Materials Literature
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The spectrum of the recombination radiation from diamond has been measured over the photon energy range 4.9-5.5 eV at 90, 160, 207, and 320\ifmmode^\circ\else\textdegree\fi{}K. At 90\ifmmode^\circ\else\textdegree\fi{}K, recombination emission has been detected from ten samples out of a batch of fifteen single crystals…
Received 17 February 1964DOI:https://doi.org/10.1103/PhysRevLett.12.275©1964 American Physical Society
The physical model of two-dimensional p-electron delocalization proposed by Bersohn for crystalline iodine is examined. The principal features of the model are adopted, including the Hückel method for writing one-electron orbitals and the restriction to nearest nonbonded neighbor interactions. Crystal symmetry is expl…
The vaporization behavior of the systems boron—carbon and boron—carbon—silicon has been studied with a mass spectrometer. In addition to the gaseous species characteristic of graphite, silicon carbide and boron, the molecules BC2, B2C, BCSi, BSi2, BC, and BSi were identified and their atomization energies measured. Th…
By classifying particle center positions with a hexagonal grid, evaluation of the two-dimensional rigid sphere partition function is reduced to a special lattice statistics problem, with precisely defined nearest-neighbor effective pair interactions. The hexagonal cell size is chosen to be the maximum consistent with…
A framework for interpreting experiments on Doppler shifts in light scattering from pure liquids and polymer solutions is presented. The spectral density of the light scattered into a given frequency range and angle by a liquid composed of identical, isotropic particles much smaller than the wavelength of the incident…
ONE-DIMENSIONAL DISOI~DER IN SODIUM 2-OXOCAPRYLATE respectively are normal.These contacts are as follows : C(x, y, z)-C(~, ~, z) 4.02 A C(x, y, z)-C(~, 1-y, z) 4.29 C(x, y, z)-C(~, y, z-½) 4-12 C(x,y,z)-C(5, y,z+½) 4.12The structure analysis has been only recently completed, and it has therefore not yet been possible…
The formation of a silver ferrite of empirical formula AgFeO~ by reactions involving iron hydroxides and silver compounds in aqueous suspensions was reported by The initial interest of these authors was in use of the red-colored silver compound in identification of specific iron hydroxide compounds. The products obtai…
Crystals of MgSO~. 6H20 are monoclinic, space group C2/c, with 8 formula units in the unit cell with dimensions a=10.110, b=7.212, c=24.41 A; fl=98.30 .
Oxygen vacancies and their effects on electrical conduction in some metal oxides were considered through an exact solution of the equilibrium relations between oxygen partial pressure in the ambient gas and concentrations of oxygen vacancies and conduction electrons in the oxide. The mass-action law was assumed but no…
Magnetic resonances and susceptibilities are calculated for various allowed magnetic structures in orthoferrites and similar magnetic perovskites. The calculation is based on a general form for the free energy which includes canting contributions from both single-ion anisotropy and antisymmetric exchange, and which as…
In this paper the dispersion relation for second sound in solids is derived. The starting point of the analysis is a Boltzmann equation for a phonon gas undergoing a temperature perturbation $\ensuremath{\delta}{T}_{0}{e}^{i(\mathbf{k}\ifmmode\cdot\else\textperiodcentered\fi{}\mathbf{x}\ensuremath{-}\ensuremath{\omega…
Abstract Some molecular complexes of the salt type have been prepared from phenazinium chloride or methosulfate and pyrene or p-hydroquinone. It has been confirmed that (1) the constitution, the color and the melting point of the molecular complexes varied with the drying conditions; (2) the ultraviolet absorption spe…
Abstract The density of polyethylene produced by free‐radical‐initiated batch polymerization at elevated pressures and temperatures was found to be determined by the amount of short‐chain branching and the molecular weight. The short‐chain branching was shown to depend solely upon the pressure and temperature of polym…
Magnetization measurements on single crystals of gadolinium yield a Curie temperature of 290±1°K, determined by a plot of M2 vs H/M. Measurements of magnetization vs applied field extrapolated to zero field show appreciable magnetic order above this temperature. X-ray lattice parameter measurements on the same crystal…
Isothermal transformation kinetics are described for four uranium-base alloys: U--8 Mo, U--10 Mo, U--8 Mo-1/2 Ti, and U-- 8 Mo-- 1 Ti. The time- temperaturetransformation (TTT) diagrams presented are based on metallographic, dilatometric, microhardness, and x-ray-diffraction data. For the alloys under investigation, t…
Light has been detected from the vaporous cavitation induced in flowing tap water by a fall in pressure as it passed through the constriction of a Venturi tube. The intensity of this light was several orders of magnitude less than that of the corresponding `sonoluminescence', the light emitted from vaporous cavitation…
The composition range for growing tetragonal scheelite-type single crystals, was investigated and located on the ternary diagram Gd2O3–MoO3–Na2O. Single crystals, the largest one weighing more than 1.2 g, and having a composition of R0.5Na0.5MoO4, with R=Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Yb, were grown by slowly coo…
The hexagonal ferrites, of current interest because of their high-frequency properties, are being studied by single-crystal x-ray methods. A new rhombohedral member of the group, ideally Ba4Zn2Fe52O84, has been identified. The centrosymmetric space group is R3̄m; referred to hexagonal axes, c=153.85 Å, a=5.88 Å, and t…
Measurements were taken at room temperature and at liquid-nitrogen temperature of the magneto-resistance of nickel and nickel-iron alloy thin films. The transverse magnetoresistance data, with current in a [110] direction, of Δρ/ρ0 vs θ, where θ is the angle between the plane of the film and the direction of the magne…