Crystal Growth from High Temperature Solutions
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Relation between the singlet-triplet splitting and the copper-oxygen-copper bridge angle in hydroxo-bridged copper dimers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelation between the singlet-triplet splitting and the copper-oxygen-copper bridge angle in hydroxo-bridged copper dimersVan H. Crawford, H. Wayne. Richardson, John R. Wasson, Derek J. Hodgson, and William E. HatfieldCite this: Inorg. Chem. 1976, 15, 9, 2107–2110Publication…
New figure of merit for transparent conductors
A figure of merit for transparent electrode materials has been defined by φTC=T10/Rs, where T is the optical transmission and Rs is the electrical sheet resistance. Expressions are derived to predict the transparent electrode properties of a material from its fundamental electrical and optical constants. The performan…
The Gas-phase Nitration of Alkanes
The principal chemical and kinetic results obtained for this reaction are reported and discussed critically. A brief description is given of its industrial application to the manufacture of nitroalkanes. The detailed mechanism suggested during recent years for the nitration of alkanes by nitrogen dioxide is discussed…
Acoustic-Phonon Softening in the Invar AlloyFe3Pt
Inelastic neutron scattering experiments on an ordered Invar alloy ${\mathrm{Fe}}_{3}$Pt show large softening of the [100]TA and [110]T${\mathrm{A}}_{1}$ acoustic shear modes below the Curie temperature. In addition, a central peak is observed below 100 K, which, however, behaves noncritically. The phonon softening is…
The dielectric coupling of low-energy excitations in vitreous silica to electromagnetic waves
Measurements of the variation of the dielectric constant with temperature at 11 GHz and between 0.4 and 14K have shown that the coupling between electromagnetic waves and the low-energy excitations present in vitreous silica strongly depends on the concentration of OH - ions. This result can be explained by an increas…
Etude des propriétés viscoélastiques de quelques mélanges polybutène‐1 – polypropène
Abstract Die viskoelastischen Eigenschaften von Mischungen aus Polybuten‐1 und Polypropen werden im β‐Relaxationsgebiet untersucht. Es gibt nur einen Relaxationspeak, und die Mischungen scheinen in der amorphen Phase verträglich zu sein. Diese Beobachtungen bestätigen die von uns bereits früher aufgestellten Hypothese…
Evidence for more than one C2+ion transport mechanism in mitochondria
The active transport and internal binding of the Ca2+ analogue Mn2+ by rat liver mitochondria were monitored with electron paramagnetic resonance. The binding of transported Mn2+ depended strongly on internal pH over the range 7.7-8.9. Gradients of free Mn2+ were compared with K+ gradients measured on valinomycin-trea…
Calculating the effect of high temperatures on the onset voltages of negative discharges
A method is proposed for calculating the effect of high temperatures on the negative-corona onset voltages in air. This method is based on the formulation of the physical processes of the negative discharge to be self-maintained at high temperatures. The results computed by this method agree quite well with those meas…
The phase problem
Abstract The paper discusses the use of the theory of entire functions for solving the phase problem. In all practical cases only three forms of logarithmic Hilbert transform could possibly be required. The paper defines them and analyses their applicability. A generating form is also put forward for cases of possible…
Electron diffraction study of inter- and intrapolytypic phase transitions in transition metal dichalcogenides. III. Complementary diffraction studies and lattice imaging of the deformation waves
Detailed electron diffraction results are given on the inter- and intrapolytypic phase transitions in tantalum disulfide and interpreted in terms of the transformation mechanisms involved. The orientation and spacing anomalies observed in the diffraction patterns are related to the incommensurate phases which are typi…
X Ray Observation of2kFand4kFScatterings in Tetrathiafulvalene-Tetracyanoquinodimethane (TTF-TCNQ)
X-ray-scattering measurements on TTF-TCNQ (tetrathiafulvalene-tetracyanoquinodimethane) above 54 K clearly reveal a new one-dimensional scattering at the wave vector $(0.59\ifmmode\pm\else\textpm\fi{}0.02){b}^{*}$ interpreted as $4{k}_{\mathrm{F}}$ scattering and attributed to an additional phonon anomaly which also c…
Direct estimation of stacking fault energy by thermodynamic analysis
An attempt is made to calculate the stacking fault energy by a thermodynamic analysis. It is shown that the stacking fault energy is equal to the difference in bulk free energies between f.c.c. and h.c.p. phases in non-magnetic metals. On the other hand, the magnetic surface energy contribution to the stacking fault e…
Bulk-hardened Sm-Co-Cu-Fe 2:17 magnets
Sm(C00.87Cu0.13)z alloys were prepared with 7.2⩽z<8. Homogenization heat treatment yielded single-phase 2:17 material for z≳7.2. For z=7.8 some of the Co was substituted by Fe. Homogenized alloys remained single phase for up to 15% Co substituted. Remanence values BR up to 12.1 kG were reached. Coercive fields…
Theory of the screening of impurity ions in semiconductors with spatially-variable dielectric constants
In this paper, Dingle's theory of the screening of impurity ions in semiconductors is generalized. This is accomplished by inserting in the theory of screening the spatial dielectric function of the medium. Poisson's equation for the potential of an impurity ion follows from one of Maxwell's equations. With the analyt…
Spatial carrier density modulation effects in metallic conductivity
Lattice defects in a metal modify the conduction-band carrier density at the defect site. Thus transport, past the scattering caused by thermal lattice vibrations, becomes easier (or harder) in the region of changed carrier density. The resulting transport field inhomogeneities have been discussed in earlier work on e…
Intrinsic decay lengths of quasimonochromatic phonons in a glass below 1 K
The temperature dependence and magnitudes of the reciprocal decay length ${l}^{\ensuremath{-}1}$ of low-intensity longitudinal and transverse phonon pulses propagating in fused silica glass between 0.02 and 0.5 K for frequencies near 0.5 GHz are reported. The temperature dependence of ${l}^{\ensuremath{-}1}$ is in goo…
Surface photoeffect for metals
A nonlocal theory for the surface photoeffect produced in metals by vacuum ultraviolet radiation is presented. Using a simple electron-gas model, it is shown that $p$-polarized incident light generates, in the surface region, a strongly spatially dependent vector potential having longitudinal character; it is argued t…
Electronic levels in surface space charge layers on Si(100)
The energy-level spacings for electrons and holes in surface-charge layers on Si(100) are determined from a measurement of direct optical absorption of far-infrared laser radiation guided along the surface. At photon energies in the range 5.64-15.81 meV, the separation of the electric subbands is measured as a functio…
Coexistence of two charge-density waves of different symmetry in4Hb−TaSe2
The physical properties of $4Hb\ensuremath{-}\mathrm{Ta}{\mathrm{Se}}_{2}$ suggest the development of two charge-density waves (CDWs) of different symmetry. Electron and neutron diffraction studies establish that layers with octahedral and trigonal prismatic (TP) coordination undergo independent transitions to CDW sta…