Materials Literature
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Magnetic crystalline anisotropy of Pd 1- x Fe x (\(0.1{\lesssim}x{\lesssim}0.3\)) in cubic phase was studied by torque method. An abrupt change was found in the composition dependence of anisotropy constant K 1 at 4.2 K around x =0.17: from +17×10 4 erg/cm 3 for x =0.16 to -6×10 4 erg/cm 3 for x =0.18. Values of K 1 f…
Current oscillations or ``narrow-band noise'' peaks associated with nonlinear charge-density wave conduction in ${\mathrm{NbSe}}_{3}$ are studied in the presence of a thermal gradient. Multiple splitting of the spectral noise peaks are observed for both Peierls transitions, suggesting the formation of velocity-coheren…
The isotropic Raman spectra of the ν1 (A′1) mode of NO−3 ions are measured in molten LiNO3–RbNO3 mixtures at various concentrations and at temperatures from 478 to 750 K. The isotropic Raman bandwidth Γiso is found to increase almost linearly with the mole fraction c(Li+) of LiNO3, from 9–13 cm−1 for molten RbNO3 to 2…
Three different spherical-shaped models of the amorphous alloy ${\mathrm{Ge}}_{0.20}$${\mathrm{As}}_{0.40}$${\mathrm{Se}}_{0.40}$ , obtained from quenching of the molten mixture of the elements, were constructed. The models were built by computer simulation of an x-ray diffraction experiment. Initial models were creat…
Interface excitons caused by stacking faults in BiI 3 , crystals have been investigated on absorption, photoluminescence and its excitation spectra. Characteristic three sharp absorption lines (called R , S and T ), appear close to the fundamental absorption edge. The temperature dependence of the line shape shows a t…
Numerical calculations of the conductances of specific two-dimensional networks of conductors whose values are described by a variety of distributions have been carried out. The results are found to differ only slightly from a well-known estimate which predicts that the conductance G of such a network to be given by t…
We have studied the glass transition in vitreous silica using the technique of high-temperature light scattering. We report the temperature dependence of the Landau-Placzek ratio of Homosil up to and through the glass transition. The results show that the compressibility \ensuremath{\beta} of silica increases sharply…
Angle-resolved ultraviolet photoemission spectroscopy measurements have been made from the (0001) and (112\ifmmode\bar\else\textasciimacron\fi{}0) surfaces of magnesium in the photon energy range of 15 to 115 eV. Both bulk and surface features are identified. The occupied bands along the [0001] direction are character…
An analytical solution is given for the contrast from an individual pointlike defect in the cathodoluminescence mode of a scanning electron microscope. This solution takes into account the influence of recombination at the surface and the internal optical absorption. The cathodoluminescence contrast is shown to differ…
Computations have been carried out to determine how the magnitude and shape of the polymer and salt induced (psi)-type CD spectra depend on the structural properties of a collection of randomly oriented large chiral aggregates. Uniaxial polarizable groups located at the cubic lattice points have been used to model the…
Raman scattering measurements are used to investigate the lattice-dynamic properties of ${\mathrm{Cd}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Zn}}_{\mathrm{x}}$Te. The samples were thin films grown by molecular-beam epitaxy on GaAs substrates. The first-order Raman spectra for the ternary samples show two sets…
We report the results of an experimental survey determining the contributing factors for Raman spectral activity of molecules adsorbed on metal surfaces. The systems investigated are benzene, pyrazine, and s-triazine physically adsorbed onto the (111) and (110) faces of single crystal silver. We consider the relative…
Using an iterative solution to the Onsager integral equation for the orientational distribution function of spherocylinders in the nematic liquid crystal phase, we have studied several aspects of the Onsager theory of nematic ordering. We find that the isotropic–nematic coexistence region becomes narrower as the ionic…
The Cr 3+ -oxygen-vacancy pair center, Cr 3+ –V 0 , in WO 3 recently observed with EPR by Hirose and Kawaminami is analyzed using the Müller-Berlinger superposition model for Cr 3+ as a basis. The large near-axial, ground-state splittings of 2.4 and 2.8 cm -1 at 300 K are accounted for by displacements of 0.12 to 0.18…
Le compose Zr 21 Re 25 a une structure rhomboedrique de groupe d'espace R3c, affinee jusqu'a 6,8%. Cette structure est caracterisee par de larges segments de type MgZn 2
The Rietveld profile-analysis method is used to investigate the x-ray diffraction pattern of lithiated Fe3O4. It is shown that, after exposure to air, pure magnetite coexists with a lithium-inserted LixFe3O4 phase. The Mössbauer spectra at 300 and 4.2 K have been used to estimate the lithium content of the sample, the…
The sound attenuation coefficient of magnetic fluid under an external magnetic field varies with the angle φ between the field and the sound propagation. We attribute the cause of this anisotropy to the two motions of the clusters of the ferrous colloidal particles in the fluid. One is the rotational motion of them, w…
A transmission electron microscopy study of sintered Nd-Fe-B magnets after annealing above 650 °C shows the formation of a thin intergranular Nd-rich layer extending to pockets of polycrystalline fcc Nd crystals. The grain boundary phase acts as a pinning site for the magnetic domain walls and is necessary for good ma…
In a preceding paper, we have described the polyicosahedral structure of small argon clusters containing less than about 50 atoms which were produced in a free jet expansion. Going on with this study, we describe presently the multilayer icosahedral structure of larger argon clusters containing up to about 750 atoms,…
The authors have discovered multipoles of even order to about 10 in the multipole moments characterising angular distributions of convoy electrons ejected by swift ions during penetration of thin solids. They suggest the strongly transverse distributions observed reflect electron loss from excited n, l states inside t…