.2 eV by measuring the photoresponse of silicon surface-barrier photodiodes. The quantum efficiency increases from 2.0 at $h\ensuremath{\nu}=4.9$ eV to approximately 3 at $h\ensuremath{\nu}=6$ eV; between…
The absolute reflection spectrum of type IIa diamond was measured at room temperature from 4 to 30 eV and analyzed by dispersion techniques to obtain the optical parameters. Structure observed in the dielectric constant near 7, 12, 16, 20, and 24 eV was attributed to interband transitions at critical points in the joi…
Allotropes of lanthanum, cerium, praseodymium, and neodymiumc have been observed at elevated pressures with an x-ray diffraction camera which incorporates a diamondanvil, high-pressure cell. In each case a high-pressure modification was observed which has a face-centered cubic structure. At room temperature the unit c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT17-Azasteroids. I1Sumanas Rakhit and Marcel GutCite this: J. Org. Chem. 1964, 29, 4, 859–862Publication Date (Print):April 1, 1964Publication History Published online1 May 2002Published inissue 1 April 1964https://pubs.acs.org/doi/10.1021/jo01027a022https://doi.org/10.1021/j…
Pyrenoids of 6 diatoms, Acnanthes minutissima, Cyclotella meneghiniania, Cymbella affinis, Gomphonema parvulum, Nitzschia sp., and Surirella ovalis, were examined comparatively with the electron microscope. All except those of G. parvulum were membrane-limited. The pyrenoid membrane forms a ridge around the pyrenoid o…
Schmidt's functional equation determining the vibrational spectrum of a disordered, linear system is solved numerically for some chosen parameters. The resulting spectrum is found to agree very well with the corresponding spectrum obtained by Dean in 1960 but to differ appreciably from the results of the moment-trace…
Abstract Copolymers of ethyl acrylate with three different dimethacrylates were prepared over the complete range of copolymer composition. Modulus temperature curves of these polymers were constructed and contrasted with the modulus temperature curves of phenol–formaldehyde type polymers. The ethyl acrylate–dimethacry…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the Origin of Unpaired Electrons in Metal-Free PhthalocyanineJ. M. Assour and S. E. HarrisonCite this: J. Phys. Chem. 1964, 68, 4, 872–876Publication Date (Print):April 1, 1964Publication History Published online1 May 2002Published inissue 1 April 1964https://pubs.acs.org…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Adsorption of Water Vapor onto Silver IodideNoubar Tcheurekdjian, A. C. Zettlemoyer, and J. J. ChessickCite this: J. Phys. Chem. 1964, 68, 4, 773–777Publication Date (Print):April 1, 1964Publication History Published online1 May 2002Published inissue 1 April 1964https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Determination of the Crystal Structure of Potassium Rhenium HydrideK. Knox and A. P. GinsbergCite this: Inorg. Chem. 1964, 3, 4, 555–558Publication Date (Print):April 1, 1964Publication History Published online1 May 2002Published inissue 1 April 1964https://doi.org/10.…
Pyrenoids of 6 diatoms, Acnanthes minutissima, Cyclotella meneghiniania, Cymbella affinis, Gomphonema parvulum, Nitzschia sp., and Surirella ovalis, were examined comparatively with the electron microscope. All except those of G. parvulum were membrane‐limited. The pyrenoid membrane forms a ridge around the pyrenoid o…
The properties of TaS3, TaSe3 and TaTe4 have been studied by means of X-ray diffraction, density and magnetic susceptibility measurements: TaS3 crystallizes orthorhombic with TaSe3 crystallizes monoclinic with TaTe4 crystallizes tetragonal with The compounds have diamagnetic susceptibilities.
Abstract Während durch extrem scharfes Abschrecken dünner Schichten von geschmolzenem Bi 2 O 3 das bei Zimmertemperatur metastabile β‐BiO 1,50 hergestellt werden kann, entstehen durch Umsetzung von Bi oder Bi 2 O 3 + C im Graphit‐Schiffchen mit Sauerstoff ≥ 800°C Präparate der Zusammensetzung β‐BiO > 1,50 . Die Pha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Copper-Ferric Chloride Reaction and the Effects of Certain InhibitorsW. H. Burrows, C. T. Lewis Jr., D. E. Saëre, and R. E. BrooksCite this: Ind. Eng. Chem. Process Des. Dev. 1964, 3, 2, 149–159Publication Date (Print):April 1, 1964Publication History Publish…
The effects of package dimensions, structure, and density on the flow of air and water through yarn packages have been investigated. Packages are considered as homogeneous porous bodies, and the experimental results are correlated by theoretical relationships based on Darcy's law and the Kozeny–Carman equation. The pa…