Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of electron exchange and single-file diffusion on charge propagation in Nafion films containing redox couplesDaniel A. Buttry and Fred C. AnsonCite this: J. Am. Chem. Soc. 1983, 105, 4, 685–689Publication Date (Print):February 1, 1983Publication History Published onl…
The size of a cation is important in determining its site preference. In oxide spinels containing 2 (super +) and 3+) ions (2-3 spinels) there is a tendency for the larger ion to prefer the tetrahedral site; the reverse holds for 2-4 spinels. A set of cation radii optimized to best fit spinel lattice parameters is pre…
A simple definition of random close packing of hard spheres is presented, and the consequences of this definition are explored. According to this definition, random close packing occurs at the minimum packing fraction $\ensuremath{\eta}$ for which the median nearest-neighbor radius equals the diameter of the spheres.…
Measurements of the frequency dependence of the microscopic second-order nonlinear electronic susceptibility are reported for the organic system $p$-nitroaniline. The results are suitably described in terms of a theoretical microscopic mechanism involving highly charge-correlated electron states dominating the second-…
The structural and lattice dynamical aspects of the incommensurate phase transition in ThBr 4 (T c =95K) are studied by means of elastic and inelastic neutron scattering. Above T c the temperature-dependent softening of a low-lying optic mode of wavevector q s approximately=0.3 c* is observed. The combined analysis of…
Evidence for superconductivity in ${(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{E})}_{4}$${(\mathrm{R}\mathrm{e}{\mathrm{O}}_{4})}_{2}$ [where BEDT-TTF is bis (ethylenedithiolo)tetrathiafulvalene] near 2 K for pressures above 4 kbar is reported. This is the first unambiguous obse…
The Mossbauer spectrum of dilute 57 Fe 2+ in MgCO 3 shows a well resolved magnetic hyperfine pattern at 4.2K due to a very slow rate of electronic spin relaxation. Above 60K only pure quadrupole splitting is obtained as a result of very fast spin-lattice relaxation rate. The spin-lattice relaxation behaviour of Fe 2+…
The apparent suppression of plasmon satellites in core-level photoemission at low electron kinetic energy is studied. The process of photoemission is studied in the Golden Rule formulation, and the final-state wavefunction corresponding to the photoemitted electron leaving a plasmon excited in the solid is found using…
57 Fe Mossbauer spectroscopy is used to investigate the low-temperature behaviours of alpha -MnS and MnSe, and the results are successfully interpreted in terms of a crystal field model. In alpha -MnS there are at least two magnetic spin arrangements. At 131K<T<T N the spins are along a cubic (110) direction, whereas…
The DC G(T) has been measured in the approximate range 4-320K for crystalline samples of the series Ti n O 2n-1 with 4<or=n<or=9. This includes the first results reported for n=7, 8 and 9. The G(T) for n=4, 5 and 6 show qualitative differences from the behaviours reported previously, including extra transitions at 127…
Measurements of transient magnetic birefringence are reported for isotropic solutions of a biological rodlike macromolecule, bacterial virus fd. A steep increase of the birefringence and a slowing down of the relaxation process are observed just below the concentration at which the liquid-crystalline phase appears. Th…
High-resolution phase diagrams of four binary liquid-crystal mixtures exhibiting nematic, smectic-A, smectic-C multicritical points are found to be universal.Received 23 September 1982DOI:https://doi.org/10.1103/PhysRevLett.50.178©1983 American Physical Society
A resolution to the controversy over the magnitude of the effective short-range Coulomb interaction in molecular conductors is proposed by showing that it depends very strongly on band filling because of intermolecular correlations.
M-C calculations based on the Fröhlich-theory of electron–LO-phonon scattering are used to determine energy losses and attenuation lengths of excited electrons with initial energies E0 < Eg ≈ ≈ 9 eV within the conduction band of SiO2. The attenuation length depending on an electric field F can be described by λa(F) =…
The temperature dependence of the impedance at frequencies between 100 Hz and 5 MHz and of the dc resistance of SrTiO3 and BaTiO3 single crystals are investigated in the temperature range between 300 and 1300 K. An anomalous behaviour of the capacitance can be explained phenom-enologically as due to the combined effec…
The electron mobilities associated with the transverse-optical (TO) mode are discussed in the perovskite oxide ferroelectric semiconductors. In this scattering model the instability of the TO mode is taken into account, so that the spontaneous polarization and the soft mode produce an important effect on the electron…
We show in this paper that, notwithstanding the isotropic nature of Miedema's semi-empirical theory for the heat of formation $\ensuremath{\Delta}H$ of intermetallic phases, and contrary to the present view in literature, the parameters ${\ensuremath{\Phi}}^{*}$ and ${n}_{\mathrm{WS}}$ used to predict the signs of $\e…
The electrical resistivity of three exfoliated graphites (Grafoil, Foam, and Union Carbide UCAR-ZYX) has been measured in the temperature range 1.5-300 K. While the resistivity measured across the rolling plane, ${\ensuremath{\rho}}_{\ensuremath{\perp}}$, is comparable to the $c$-axis resistivity of highly oriented py…
The thermodynamic stability, the dielectric, diamagnetic, and elastic properties of mixtures of polar as well as those of nonpolar nematic liquid crystals were investigated and compared to the properties of their components. Small deviations from the ideal behavior were observed and attributed to differences in the pa…
Procedures are presented for the accurate calculation of the total energy of a solid within the framework of the local-density approximation. The starting point is a self-consistent band calculation using a basis of localized orbitals. The method is applied to study the total energy of metallic lithium as a function o…