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Abstract Shortly, lightweight, inexpensive, precision, space‐filling atomic models particularly suitable for constructing macromolecules of biological interest will reach the scientific community. The availability of the models, the Corey‐Pauling‐Koltun, or C‐P‐K Models, will conclude a five‐year program which has inv…
Ceramic and electrical properties and crystal structures of the system Pb(Mg l/3 Nb 2/3 ‐ PbTiO 3 ‐PbZrO 3 are described. The system is composed of three crystal phases at room temperature: pseudocubic, tetragonal, and rhombohedral. A high dielectric constant and radial coupling coefficient and low resonant resistance…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Dissociation Energy of the Tetrasulfide LinkageI. Kende, T. L. Pickering, and A. V. TobolskyCite this: J. Am. Chem. Soc. 1965, 87, 24, 5582–5586Publication Date (Print):December 1, 1965Publication History Published online1 May 2002Published inissue 1 December 1965https:/…
Extensive and accurate viscosity values for molten B 2 O 3 are reported over the continuous range from 20 poises (at 1400°C) to 10 10 poises (at 318°C). The measurements were made with a wide‐range rotating‐cylinder viscometer. The melts were pretreated by bubbling superdry nitrogen through them to ensure a minimum wa…
The symmetry properties of the third-rank tensor β which comprises the set of coefficients of quadratic terms in the expansion of the induced-dipole moment in the electric field are investigated, and the various linear combinations belonging to the irreducible representations are tabulated for the important molecular…
Previous investigators have shown that natural chromium-bearing spinel solid solutions adhere closely to the general formula (Mg, Fe ++ ) (Cr, Al, Fe +++ ) 2 O 4 and may therefore be graphically portrayed in a triangular prism, the length of which represents the ratios MgO/FeO, and the cross section the relative propo…
The variation with magnetic field of the surface reactance of gallium single crystals at 2 Mc/sec has been investigated at helium temperatures and for fields up to 1500 G. The changes observed in the surface reactance depend in a very complicated way upon magnetic field, and correspond to variations of nearly 100% in…
At very low temperatures the thermal conductivity of insulating crystals containing point defects is limited by boundary relaxation processes and by Rayleigh scattering of long-wavelength phonons: at higher temperatures resonant modifications of Rayleigh scattering and phonon-phonon scattering dominate. Experiments by…
A theory of acoustic-mode scattering has been formulated within the tight-binding approximation of band theory, and has been applied to narrow-band semiconduction in organic molecular crystals. The latter problem has been treated previously only in terms of phenomenological scattering parameters. The interaction const…
The paramagnetic susceptibility and magnetic specific heat of the complex salt [${\mathrm{Cr}}_{3}$${(\mathrm{C}{\mathrm{H}}_{3}\mathrm{C}\mathrm{O}\mathrm{O})}_{6}$ ${(\mathrm{OH})}_{2}$]-Cl\ifmmode\cdot\else\textperiodcentered\fi{}8${\mathrm{H}}_{2}$O are examined theoretically in the light of recently obtained know…
This paper discusses the differential cross section for pair production by electron scattering off an arbitrary fixed potential (trident). This cross section assumes that the three outcoming electrons' energies are to be measured. A modified version of the Monte Carlo procedures is used to obtain the cross section. Th…
Abstract In an extension of studies on the exchange of meso-hydrogen in porphyrins and reduced porphyrins (R. Bonnett & G.F. Stephenson, unpublished results) the nuclear magnetic resonance spectra of natural corrinoid derivatives have been investigated. Since it was hoped to observe a signal due to the CIO proton…
Abstract Corroles have been prepared by the irradiation of basic solutions of 1,19-dideoxybiladienes-ac. Some physical and chemical properties of corroles are described including the formation of the aromatic corrole anions. Cyclization of the nickel derivative of a 1,19 dimethyl-1,19- dideoxybiladiene-ac gives a macr…