Materials Literature
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The intensities of photoluminescence lines D1 through D4 and also of the background component that are characteristic in a dislocated silicon crystal are measured as a function of the temperature. All of them become weaker as the temperature is raised. Such behaviour is interpreted in a quantitative way with the model…
We report the first observation of a pressure-induced phase transition in LiI${\mathrm{O}}_{3}$. A new phase appears when $\ensuremath{\beta}\ensuremath{-}\mathrm{Li}\mathrm{I}{\mathrm{O}}_{3}$ is compressed hydrostatically at room temperature, beyond 50 kbar. This is a reversible first-order transition with negligibl…
The thermal conductivity of an anharmonic crystal containing randomly distributed substitutional defects due to impurity-phonon scattering is theoretically investigated with the use of the method of double-time thermal Green's functions and the Kubo formalism considering all the terms, i.e., diagonal, nondiagonal, cub…
Polycrystalline ${\mathrm{H}}_{2}$S${\mathrm{O}}_{4}$ and ${\mathrm{H}}_{2}$Se${\mathrm{O}}_{4}$ were studied by powder neutron-diffraction techniques at temperatures near the melting points and at 10 K. This work was undertaken to determine hydrogen positions and to search for order-disorder transitions in the hydrog…
The kinetics of hydrogen absorption by polycrystalline α-zirconium metals has been investigated by the use of spherical specimens in the pressure range 2×10−5–1×101 Pa and in the temperature range 673–1073 K. The experimental results are reasonably explained on the basis of the model in which the process is assumed to…
$n$-type, ${10}^{13}$ and 2 \ifmmode\times\else\texttimes\fi{} ${10}^{15}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ doped germanium has been irradiated with \ensuremath{\sim} 1-MeV electrons at liquid-helium and room temperatures. With the use of transient-capacitance spectroscopy, six electron traps and one hole trap were o…
We have studied steady-state heat flow in a two-dimensional crystal by the method of molecular dynamics. The model system contains 1000 particles on a triangular lattice interacting via the Lennard-Jones potential. The system is 50 unit cells long and 10 unit cells wide. We find that the thermal conductivity $\ensurem…
The steady-state velocity of a planar liquid-solid interface is predicted by calculating the free energy dissipated by irreversible processes at the interface and equating it to the available driving free energy. A solute drag term and an intrinsic interfacial mobility term are included in the dissipation calculations…
We present experimental determinations of the cross section for photoionization for $4d$ and $5d$ valence states in transition and noble metals and at the interfaces that these metals form with elemental semiconductors (group IV) in the photon-energy range $h\ensuremath{\nu}=70\ensuremath{-}200$ eV. A description of t…
In strict analogy with the case of silicon, the Hall-coefficient factor of holes in natural diamond is found to be systematically less than unity in the range of temperature $100<T<1000$ K investigated here. A microscopic interpretation is shown to provide information on the reliability of a different set of inv…
A dynamic bond percolation model is defined and studied. The model is intended to describe diffusion of small particles (ions, electrons) in a medium which is statistically disordered (as in ordinary bond percolation), but which is also undergoing dynamic rearrangement processes on a timescale short compared to the ob…
The first-order Raman spectra of vitreous Si${\mathrm{O}}_{2}$ have been studied as a function of sample fictive temperature ${T}_{F}$ for $900\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}\ensuremath{\le}{T}_{F}\ensuremath{\le}1550\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$. Three observations were made: (1) The br…
The interaction of Ti${\mathrm{O}}_{2}$(110) with ${\mathrm{O}}_{2}$, ${\mathrm{H}}_{2}$, CO, and C${\mathrm{O}}_{2}$ was studied by means of low-energy electron diffraction, x-ray photoelectron spectroscopy, electron energy-loss spectroscopy, thermal desorption, electron paramagnetic resonance, and measurements of ch…
The trap distribution analysis of CaSO 4 :Dy has been carried out using a fractional-glow technique. It shows that the TL process in CaSO 4 :Dy involves quasi-continuous distribution of traps with activation energies ranging from 1.15 to 2.39 eV in the 340-370K glow-temperature range. The trap spectrum of CaSO 4 :Dy r…
A method of obtaining polymeric materials showing high anisotropy of electrical conductivity (up to 10 8 ) is reported. Electrical properties of polycarbonate films doped with TTT-TCNQ crystalline CT complex obtained using this method are discussed.
A stochastic mixture model is proposed for the dielectric formed by the powder of an isotropic polycrystalline material included in an embedding medium of air or a non-polar substance. The relevant expression of the complex dielectric constant of the mixture is obtained in terms of the dielectric parameters of the mix…
The salt bridge between Lys-13 (epsilon-NH3+) and Leu-129 (alpha-COO-) in lysozyme was converted to an amide bond by 1-ethyl-3-[3-(dimethylamino)propyl]carbodiimide hydrochloride (EDC) reaction in the presence of imidazole (0.3-1 M) at pH 5 and room temperature, followed by dialysis at pH 10. Absence of imidazole unde…
<div class="htmlview paragraph">In this paper the strength of material based on the stressing in rolling contact is described. The investigations result in a guideline according to which the case depth of slewing bearing rings can be determined, if the load on the rolling elements, their size, and the number of…
The static critical behaviour at the normal to incommensurate phase transition in Rb2ZnCl4 has been investigated by means of diffuse X-ray scattering. The measured values of the critical exponents gamma and nu are in good agreement with theoretical estimates for the d=3XY model. Measurements of the diffuse scattering…
The critical opalescence of a binary polymer mixture consisting of polyvinyl methyl ether and deuterated polystyrene was measured by small-angle neutron scattering. In accordance with a mean-field treatment, it was found that the critical exponents $\ensuremath{\nu}$ and $\ensuremath{\gamma}$ are 0.5 and 1, respective…