Materials Literature
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We present the results of Monte Carlo simulations of jump rates for diffusion (\ensuremath{\Gamma}) in a Lennard-Jones solid under an externally applied nonhydrostatic stress. The particular diffusion event considered is the interchange of a vacancy and an atom. The associated hopping time is calculated within transit…
[Mn(C 3 H 4 N 2 ) 6 ](ClO 4 ) 2 cristallise dans le systeme rhomboedrique avec le groupe d'espace P3. [MnCl 2 (C 3 H 4 N 2 ) 4 ] cristallise dans le systeme monoclinique avec le groupe d'espace C2/c. Affinement de la structure jusqu'a 0,050 et 0,036 respectivement
Defect clusters in semiconductors may cause persistent photoconductivity. A model is developed based on the spatial separation of the photogenerated carriers by the local potential barriers of the clusters. The buildup and decay of the defect-cluster-induced persistent photoconductivity depend on the geometry of the c…
Les deux composes du titre cristallisent dans le systeme orthorhombique avec le groupe d'espace Pnma. Affinement de la structure jusqu'a 0,020 pour les deux composes. Les anions sont des octaedres deformes
Magnetization measurement, 55 Mn NMR and 1 H NMR measurements were performed in hydrides of pseudobinary intermetallics Y(Mn 1- x T x ) 2 (T=Al, Co and Ni); x =0∼0.15). The magnetization measurement indicates that Y(Mn 1- x T x ) 2 H y with y ≦3.5 exhibit ferromagnetism with Mn moments ranging from 0.07 to 0.32 µ B an…
The luminescence properties of Cs2 NaGdCl6 are reported. In the emission, as well as the excitation spectra of the Gd3+ luminescence, vibronic lines are present due to coupling with the ν3 , ν4, and ν6 vibrational modes of the GdCl3−6 octahedron. The magnetic–dipole character of the zero-phonon transitions is confirme…
The resonance and the relaxational dielectric dispersions of KH 2 PO 4 found in the ferroelectric phase were examined for ordinary and lossy specimens. The magnitudes of these two dispersions decreased markedly with crystal defects as well as with a d.c. bias field. A universal relation between the free dielectric con…
Commensurate-incommensurate (C-IC) phase transition of Rb 2 ZnCl 4 is studied by low temperature transmission electron microscopy. Nucleation and disappearance of pairs of “dislocations” composed of six discommensurations (DCs) and their motions along the c plane play an important role in the transition prcccess. Duri…
The characteristics of luminescence observed during the initiation of an electrical tree have been studied for polyethylene subjected to high electrical stresses. Use of a light detection system which is at least three orders-of-magnitude more sensitive than conventional partial discharge detectors shows that luminesc…
Radiation-enhanced diffusion of Cu and Au tracer impurity atoms during ${\mathrm{Kr}}^{+}$ irradiation has been measured in amorphous ${\mathrm{Ni}}_{50}$${\mathrm{Zr}}_{50}$ and ${\mathrm{Ni}}_{35}$${\mathrm{Zr}}_{65}$ alloys in the range 80-573 K. At low temperatures, the spreading of the thin impurity layers was du…
Gem-quality diamonds have been grown with 13C contents up to 89 at. %. First- and second-order Raman spectra of these crystals indicate that the second-order Raman lines reported for natural diamonds are, indeed, due to carbon lattice modes and not some impurity. Also, the equivalent of a sharp line at 2667 cm−1 in na…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface analysis: x-ray photoelectron spectroscopy and Auger electron spectroscopyNoel H. TurnerCite this: Anal. Chem. 1988, 60, 12, 377–387Publication Date (Print):June 15, 1988Publication History Published online1 May 2002Published inissue 15 June 1988https://pubs.acs.org/…
Electric polarization of magnetite, induced by rotating magnetic field in the triclinic b c plane, was measured along the triclinic a axis below 60 K where magnetite is ferrimagnetic as well as ferroelectric. The magnetoelectric polarization was influenced by the way of application of mechanical stress onto the single…
Infrared reflectivity spectra of sintered crystal CdCr2S4 have been measured in the temperature range of 15–300 K. The frequencies of transverse and longitudinal phonon modes were determined from the spectra with the Kramers–Kronig relation. The temperature dependencies of those showed anomalously large shifts near th…
The intensities of vibrational resonance hyper-Raman transitions are developed in the usual framework of vibronic theory. In analogy to linear Raman scattering, the leading terms of RHR scattering, A, B, and C, are found when the electronic transitions moments, appearing in the transition hyperpolarizability, are expa…
The values of the optical constants of magnesium fluoride (MgF(2)) and zinc sulfide (ZnS) thin films are obtained using a classical oscillator model and the experimental values of their spectral transmittance. Auger electron spectroscopy was performed on the samples to determine the chemical composition of the films.…
Two approaches to the growth of high-quality epitaxial Ge epilayers on (100) Si have been investigated. The first consisted of compositional-grading Si1−xGex layers and the use of strained-layer superlattices as dislocation filters. In general, this method produced unsatisfactory results, due to the difficulty in achi…
The optical properties of extremely small isolated semiconductors provide a sensitive probe of the developing electronic structure in the materials. Cadmium sulfide and ${\mathrm{CdS}}_{\mathrm{x}}$${\mathrm{Se}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$ crystallites are precipitated in an insulating glass matrix during a…
A new band-structure method which allows the self-consistent solution of the Schr\"odinger equation with a full (all-electron, non-muffin-tin) crystal potential has been developed. A basis set consisting of the 9 (16) s, p, and d (f) linear-muffin-tin orbitals per site is used. The wave functions as well as the electr…
Many liquids have heat capacities that substantially exceed those of the corresponding crystal, and this discrepancy magnifies in the supercooled regime. Thus, liquid entropy declines more rapidly with temperature than does crystal entropy, and the former paradoxically seems to fall below the latter for temperatures b…