Materials Literature
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The wavelength modulation spectrum of Cu is presented at 7\ifmmode^\circ\else\textdegree\fi{}K in the range of $2.0<~\ensuremath{\hbar}\ensuremath{\omega}<~6.0$ eV. The band structure of Cu calculated by the empirical pseudopotential method is used to compute the imaginary part of the dielectric function ${\ensu…
Ni-Br, Ni-Cl, Mn-Cl, and Zn-Cl boracites have been studied with electron and polarization microscopy. Among others 180° head-head or tail-tail domains are found in the orthorhombic phase of Ni-Br, Ni-Cl, Mn-Cl, and Zn-Cl boracite. They may be due to growth stacking faults on {100} planes. The orientations of strain-fr…
The possible physical nature of charge carrier traps of quasi-continuous distribution in molecular crystals is discussed. It is shown that the formation of quasi-continuous trap distribution may be connected with the statistical dispersion of the charge carrier polarization energy caused by fluctuational structural ir…
The phase diagram of the RbCl–NaCl system has been measured by the method of cooling curves. By combining these data with available thermochemical data for the system, the integral molar excess free energy of mixing at 800 °C has been calculated as ΔG E = −632X RbCl X NaCl cal/mole; and the integral molar excess entro…
The longitudinal magnetostriction of group-VIII transition metals and alloys was measured with a capacitance dilatometer at 4.2 \ifmmode^\circ\else\textdegree\fi{}K in fields up to 100 kOe. The resultant values of the logarithmic volume dependence of the magnetic susceptibility, $\frac{\ensuremath{\partial}\mathrm{ln}…
The theory of the singular readjustment of a conduction band to a hole formed in an x-ray absorption event is extended to the case where the hole has finite mass, as in the $d$ band of Cu. Although the resulting recoil removes the singularity, the effect may still be quite large, and results in an electron-induced Deb…
The hole mobility in Cu 2 O was measured using guard ring and Hall current techniques over a temperature range of +200 to −125 °C. For samples with highest mobility the temperature dependence was found to be approximately exponential with different activation energy above and below +60 °C. The results are explained on…
The thermal analyses of copper basic oxysalts of the type Cu 2 (OH) 2 XO y , where X = S, C, Cl, Br, I, N, HC and y = 4, 3, or 2 reveal that decomposition occurs, in most cases, by dehydroxylation with concomitant disproportionation of the oxysalt. An outstanding exception to this pattern of decomposition is the basic…
A relaxation method is developed which permits a direct measurement of O2(b1Σg+) quenching rate constants. An Al wire spiral is used to selectively quench O2(1Σ) which is normally present in discharged oxygen as a steady-state intermediate. The characteristic time for the reestablishment of the O2(1Σ) steady state is…
The thermal conductivities of single crystals of silicon and of calcium fluoride have been measured in the temperature range 3-40 \ifmmode^\circ\else\textdegree\fi{}K and 2.5-30 \ifmmode^\circ\else\textdegree\fi{}K, respectively. For samples in the form of square cross-section rods, the conductivity in the boundary sc…
The following two equations are proposed for the temperature dependence of the elastic stiffness constants: ${c}_{\mathrm{ij}}={c}_{\mathrm{ij}}^{0}\ensuremath{-}\frac{s}{({e}^{\frac{t}{T}}\ensuremath{-}1)}$ and ${c}_{\mathrm{ij}}=a\ensuremath{-}\frac{b{T}^{2}}{(T+c)}$, where ${c}_{\mathrm{ij}}^{0}$, $s$, $t$, $a$, $b…
Abstract Photoelectron spectra of the halides of B, C, N, P, As, S, Se, Te and U are reported and interpreted in terms of molecular orbital structure. The experimental criteria which are used to identify the orbitals are briefly discussed. It is shown how the orbitals of the halides of the elements of different groups…
The negative magnetoresistance in ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$ crystals at 77\ifmmode^\circ\else\textdegree\fi{}K was found to saturate at about 9 kG and to increase with increasing electric field. The magnetoresistance data are explained in terms of spin disorder scattering. In the presence of a magnetic fie…
The absorption of SrTi${\mathrm{O}}_{3}$ below the fundamental edge shows, near liquid-nitrogen temperature, an oscillatory behavior, for which an explanation is proposed in terms of indirect transitions ${\ensuremath{\Gamma}}_{15}\ensuremath{\rightarrow}{X}_{3}$, centered around 3.27 eV and involving a 51-meV LO phon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModified Ney-Armistead Cell for Gas Diffusion MeasurementsArvo Lannus and E. D. GrossmannCite this: Ind. Eng. Chem. Fundamen. 1970, 9, 4, 655–657Publication Date (Print):November 1, 1970Publication History Published online1 May 2002Published inissue 1 November 1970https://do…
Creep-rupture properties for C-129Y (Nb–10% W–10% Hf–0.1% Y) to 1000 h are presented at 980°, 1095°, and 1205°C. Improvements in strength at 980° and 1205°C can be achieved by pretest annealing at higher temperatures. These improvements are achieved only at the expense of a significant loss in ductility.
Lattice dynamics has progressed a long way since Born and Huang's book was originally published in 1954.A paperback version, scarcely differing from the first edition, is now available.Though there is no discussion of neutron and X-ray scattering, and though the experimental information on elastic, thermodynamic and o…
Abstract The time optimal control problem for jacket cooled continuous flow stirred tank reactor (CSTR) with an exothermic, irreversible, second‐order, homogeneous, liquid‐phase reaction (the saponification of ethyl acetate) was solved with the maximum principle and phase plane analysis. Both experimental studies and…
Abstract Anhand von mehr als 100 Literaturhinweisen zeichnet der Verfasser die Entwicklungen seit der Aufstellung der Tammannschen Zunderformel im Jahre 1920. In diesem Zusammenhang werden die reaktionsbestimmenden Vorgänge erörtert, die den Ablauf der Reaktion nach einem parabolischen Zeitgesetz bedingen, so z. B. Di…
Abstract The differential and integral cross sections for the elastic and inelastic scattering of electrons by atoms are discussed. The differential scattering cross section describes the angular distribution of the scattered electrons while the integral cross section is a measure of the fraction of the incoming elect…