Materials Literature
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The quadratic response formalism is used to derive a general expression for the Auger electron current in the limit of high energies of both photo- and Auger electrons. The Auger decay of the initial core hole is treated to all orders in the decay rate. General formulas for the first and second moments of the Auger sp…
Paraphenylene oligomers (biphenyl, p-terphenyl, p-quaterphenyl, p-quinquephenyl, p-sexiphenyl) form electrically conducting complexes with AsF5. Prolonged exposure to AsF5 causes a polymerization of these p-phenylene oligomers to give highly conducting charge-transfer complexes of poly(p-phenylene). Conductivities as…
The optical transition 2 F 7/2 → 2 F 5/2 of Yb 3+ in the antiferromagnet YbCrO 3 has been studied. The exchange splittings for the ground and excited Kramers doublets were observed in the antiferromagnetic state. From the analysis of the splitting of the ground Kramers doublet as a function of applied magnetic field,…
Infrared absorption spectra are reported for matrix isolated (CuCl)n, (CuBr)n, (AgCl)n, (AgBr)n and for mixed clusters with composition CunClmBrn–m. Silver halide clusters with n=1 to 3 are already present in the vapor in equilibrium with the melt. The monomer and dimer forms of the copper halides could be produced on…
We report the polarized Raman spectra, the infrared reflectivity, and the infrared dielectric constant of vitreous ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$, for vibrational frequencies up to 1800 ${\mathrm{cm}}^{\ensuremath{-}1}$. Longitudinal- and transverse-mode frequencies are identified. The dominant Raman line, at 80…
High-pressure resistivity measurements on mixed-valence TmSe indicate a new electronic phase transition near 30 kbar at liquid-helium temperature. In the paramagnetic phase, the $\ensuremath{\rho}\ensuremath{-}T$ curve shows unexpectedly small pressure dependence, in contrast with the predictions of a simple valence-c…
The low-temperature tunneling levels observed in glasses are discussed in terms of the free-volume model. As the system falls out of thermodynamic equilibrium near its glass transition temperature ${T}_{g}$, liquid clusters are frozen in. This Letter proposes that voids are formed within the liquid clusters as they in…
A major part of the giant Raman scattering by adsorbed molecules on a Ag-island film is shown to be due to the large increase in the electric field at the molecules and to the large electric dipole moment of the molecule-metal-island complex that result from the excitation of the transverse collective electron resonan…
The low-temperature thermal conductivity of lithium nitride (Li 3 N) shows a temperature dependence which is typical for a good dielectric crystal with K(T) varies as T 3 below about 1.5K. Its absolute value, however, is about 2.6 times smaller than expected. A quantitative analysis shows that this extra phonon scatte…
The authors have derived a rotationally invariant kinetic exchange interaction between strongly correlated electrons in a doubly degenerate narrow band with arbitrary band filling. The results are expressed in terms of the global operators characterising the spin and the orbital dynamics. The effective Hamiltonian pro…
The variation of viscosity with temperature has been determined over a wide range of temperature for a Muong Nong tektite material. The viscosity at the liquidus temperature of 1320°C is about 2×10 4 P. Crystallization heat treatments in the range of temperature between 900° and 1300°C does not produce significant cry…
An experimental study of electrostatically stabilized disclination walls is reported in the two-dimensional director field of freely suspended ferroelectric smectic-$C$ films. This Letter presents measurements of the dependence of the wall width on applied field and the collapse rate of walls forming closed circular l…
The initial burst and the diffusion of fission produced Xe were investigated on UC2 irradiated to thermal neutron doses between 2.1 x l014 and 1.3 x 1016 fission/cm8. In heating-runs with 5 and 10°C/min and below 1,000°C, the burst revealed three steps at around 200, 400 and 600°C (in 5°C/min heating run), to which ac…
Article Redetermination of the structure of anhydrous zinc metaborate Zn4O(BO2 )6 was published on October 1, 1980 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 151, issue 1-4).
Abstract Alternating copolymers containing 4,4‐isopropylidene‐bisphenol (BPA) and comonomers with various degrees of polarity have been evaluated to find comonomer structures which provide low melt viscosity and good thermal stability. The materials were prepared by pyridine‐catalyzed nucleophilic displacement reactio…
Thermally stimulated discharge (TSD) of polymers has become a widely used experimental technique for the investigation of various material parameters, such as charge storage properties,1surface voltage stability,2–3determination of the mean depth of the internal charge,4activation energies5of traps and the trap struct…
Abstract The electrical resistivity of the 5,6: 11,12-bis(epidithio)naphthacene-bromine system (TTT–Brn) was examined over the composition range from n=0.3 to 2.0 using polycrystalline compactions. The room-temperature resistivity shows a minimum of about 7 Ω cm near n=0.5, suggesting the formation of a mixed-valence…
Methods of test for measuring the resistance of plastics to environmental stress cracking are critically reviewed. Particularly consideration is given to the relative merits of constant strain and constant stress tests and the most suitable procedure for the generation of design data discussed. Note is taken of the po…
Klebelsbergite is an antimony sulfate found at Felscibdnia, Hungary, and recently at Pereta, Tuscany, Italy. Crystal data are: a: 5.766(2), b: 11.274(2), c : 14.887(DA; space group Pca2r; Z: 4. The atomic positions were determined by direct methods and refined by leastsquares calculations to an R index of 0.045 for I…
An explicit equation for the glass transition temperature (Tg) of compatible polymer-diluent mixtures is derived from a comparison of classical and statistical thermodynamic relations of the excess entropy. The ratio of Tg for plasticized/unpiasticized systems is related to the ratio of configurational partition funct…