Luminescence of barium molybdate (BaMoO4)
Luminescence spectra are reported for BaMoO4. Thee emission occurs only for samples precipitated from acid solutions. Samples show at liquid helium temperature a green emission. (AIP)
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Temperature Dependence of the Average Mobility in Graphite
The average mobility (\barµ) of majority carriers evaluated from the magneto-resistance of highly oriented graphite through B 2 /( Δ ρ/ρ 0 )=( c /\barµ) 2 +O( B 2 ) is proportional to T -1.6 between 40 K and 80 K, and T -1.2 above 80 K. The T -1.2 dependence was observed by Soule and is in agreement with the theory of…
Synthesis, photodegradation, and energy transfer in a series of poly(ethylene terephthalate–co–2,6‐naphthalenedicarboxylate) copolymers
Abstract Triplet–triplet energy transfer has been shown to occur from poly(ethylene terephthalate) (PET) units to the 2,6‐naphthalenedicarboxylate (2,6‐ND) monomer units in a series of poly(ethylene terephthalate– co –2,6‐naphthalenedicarboxylate) (PET–2,6‐ND) copolymers, as filament yarns, by an exchange mechanism at…
Theory of angle-resolved photoemission from the bulk bands of solids. III. Effects of intra-atomic and interatomic electron-phonon interactions
In this third paper of a series, the influence of phonons upon the angle-resolved spectra of electrons photoemitted from the bulk bands of solids is considered. When a tight-binding formalism is used to describe the electronic states of solids, it is possible to divide the electron-phonon interaction into terms that m…
Investigation of the dielectric constants and the diamagnetic anisotropies of cyanobiphenyls (CB), cyanophenylcyclohexanes (PCH), and cyanocyclohexylcyclohexanes (CCH) in the nematic phase
We have measured the dielectric constants of cyanobiphenyls (CB), cyanophenylcyclohexanes (PCH), and cyanocyclohexylcyclohexanes (CCH) using a capacitance bridge with a dielectric cell having a guard ring. The ratio Δχ/Δε was also measured for these materials using a new technique which is applicable when Δχ is small…
Intrinsic surface phonons in amorphous silica
We have detected intrinsic surface phonons in amorphous silica by performing Raman scattering and infrared-reflectivity measurements on samples of porous Vycor glass. Qualitative agreement of our experimental spectra with theoretical calculations provides an identification of the surface features in terms of microscop…
Effect of the White Noise on Electrohydrodynamic Transitions in Nematics
The effect of the white noise on the hydrodynamic transitions is studied in the nematic MBBA. The values of both transition points to the laminar flow and to the turbulent flow increase with the amplitude of the white noise. Brief discussion is described.
Specific Heat near the Nematic-Smectic-ATricritical Point
Specific-heat measurements near the nematic-smectic-$A$ transitions of the octyloxy, nonyloxy, and decyloxy members of the 4-$n$-pentyl-phenylthiol-4\ensuremath{'}-alkoxybenzoate ($\overline{n}\mathrm{S}5$) homologous series reveal the presence of critical-tricritical crossover behavior upon increasing $\overline{n}$,…
Mechanics of the extension of cotton fibers. II. Theoretical modeling
Abstract A preliminary analysis of deconvolution of a nylon model is given. This is then developed to give the available deconvolution strain in cotton. The total extension is then given by adding the fibrillar strain and is compared with experimental values of breaking extension. The relation between convolution exte…
Phase Diagram and Electrical Properties of Cu2-δTe
The phase diagram of Cu 2-δ Te (δ<0.22, T <400°C) is constructed with the help of the galvanic cell Cu|CuBr|Cu 2-δ Te|C, showing that it includes as large as 10 phases in the range concerned. This diagram has been justified by DTA measurements. The electronic conductivity and ionic one are also measured.
Magnetization Measurements and55Mn NMR Studies of LaNi0.5Mn0.5O3
Magnetization measurements and 55 Mn NMR study of a system with the nominal formula LaNi 1- x Mn x O 3 (0.0 ≤ x ≤0.5) were made. It was found that materials with 0.03 ≤ x ≤0.5 are mixtures of a Pauli paramagnet LaNiO 3 and a ferromagnet LaNi 0.5 Mn 0.5 O 3 . The Curie temperature of LaNi 0.5 Mn 0.5 O 3 was found to be…
Surface spectroscopy studies of the SrTiO3(100) surface and the platinum-SrTiO3(100) interface
Auger-electron spectroscopy (AES), low-energy-electron diffraction (LEED), electron-energy-loss spectroscopy (ELS), and ultraviolet-photoelectron spectroscopy (UPS) were used to characterize the composition, structure, and electronic properties of the strontium-titanate (100) surface and the platinum---strontium-titan…
Mie theory calculations: new progress, with emphasis on particle sizing
New progress in Mie theory calculations is reported. A computer program is available using the Lentz algorithm allowing more extensive calculations, namely, studying of bigger diameters and more important absorption coefficients. Emphasis on particle sizing is considered.
Carbon interaction with nickel surfaces: Monolayer formation and structural stability
A first order phase transition occurs at Ni (111) surfaces under conditions of controlled chemical potential. For a dilute Ni–C alloy of fixed bulk composition an abrupt change occurs (as temperature is lowered) in the surface carbon coverage from a very low coverage state to a two dimensional crystalline C overlayer.…
Pair potentials for fcc metals
Long-range pair potentials are presented for the fcc metals Ni, Au, Ag, Pt, Pd, Cu, and Al. Experimental data considered in deriving the potentials include the sublimination energies and stacking-fault energies as well as the lattice parameters, elastic constants, and vacancy-formation and -migration energies. A volum…
EXAFS in niobium diselenide intercalated with rubidium
EXAFS has been measured at the Nb K-edge in the layered compounds NbSe 2 and at the Nb and Rb K-edges in the same crystal after intercalation with the alkali metal. Changes in bond length were measured to an accuracy of 0.004 AA. These changes were compared with changes in lattice parameters observed by X-ray diffract…
Study of As2(Se,Te)3glasses by X-ray absorption and photoelectron spectroscopy
Arsenic selenide-telluride glasses have been investigated by X-ray absorption and photoelectron spectroscopy. The core electron energy shifts and chemical shifts in K-absorption edge measurements associated with the glass-crystal transitions of pure As 2 Se 3 and As 2 Te 3 have been studied. The effect of composition…
Solid-State Photoelectron Spectroscopy with Synchrotron Radiation
Synchrotron radiation sources, providing intense, tunable, polarized, and stable beams of ultraviolet and x-ray photons, are having a great impact on biology, physics, chemistry, materials science, and other areas of research. Synchrotron radiation has revolutionized solid-state photoelectron spectroscopy by enhancing…
Mechanical and thermodynamic constraints on fluid distribution in partial melts
In this paper we examine the mechanical and thermodynamic criteria which are necessary for equilibrium to exist in partial melts that are subject to hydrostatic stress. Existing theory satisfactorily demonstrates (1) that crystal‐liquid interfaces will have no sharp edges and will approach constant curvature and (2) t…
An evaluation method of electrical fire hazard caused by tracking breakdown
Degraded insulators of electronic components tend to ignite even when electrical energy supplied to them is less than 50 watts. This is also the case when the insulators are made of self extingushing polymeric materials. To evaluate the degradation of insulators, causes for the variation of data are investigated prima…