Materials Literature
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Abstract It has been studied the intrinsic viscosity ratios of cellulose solutions in different solvents and of the corresponding nitrates dissolved in aceton using cellulose samples from different origins and with different degrees of polymerization. The results demonstrate that with FeTNa and CdEn as solvents, molec…
The adsorption of nitric oxide and its dissociation on the Ru(001) surface have been studied through the vibrational energies of the adsorbed layer. The inelastic electron scattering measurements show that two distinct states of molecular NO are adsorbed at 130 K. The dissociation of a bridged NO is complete at 316 K,…
The dielectric constant and conductivity of VO2 single crystals are measured in the frequency range 30 to 105 Hz and in the temperature range 77 to 250 K. Measurements are also made at 300 K in the frequency range 15 × 103 to 2 × 106 Hz. It is shown that the dielectric behaviour over these ranges is described by a Deb…
Inelastic-electron-tunneling spectroscopy on Al-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$-Pb tunneling junctions at 4.2 K has been used to study electronic transitions in the energy regime between 0.5 and 2.5 eV. $\ensuremath{\pi}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{*}$ singlet-triplet ($S\ensuremath{\rightarrow}T$…
The thermoelectric power and the transverse Nernst-Ettingshausen coefficient of cadmium arsenide (${\mathrm{Cd}}_{3}$${\mathrm{As}}_{2}$) at room temperature have been calculated as a function of electron concentration, taking into account the HgTe-type inverted electronic-energy-band structure of this material. In th…
Quantum oscillations in the magnetoresistance and susceptibility of $2H$-Ta${\mathrm{S}}_{2}$ have been used to determine Fermi-surface cross sections. Eleven frequencies in the range from 0.04 to 6.44 MG have been observed corresponding to sections arising from the charge-density-wave transition at 75 K. Comparison t…
Phase transformation studies on pure Na 2 SO 4 revealed four phases only; phase IV was not observed.Electrical conductivity measurements have been made on polycrystalline undoped and K-doped Na 2 SO 4 and on single crystals of undoped Na 2 SO 4 . Kinetic measurements on II → III transformation in undoped Na 2 SO 4 sho…
The specific heats ${C}_{p}(T)$ of CuCl, CuBr, and CuI were measured by the adiabatic calorimetric technique. The corresponding Debye temperature for each crystal is given and a comparison between the results is drawn. The room-temperature phonon dispersion relations for these cystals are fitted by a nine-parameter sh…
Frequency shifts of two species of Raman-active modes in layered hexagonal boron nitride have been measured in the pressure range from 1 bar to 110 kbar at room temperature. From the observed shifts it was found that, while the increase of an intralayer force constant of the crystal was only six percent, the interlaye…
Extensive experimental studies of the OH stretching region of the Raman spectra of polycrystalline ice Ih and low density amorphous solid water (H2O (as)) are reported. Analysis of these spectra, using insights from theoretical calculations, leads to the following conclusions: (i) The overall span and distribution of…
We have studied interactions between a domain wall and phonons in a one-dimensional-model system of a structurally unstable lattice with a double-well local potential and nearest-neighbor coupling. We find that a nonlinear effect in the interacting phonon amplitudes gives rise to a Brownian-like motion of isolated dom…
The steady-state solution of the nonlinear heat-conduction equation when the thermal conductivity is strongly temperature dependent is expressed (for arbitrary geometry and heat source) in terms of the corresponding solution for the linear heat-conduction case. This permits a closed-form expression for the maximum tem…
The intensities of plasmon-loss satellites of core lines and the valence band in x-ray-photoemission spectra (XPS), as well as of Auger lines of A1 are determined by convoluting the no-loss spectra with an asymmetric Lorentzian line shape. Intrinsic processes contribute 25% of the total plasmon intensity of XPS core l…
A polarization-modulation ellipsometric technique was used to make direct measurements of the optical dielectric constants of single-crystal specimens of the nonstoichiometric tungsten-bronze compound ${\mathrm{Na}}_{x}\mathrm{W}{\mathrm{O}}_{3}$ ($0.52<x<0.94$) and W${\mathrm{O}}_{3}$, in the energy range from…
Dynamical calculations of the intensities of normally-incident low-energy electrons diffracted from $\mathrm{ZnO}(10\overline{1}0)$, performed using an "exact" matrix-inversion method, are compared both with earlier calculations based on the renormalized-forward-scattering (RFS) method and with measured intensities. T…
The transmission spectra in the intramolecular stretching region have been measured for thin films of H2O and D2O polycrystalline ice Ih and amorphous solid water. The data have been reduced to obtain the complex refractive index in this region via an iterative procedure designed to account for reflection and interfer…
Thermal conductivity measurements have been performed in nematic and smectic liquid crystalline phases by the forced Rayleigh light-scattering technique. Results show clearly that the thermal transport anisotropy is governed by the molecular shape anisotropy and by the molecular orientation but is independent of the s…
The wastage effects of a sodium-water reaction resulting from a small leak in a liquid-metal fast breeder reactor steam generator were investigated. These experiments were conducted at low steam injection rates, ranging from 0.07 to 13.8 g/s, with the following test conditions: sodium temperature 480°C, sodium velocit…
Small disks of molybdenum were irradiated in the Oak Ridge Research Reactor to a fast-neutron fluence of about 1 × 1021 neutrons cm−2, at temperatures between 220 and 900°C. The defect structure in the neutron-irradiated specimens as determined by transmission electron microscopy (TEM) consisted of both dislocation lo…
Abstract The addition of lithium chloride to solutions of poly(5,5′‐bibenzimidazole‐2,2′‐diyl‐1,3‐phenylene) (PBI) and N,N‐dimethylacetamide (DMAC) resulted in the elongation of the PBI molecule in solution. This elongation is due to the association of lithium and/or chloride ions in the region of the nitrogen atoms o…