Materials Literature
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The current response was measured in ${\mathrm{K}}_{0.3}$Mo${\mathrm{O}}_{3}$ in the highly conducting state after the switching at low temperatures, both in time domain and in frequency domain. Clear evidence was found which shows that the switching or the strong nonlinear conduction in this temperature range is due…
The electrical dc resistivity of variously prepared polymer--conducting-carbon-black composites has been studied over a wide temperature range (4.2--300 K). For the different composites, the resistivity follows a ln\ensuremath{\rho}\ensuremath{\sim}${T}^{\mathrm{\ensuremath{-}}\ensuremath{\alpha}}$ law over the whole…
Optical absorption coefficient, dark conductivity, and photoconductivity properties of amorphous GaSe thin films are reported. The dependence of the absorption coefficient α on the photon energy ℏω at the edge of the absorption band is well described by the relation αℏω=B(ℏω−Eopt)2 with an optical gap Eopt of 1.50–1.5…
M\"ossbauer electric field gradients, Raman vibrational modes, and crystallization temperatures exhibit threshold behavior near the composition x=0.20 in binary ${\mathrm{Si}}_{\mathrm{x}}$${\mathrm{Te}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$ glasses. This threshold is evidence of a morphological structural change that…
The skeleton--side-group interaction due to \ensuremath{\sigma}-\ensuremath{\pi} mixing in organopolysilane ---(SiXY${)}_{n}$--- where X and Y are methyl (Me) and phenyl (\ensuremath{\Phi}) groups, has been theoretically investigated. The results are discussed on the basis of uv photoemission experiments. The \ensurem…
We report detailed photoinduced and doping-induced absorption spectra of poly(3-methylthienylene) (P3MT) in the infrared-frequency range. The four infrared-active translational (T) modes of bipolarons and the weak-ring (R) modes associated with the ring deformation were observed, as in polythiophene (PT). Detailed ana…
The system PVME/d-PS has been investigated by neutron small angle scattering. By extrapolating the critical scattering, the spinodal was determined and used to calculate the Flory–Huggins parameter χ(φ,T) in the frame of mean field theory. Separating the Gibbs potential of mixing ΔG in a Flory–Huggins term χ(φ,T) and…
The amorphous to crystalline transition in the semiconductor GaSb has been studied as a recording mechanism for write-once optical storage. Amorphous as-deposited films, 100 nm thick, are transformed locally to the crystalline state by a focused laser beam. This recording process can be accomplished within 10 ns. The…
We have studied the influence of the growth direction and the solidification speed on crystal quality of the silicon-on-insulator (SOI) film by laser recrystallization. In a 〈100〉 direction on a {100} Si substrate, lateral epitaxial growth of single-crystal regions from a seed extended as much as 1 mm. It was found th…
Magnetic properties of stoichiometric and off-stoichiometric NbFe 2 intermetallic compounds have been studied. It has been revealed that the stoichiometric NbFe 2 shows strongly enhanced Pauli paramagnetic properties. The temperature dependence of its susceptibility in a weak external field shows a maximum as observed…
We present a simple phenomenological model for glasses which fits both the thermal conductivity \ensuremath{\kappa} and the specific heat C up to roughly 100 K. This includes the plateau in \ensuremath{\kappa} as well as the maximum in C/${T}^{3}$ which occur between 3--10 K. In addition to conventional tunneling syst…
In poly(3-methylthiophene), P3MT, charge is stored in spinless bipolarons at all but the most dilute doping levels. From the combination of magnetic and electrochemical measurements, we find definitive evidence of the reversed spin-charge relation expected for bipolarons with ${N}_{s}$/${N}_{\mathrm{ch}{<10}^{\math…
The pressure effect on the magnetic transition temperatures of Mn 3 GaC, Mn 3 ZnC and Mn 3 SnC were measured under pressures up to 13 kbar. The pressure derivatives of the transition temperatures are obtained to be d T t /d P =-3.5 K/kbar and d T C /d P =0.4 K/kbar for Mn 3 GaC, d T t /d P =-0.9 K/kbar and T C /d P =0…
Smetic and nematic liquid-crystal materials can be homogeneously aligned by buffed thin films of appropriate polymers. We propose that the buffing process orients the polymer’s molecular chains in a manner similar to cold drawing of bulk polymer samples. Experimental verification of this theory is obtained by measurin…
An asymptotic method for analysing steady corona discharges is described. Formulae are obtained for curves of current versus voltage for the discharge between coaxial concentric and accentric cylinders.
The electronic energy levels of polyaniline (PANi) thin films have been investigated using UV/VIS/NIR spectroscopy and X-ray photo-electron spectroscopy. The experimental results have been compared with the latest theoretical band structure calculations for the polyemeraldine salt form of PANi, and also the various st…
Molecular structure-preparation condition relationships are reported for electrochemically prepared polypyrrole-toluene sulphonate electrically conducting films. Polypyrrole films have been prepared from aqueous solutions employing a range of anodic potentials (0.5-1.6 V versus SCE) and at several temperatures. Consis…
Absolute total scattering cross sections have been measured for electron scattering from krypton in the energy range 0.175-20 eV. The measurements have been performed with a linear time of flight electron transmission spectrometer. Comparisons are made with the results of a number of other experiments and theoretical…
The thermal conductivity of the amorphous alloy Fe 40 Ni 40 P 14 B 6 is investigated with the aim to separate out the lattice contribution and to compare it with that of amorphous dielectrics. The problems of the influence of the radiative transfer of heat between the sample and its environment, which causes errors in…
Conjugated polymers such as polyacetylene form a group of model semiconductors in which the 'one-dimensional' character of the polymer strongly modifies the behaviour of charges added to the chains from that usually observed in three-dimensionally bonded semiconductors. First, the polymer chain can undergo local reorg…