Materials Literature
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Most previous articles on microbiologically influenced corrosion (MIC) failures describe individual failures but do not compare them. This study compares three factors, microstructure of welds, ferrite content and sensitization. Twelve austenitic stainless steel welds with reported pitting corrosion were examined. Ele…
It is suggested that the ``supermodulus effect'' observed for composition-modulated superlattices arises from the presence of the structurally disordered solid interfaces and not necessarily from electronic structure effects.
The crystal structure of (CH 3 ) 4 NNO 3 at 303 K is tetragonal (D 4h 7 (P4/nmm)) with Z=2 and the nitrate ions are disordered. Differential scanning calorimetry data revealed the phase sequence. The Raman and infrared spectra (10-5000 cm -1 ) of single crystals and polycrystalline samples of (CH 3 ) 4 NNO 3 were inve…
The additive coloration of potassium halide powders is reported. The optimum coloration temperature decreases with decreasing particle size. The stability of coloration was profoundly reduced in the powders in comparison with that in single crystals. The reduced stability of coloration is interpreted as due to the int…
Several transition metal compounds show a transition from the low-spin (LS) to the high-spin (HS) electronic state with increasing temperature. The cooperative nature of the transition is usually parametrised by an interaction constant Gamma , the origin of which is still under discussion. In the frame of the lattice…
Vibrational absorption spectra in the infrared, and vibronic absorption and luminescence bands in the visible and ultraviolet spectral regions have been studied for synthetic diamonds grown using 99% 13 C. This is the first such study of any semiconductor for which the isotope of the host material has been totally cha…
Laser emission is reported in an Er+3-doped ZrF4-based fluoride glass often referred to as ‘heavy metal fluoride glass’ (HMFG). The laser operates at room temperature at a wavelength of 2.78μm. The glass is a standard ZBLAN formulation in which all of the LaF3 (4 mol%) is replaced by ErF3. Glass preparation, spectrosc…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Marcelo Trivi and Hector J. Rabal, "Stereoscopic uses of diffraction gratings," Appl. Opt. 27, 1007-1009 (1988) Export Citation BibTex Endnote (RIS) HT…
The specific heat C p of hexagonal barium titanate has been measured over a wide temperature range from 50 K to 300 K. The C p curve shows a typical second-order-type anomaly at T 0 =222.7 K; the transition enthalpy Δ H , transition entropy Δ S and specific heat jump Δ C p at T 0 are estimated to be 2.2×10 2 J/mol, 1.…
Microwave conductivity and dielectric constant at 6.5 GHz are reported for three tetramethyltetrathiafulvalene salts: (TMTTF${)}_{2}$X, X=SCN, ${\mathrm{ReO}}_{4}$, and ${\mathrm{SbF}}_{6}$. A divergence of the dielectric constant \ensuremath{\epsilon} is observed at the structureless transition temperature for ${\mat…
We propose a density-functional method for calculating elastic moduli of crystalline solids. The method is based on the second-order Ramakrishnan-Yussouff (RY) expansion of the variational grand-canonical potential around a uniform liquid state. The densities of the strained and unstrained crystal are represented as s…
In an earlier paper, we introduced the concepts of phonon-assisted and impurity-assisted hopping processes to explain the c-axis resistivity in graphite intercalation compounds (GIC's). A different theory was proposed by Shimamura. Both theories provide a qualitative explanation for the observed behaviors in low-stage…
Nuclear spin-lattice relaxation by paramagnetic impurities in insulating crystals is expected in conventional theory to be frozen out in the millikelvin temperature region owing to the freezing of the electron-spin orientation into the lowest-energy spin state in the presence of a static field. Experimental relaxation…
The average asymmetry of two-, four-, and five-dimensional linear and ring polymers, with and without excluded volume, is investigated numerically via Brownian dynamics. It is found that the average asymmetry of nonexcluded volume chains is in good agreement with theoretical predictions in all dimensions studied. The…
Liquid-phase epitaxial growth onto a Si(100) substrate is studied using molecular-dynamics simulations. The material is described using two- and three-body interaction potentials which provide a realistic description of crystalline silicon and of the crystal-melt interface. After preparation at solid-melt coexistence,…
The dynamical structure factor of the solution of rod-like polymers is calculated by using a newly proposed kinetic equation. The initial decay rate of the structure factor is obtained as a power series of the scattering vector k. It is found that (i) the coefficient of k2, which gives the cooperative diffusion consta…
(Te 6 4+ )(Se 8 2+ )(AsF 6 − ) 6 (SO 2 ) cristallise dans le systeme triclinique avec le groupe d'espace P1. Affinement de la structure jusqu'a 0,063
We suggest the possibility that staging transitions, similar to those in graphite intercalation compounds, might occur in a strong magnetic field for high-quality modulation-doped multiple-quantum-well systems with sufficiently low carrier density, \ensuremath{\rho}\ifmmode\bar\else\textasciimacron\fi{}, and sufficien…
X-ray photoelectron spectroscopy (XPS) and tight-binding calculations are used to study the electronic structure and the local order in ${\mathrm{Ge}}_{\mathrm{x}}$${\mathrm{Se}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$ glasses (0<x<0.42). The shape of the valence electronic density of states in Ge-Se compounds is…
Molecular-dynamics simulations are employed in studies of liquid-phase epitaxial growth onto a Si(111) surface. The material is described using two- and three-body interaction potentials which provide a realistic description of crystalline silicon and of the crystal-melt interface. From equilibrium solid-melt coexiste…