Hopping Conduction in NiO
Received 15 February 1965DOI:https://doi.org/10.1103/PhysRevLett.14.497©1965 American Physical Society
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Polymerization of δ‐valerolactone and preparation of a thermostable derivative from its polyester
Abstract The kinetics of the polymerization of δ‐valerolactone initiated with ethylene glycol or monoethanolamine has been studied. An activation energy of 6.4 kcal./mole was obtained, and the mechanism of polymerization was also discussed. Though the produced polymer, a polyester with two alcoholic end‐groups, is eas…
Knight Shift Anisotropy in Scandium and Yttrium and Nuclear Quadrupole Coupling in Scandium
The anisotropic Knight shift of the ${\mathrm{Sc}}^{45}$ and ${\mathrm{Y}}^{89}$ nuclear magnetic resonances (nmr) in polycrystalline scandium and yttrium metal, respectively, has been observed and measured at room temperature by means of the magnetic field dependence of the \textonehalf{} \ensuremath{\leftrightarrow}…
Theory of EPR of Ti3+ in Trigonal Environments
For a single d electron in a trigonal environment, the complete ligand-field Hamiltonian, including the interactions with the upper states of the cubic splitting, has been diagonalized in order to re-examine critically the theory of the EPR spectra of various Ti3+ compounds. The compounds for which there are adequate…
Multiple-Band Conduction inn-Type Rutile (TiO2)
The existence of multiple-band conduction in $n$-type rutile for temperatures above \ensuremath{\approx}40\ifmmode^\circ\else\textdegree\fi{}K is deduced from studies of the Hall coefficients and electrical conductivities from \ensuremath{\approx}2 to 600\ifmmode^\circ\else\textdegree\fi{}K. This investigation emphasi…
Deduction of the Zero Differential Overlap Approximation from an Orthogonal Atomic Orbital Basis
The validity of the zero differential overlap approximation is investigated by means of a systematic expansion in terms of a parameter of the order of magnitude of a typical overlap integral between neighboring atoms. The terms of the Fock operator in a basis of orthogonal atomic orbitals can be arranged after differe…
Electronic Band Structure of TiC, TiN, and TiO
The band structure of metallic face-centered cubic TiC, TiN, and TiO has been obtained by the augmented-plane-wave (APW) method at the equivalent of 256 points in the Brillouin zone and for an energy range appropriate to cover the nonmetal $2s$ and $2p$ and the titanium $3d$ and $4s$ states. A density of states, the F…
Experimental control of oxygen fugacities by graphite-gas equilibriums
Control of oxygen fugacities in a CO + CO atmosphere has been established experimentally by using a solid-phase buffer technique. Equilibration between the buffer and the enclosed sample is established by diffusion of the gas atmosphere through the buffer. The establishment of equilibrium by this method is indicated b…
Experimental Evidence for Double Electron Emission in an Auger Process
Received 13 January 1965DOI:https://doi.org/10.1103/PhysRevLett.14.390©1965 American Physical Society
Irradiation Damage in Type I Diamond
In addition to the GRI and uv bands induced in all diamond by 0.78-MeV electron irradiation, another optical absorption feature, which we have named the ND1 band, is found in all Type I diamonds. A single EPR line appears to be associated with the ND1 band. It is suggested that the ND1 center arises from the combinati…
Siderite (FeCO 3 ): Thermal Decomposition in Equilibrium with Graphite
The thermal stability of siderite (FeCO(3)) was studied by two independent methods in which the oxygen fugacity of the gas phase was controlled by equilibration with graphite. Both series of experiments indicate that siderite decomposes stably to magnetite + graphite between 455 degrees and 465 degrees C at 500 to 200…
Crystallization and Molecular Folding
The long-chain nature of the polymer molecule, together with the usual broad distribution of molecular lengths, makes it kinetically very unlikely that the molecule will achieve, on crystallization, its thermodynamically most stable form. Under most crystallization conditions a large portion of the polymer molecules c…
Shubnikov-de Haas Effect in SnTe
Received 2 February 1965DOI:https://doi.org/10.1103/PhysRevLett.14.360©1965 American Physical Society
Mass transfer in horizontally moving stable aqueous foams
Abstract An efficient gas absorption device has been developed based on a stable aqueous foam moving in a horizontal duct, with a gas‐liquid interaction that causes only negligible pressure drops. The study of a liquid‐phase and a mostly gas‐phase‐controlled system has indicated that their mass transfer performance ca…
Relative enthalpy of polytetrafluoroethylene from 0 to 440 °C
Using a drop method and an ice calorimeter, precise measurements of enthalpy relative to 0 °C were made on a sample of granular polytetrafluoroethylene which was initially 95 percent crystalline. The measurements were at temperatures every 50 degrees from 50 to 300 °C (both before and after melting and quenching); and…
Studies on Adsorption of Oxygen on γ-Alumina. Nature of Adsorbed Species1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on Adsorption of Oxygen on γ-Alumina. Nature of Adsorbed Species1L. N. Mulay and L. K. KeysCite this: J. Am. Chem. Soc. 1965, 87, 6, 1192–1195Publication Date (Print):March 1, 1965Publication History Published online1 May 2002Published inissue 1 March 1965https://pub…
A study of uvarovite
Summary Uvarovite and its relationships with grossular and andradite have been studied in order to understand better the geochemistry of uvarovite. Synthese have been carried out under both dry and hydrothermal conditions; a solid solution with grossular was obtained under both conditions, but with andradite only unde…
The elasticity of polycrystalline graphite
The elastic displacement of screw dislocations bounding the lamellar grains is of the correct order of magnitude to account for the observed elasticity of reactor grade graphite. The change of elastic modulus on irradiation cannot be explained in terms of the pinning of these or of other dislocations by the clusters o…
Oriented transformation of manganite during heat treatment
Summary The transformation of manganite during heating has been studied by single crystal X-ray diffraction methods. It is observed that manganite transforms into pyrolusite keeping its original axial directions parallel to those of the transformed phase. Pyrolusite then transforms into Mn 2 O 3 with its [001] ‖ [110]…
Correlation of temperature and grain size effects in the ductile-brittle transition of molybdenum
An experimental investigation of the effects of temperature and grain size on the tensile properties of high purity molybdenum showed that transitions from ductile to brittle behaviour occur with both decreasing temperature and increasing grain size. Based on the assumed temperature-independence of the critical stress…