Materials Literature
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The transient optical absorption and luminescence induced by irradiation of amorphous SiO 2 with an electron pulse have been measured. It is found that the transient optical absorption spectra do not depend on impurities and have a strong peak at 5.3 eV and a satellite peak at 4.2 eV. The peak energy of the luminescen…
We describe a novel technique for the fabrication of electro-optic (EO) waveguides in integrated optic device structures employing organic EO materials. The technique combines the poling and waveguide formation steps by utilizing patterned poling electrodes and the induced birefringence associated with the poling proc…
The temperature dependence of the inelastic neutron-scattering intensity from vitreous silica has been studied between 50 and 300 K down to frequencies of 150 GHz. Above 500 GHz one finds essentially harmonic behavior. Low-frequency anharmonic behavior can be described by a relaxational model using parameters determin…
Room-temperature vibronic pulsed laser action in trivalent chromium-activated forsterite (Cr3+:Mg2SiO4) is reported for the first time. The free-running laser emission is centered at 1235 nm of the broad 4T2→4A2 fluorescence band, and has a bandwidth of ∼22 nm.
ABSTRACT In this paper a mathematical model simulating the kinetics of silica dissolution and hydroxyl ion consumption in a typical alkaline flooding environment is developed. The model is based on the premise that dissolution occurs via hydrolysis of active sites through the formation of an intermediate complex, whic…
Abstract The new austenitic alloy N08367 (AL-6XN®) was developed as an extension of the familiar N08366 (AL-6X™) alloy which has been in service primarily as condenser tubing in seawater-cooled heat exchangers for times approaching 15 years. There are close to 9 million meters (30 million feet) of thin-walled condense…
Abstract Microbial induced corrosion (MIC) relevant to nuclear power plant systems is reviewed. The long construction times associated with nuclear plants and the large number of redundant or standby systems where water is allowed to remain stagnant for long periods of time produce conditions under which MIC can occur…
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…