Materials Literature
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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…
Glycerol inhibits the in vitro self-association of monomeric collagen into fibrils and induces the dissociation of fibrils preassembled from NaBH4-reduced collagen. These effects were investigated in an effort to understand the mechanism of fibril assembly of the protein. In PS buffer (0.03 M NaPi and 0.1 M NaCl, pH 7…
Mineralization of bone matrix may be influenced by the presence of specific, noncollagenous bone proteins. The quantitative influence of two bone-specific proteins--bone gamma-carboxyglutamic acid (Gla) protein and osteonectin--and other proteins that decreased the rate of crystal growth was measured by adding seed cr…
The density-functional theory of freezing is extended to investigate the crystallization of binary hard-sphere mixtures. As the ratio of diameters $\ensuremath{\alpha}=\frac{{\ensuremath{\alpha}}_{1}}{{\ensuremath{\alpha}}_{2}}$ is lowered, the fluid-solid phase diagram for disordered alloys evolves from a spindle sha…
The red luminescence band that occurs in brown diamonds, where the yellow luminescence band originated at 2.721 eV is also present, is excited by light of 450-550 nm, corresponding to an absorption band present in these diamonds. It is a very structured band, up to 12 zero-phonon lines being identified in a 114 meV in…
The density functional theory is applied to the freezing of the hard-sphere fluid into a dense-random-packed glass configuration. It is shown that the relative thermodynamic stability of the fluid, glass and crystal phases is completely determined by only two structural features: the number of nearest neighbours and t…
Optical properties of thin liquid crystal cells are found to deviate significantly from those of thick cells. Results on the liquid crystal thickness dependent phase retardation, effective birefringence, and decay time of thin E-7 cells are presented. A simple model which is based on the partially disordered surface l…
Several theoretical concepts such as two-phonon bound states, off-center ions, and Fermi resonances have been suggested to explain the strong anomalies in the phonon spectra of copper halides, with no conclusive results. We take into account the anharmonic coupling of the $TO(\ensuremath{\Gamma})$ phonons with the two…
Depth profiles of the magnetization of sputtered films of Fe3O4 and its oxidized form, γ-Fe2O3, were obtained by the new polarized neutron reflection technique. We find that the magnetization of Fe3O4 is constant throughout the thickness (2600 Å) of the film except for a surface region about 25 Å deep corresponding to…
<div class="htmlview paragraph">Major plastics material utilisation in motor vehicle applications has been concentrated in relatively non-critical performance areas. These areas particularly interior trim parts are now almost saturated offering scope only for interplastic substitution.</div> <div class=…
The authors determine the self-inductance of a non-ferromagnetic metallic ring (of order 10 -8 H) to an accuracy of about 10%. The method is based on measuring the phase difference between induced EMF and induced current in the ring when the ring is exposed to an alternating magnetic flux. Both the theory and measurem…