Materials Literature
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The wavelength-modulated absorption and reflection spectra of SrTi${\mathrm{O}}_{3}$ have been measured as functions of temperature. Over a 60-K temperature range around the structural phase transition the band gaps of both high- and low-temperature phases are observed simultaneously. This effect and an associated ban…
The mechanism of deformation of the ordered CuAu alloy is investigated using electron microscopy. The alloy deformation is shown to be accomplished by slipping; a larger degree of deformation involves the mechanism of twinning. The interaction between dislocations and the boundaries of 90° -disoriented domains has bee…
The influence of the partial substitution of Cr for Fe in BaFe12O19 on the intrinsic coercive force has been investigated. The specimens BaFe12−xCrxO19 (x = 0 to 3.0) were prepared by the ordinary powder method. The intrinsic coercive force iHc, saturation magnetization Is, and anisotropy constant K, at room temperatu…
The dielectric constants of NaClNaBr, KClKBr, RbClRbBr, KClRbCl, and KIRbI mixed ionic crystals were measured by the “immersion method” at 1 MHz as a function of concentration. Their variations with the mole fraction were represented by convex curves. A semi-empirical equation for calculating the dielectric const…
Photoelectron energy-distribution curves of Pt at photon energies $6.8\ensuremath{\le}\ensuremath{\hbar}\ensuremath{\omega}\ensuremath{\le}11.6$ eV exhibit structure originating from initial states 3.6, 2.5, 1.5, and between 0.7 and 0.2 eV below ${E}_{F}$. A strong peak at - 0.2 eV observed for $\ensuremath{\hbar}\ens…
The photodissociation of N2O involving electronically excited metastable fragments has been investigated at wavelengths ≳ 1050 Å by photofragment translational energy spectroscopy. Irradiation was carried out with light pulses of a few microseconds duration, and fragment energies were measured by means of the time-of-…
This paper reports determinations of collisional deactivation rate constants for O2(1Δg) by minor atmospheric constituents and other gases. The benzene–oxygen photochemical system was used to produce O2(1Δg), and relative concentrations were measured by monitoring the intensity of its emission at 1.27 μ. The rate cons…
The Raman spectra of single crystal KClO3 were measured in the region above 30 cm−1 at 298 and 77°K. Single crystal infrared spectra in the internal mode region were measured by reflection at 298°K. Infrared spectra of the polycrystalline material also were measured at 77°K. Assignments for all of the crystal vibratio…
The characteristics of cation diffusion and ionic conductivity in solid electrolytes are discussed using β- and β″-alumina as examples. The problem is characterized by a cation migration by the vacancy mechanism in a “cation-disordered phase,” a system in which the number of available vacant sites is of the same order…
In this paper we derive from first principles, equations describing the kinetics of luminescent transfer. We apply the Pauli equation to an appropriately defined density matrix to derive, under one formalism but under opposite limiting assumptions, both the usual nonlinear kinetic rate equations and the equations whic…
A model is proposed for electrohydrodynamic alignment effects in cholesteric liquid crystals. We derive and discuss a formula for the threshold voltage of such alignment, starting from the planar texture between two conducting plates. An improved formula for the threshold of the dielectric deformation of this orientat…
X-ray induced electron-emission measurements were used to determine the energy levels of core electrons in ZnO, ZnS, ZnSe, ZnTe, CdO, CdS, CdSe, CdTe, HgS, HgSe, and HgTe. The investigated energy range extends from the bottom of the valence band to about 1200 eV below the Fermi level. Chemical shifts were determined b…
The Raman spectrum of trigonal tellurium has been obtained at 295 and 90 \ifmmode^\circ\else\textdegree\fi{}K. The Raman-active ${A}_{1}$ singlet and two $E$ doublets are identified by the scattering polarization selection rules, and the $E$-mode LO-TO splittings and linear wave-vector shifts are observed. The natural…
The statistics for an arbitrary distribution of traps under nonequilibrium steady-state conditions is derived, and it is seen to be identical in form to the Shockley-Read expression for a single trapping level. The energy dependence of the statistics has been investigated, and several interesting features have been de…
Infrared-reflectivity measurements on InSb surfaces having inscribed line gratings yield the first complete dispersion relation for surface plasmons.Received 10 May 1971DOI:https://doi.org/10.1103/PhysRevLett.27.95©1971 American Physical Society
We have carried out uv photoemission measurements on hexagonal ZnO cleaved in vacuum. The results of this study have placed the $\mathrm{Zn} 3d$ core level at 7.5 \ifmmode\pm\else\textpm\fi{} 0.2 eV below the valence-band maximum, some 3 eV lower than predicted by R\"ossler's Green's-function (Korringa-Kohn-Rostoker)…
The ferroelectric phase of K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ and the antiferroelectric phase of N${\mathrm{H}}_{4}$${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ vanish at hydrostatic pressures >17 and 33 kbar, respectively. The results are qualitatively discussed in terms of the coupled proton-lattice model developed…
9, 10-Anthraquiuone (AQ) in an inert aliphatic solvent emits luminescence at room temperature. The emission consists of (1) solution phosphorescence and (2) delayed thermal fluorescence (DTF). We found that similar emission is observed for some AQ and naphthoquinone (NQ) derivatives. The singlet–triplet separation, Δ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPore-size distributions of copper oxide-alumina catalystsKen. Nobe, Muchlas. Hamidy, and Chieh. ChuCite this: J. Chem. Eng. Data 1971, 16, 3, 327–331Publication Date (Print):July 1, 1971Publication History Published online1 May 2002Published inissue 1 July 1971https://pubs.a…
Abstract A white clay from the Jatoba talc mine, Castro, Paraná, Brazil, is shown by chemical analysis, X-ray and electron diffraction, and by thermal analysis to be essentially pure antigorite in the strict sense of the term. Single crystal electron diffraction patterns give various values for the long a parameter, w…