Materials Literature
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The changes of the vibrational amplitudes of molecules in a crystal lattice, due to interaction between the optically induced dipoles, are shown to account for the nonlinear refractive index of a crystal. The general expressions for the fourth- and sixth-rank tensors, ${\ensuremath{\chi}}_{\mathrm{ijkl}}(\ensuremath{-…
Elastic scattering cross sections of electrons by O 2 were measured by a cross-beam method at incident energies between 200 and 500 eV and at scattering angles, θ, from 4° to 150°. The relative cross sections at 500 eV were normalized to the absolute ones measured by Bromberg at 2–40°. The absolute values at 200–400 e…
The fluorescence, Raman, and fluorescence excitation spectra of diphenyloctatetraene and diphenylhexatriene condensed on rough silver are reported. The fluorescence excitation spectra reveal that on silver the normally dipole-forbidden 1Ag←X 1Ag absorption takes place in addition to the allowed 1Bu←X 1Ag process. This…
Angle-resolved and angle-integrated ultraviolet-photoemission-spectroscopy (UPS) investigations have been carried out over the entire concentration range $0<x<1$ of the sodium-tungsten-bronze system ${\mathrm{Na}}_{x}\mathrm{W}{\mathrm{O}}_{3}$. The results indicate that the rigid-band model used by several auth…
We present a simple model of staging in graphite intercalation compounds. Unlike previous theoretical studies, finite-$T$ calculations based on our model yield the staged structures which are observed experimentally. Certain choices of model parameters result in more complex structures such as those predicted recently…
Mg(0001) has been studied with angle-resolved photoemission spectroscopy for photon energies in the range 7.0-26.8 eV. The polar-angle dependence of the photoelectron emission was recorded along the two symmetry lines $\overline{\ensuremath{\Gamma}}\overline{M}$ and $\overline{\ensuremath{\Gamma}}\overline{K}$ of the…
To cancel the average bulk macroscopic field compensating charge should be induced on the polar surface of compound crystals. In this paper we clarify the mechanism of the charge compensation by performing the DV-X α calculations on the clusters M 13 X 13 representing the polar surface of the rock-salt type crystals.…
High field magnetization and transverse magnetoresistance of itinerant electron helical magnet MnSi are investigated at temperatures between 4.2 K and 77 K in pulsed field H 0 up to 500 kOe. Large high field susceptibility and negative magnetoresistance are obtained reflecting a large spin fluctuation in this compound…
The first-order Raman spectrum of crystalline Ce${\mathrm{O}}_{2}$ was measured at various temperatures from 300 to 850 K. On the other hand, the linewidth was calculated quantitatively theoretically with consideration of only the cubic anharmonic term of the Coulomb and repulsive parts in the crystal potential energy…
The space group of the antiferroelectric phase of lead zirconate is determined to be Pbam by conventional and convergent beam electron diffraction (CBED). The coordinates of the oxygen atoms are determined by fitting the computed intensities of 2 k 1, 3 k 1 and 4 k 1 reflections to the experimental ones obtained from…
The first stage of the room-temperature $F$-center coloring in europium-doped KCl has been investigated as a function of the impurity concentration as well as of the aggregation-precipitation state of the europium ions in the crystal with the use of optical-absorption, photoluminescence, electron-paramagnetic-resonanc…
Unpolarized and magnetic-field-induced circularly polarized luminescence spectra are reported for Eu3+ doped into the cubic Cs2NaYCl6 host. These spectra were obtained at high resolution under variable temperature conditions, and they span the 5DJ(J = 0–3)→7FJ(J = 0–5) transition regions of Eu3+. A detailed analysis o…
The thermal conductivity of polycrystalline, cubic CuCl has been measured from 100 to 480 K and pressures from 0.5 to 2.7 GPa by a transient hot-wire technique. The heat transport is produced by phonons. The absolute value of the conductivity is low and becomes nearly temperature independent at high temperatures where…
By studying the tetrathiafulvalene-chloranil (TTF-CA) complex the different of electron---molecular-vibration ($e$-mv) interactions in the Raman and infrared spectra of mixed-and segregated-stack one-dimensional compounds are compared and interpreted. In mixed-stack crystals, besides the well-known infrared effects, t…
The optical transmission and indices of refraction for the cubic isomorph of ZrO(2) stabilized with 12.0-mol % Y(2)O(3) were measured at various temperatures and for a range of wavelengths from 0.36 to 5.1 microm. Index data to +/-5 x 10(-5) were fitted to a three-term Sellmeier equation. The value of N(D) = 2.15847.…
The variation of the resistivity with thickness d and bulk electron mean free path lambda infinity of thin metal films with unlike surfaces is calculated using Soffer's angularly dependent surface scattering model (1967). Tabular values for the resistivity enhancement due to a range of surface roughness combinations a…
A spectroscopic survey of a large number of natural brown and yellow diamonds shows that the H3 centre (a vacancy plus an A-aggregate of nitrogen) is observed in absorption quite frequently in brown diamonds and occasionally in yellow samples. The H4 centre (a vacancy plus a B-aggregate of nitrogen) occurs much less f…
Abstract The copolymerizations of 4(5)‐vinyl‐1,2,3‐triazole, 1‐ p ‐bromophenyl‐4‐vinyl‐1,2,3‐triazole and 2‐methyl‐5‐vinyltetrazole with styrene, methyl methacrylate and vinyl acetate have been examined and the corresponding copolymerization parameters r 1 , r 2 were evaluated. The reactivities Q of these monomers are…
The temperature dependences of the mean square fluctuation of the displacement of the lattice ions and of the local spectral density at the lattice ions sites in KH 2 PO 4 have been evaluated as a function of the ratio between the correlation length xi and the range of the proton-lattice ion interactions. A comparison…
Uniaxial compression of plates of brittle materials containing pre‐existing planar cracks oriented at certain angles with respect to the direction of overall compression has revealed that the relative frictional sliding of the faces of the pre‐existing cracks may produce, at their tips, tension cracks which deviate at…