Materials Literature
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A high-resolution multiple-reflection diffractometer has been built to study crystals distorted by epitaxy and defects in nearly perfect crystals. The diffractometer combines the merits of the two-crystal four-reflection monochromator (to define a narrow wavelength range with a tailless reflectivity profile) and an an…
Article The Cycling Behavior of Multi-Component Mischmetal — Nickel Hydrogen Storage Alloys on Cycling with Industrial Hydrogen* was published on February 1, 1989 in the journal Zeitschrift für Physikalische Chemie (volume 164, issue 2).
Abstract The phase diagram of the LiCl–ZnCl2 system was determined. The system contained one intermediate compound, Li2ZnCl4; it transformed from the normal spinel to the olivine structure at 215 °C. Electrical conductivity measurements showed a high ionic conductivity of 2.0 × 10−4 S cm−1 280 °C.
Wavelength (600-1600 nm) and time (1000-10000 h) dependence of the 'in situ' /sup 60/Co gamma ray-induced light losses in the pure silica core fibers of high OH and low OH contents, and single mode have been measured under various experimental conditions of high (10/sup 6/ R/h) and low (10/sup 2/ R/h) exposure rate ir…
Silver-indium-cadmium (Ag-In-Cd) control rod behavior in severe reactor accidents is examined with a goal of improving the methodology used to estimate reactor accident source terms. Control rod behavior in both in-pile and out-of-pile experiments is reviewed. A mechanistic model named VAPOR is developed that calculat…
Precision x-ray studies, polarization and electrocaloric measurements have been made with PST-PSN solid solutions in the temperature range −180–+80°C. The large electrocaloric effect δT = 1.0–1.7°C is due to both particular features of structure rearrangement at the 1-order phase transition in the materials and a high…
A Monte Carlo calculation has been performed to determine the transmission of broad constant-potential x-ray beams through Pb, concrete, gypsum wallboard, steel and plate glass. The EGS4 code system was used with a simple broad-beam geometric model to generate exposure transmission curves for published 70, 100, 120 an…
The phase behavior and electro-optic phenomena observed in a new system of blue phase mixtures have been determined. The mixtures, which include both cyanobiphenyl and chiral ester components, have relatively high pitch values (∼0.3 μm) but nonetheless exhibit broad blue phase temperature ranges (∼2.5°C total). On app…
A high dc field (1 and 3 kV / mm) was applied to BaTiO 3 and PZT ceramics, electrically induced microcracks occur at the grain boundaries and propagate into the grains. The number of cracks becomes larger with increasing grain size and poling field.
Electric-field-induced molecular reorientation is studied in the magnetically biased ferronematic liquid-crystal (FNLC) film. A theory derived from the free energy of the system is given. To investigate the field-induced distortion, we have measured the optical birefringence which depends on the integration of the dir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModifying role of alkali-metal cations in borate glass networksE. I. KamitsosCite this: J. Phys. Chem. 1989, 93, 4, 1604–1611Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://pubs.acs.org/doi/10.10…
The first measurements of the d.c. electrical conductivity and the low-frequency (static) dielectric constant of samarium phosphate glasses (in the composition range 5 to 25 mol% Sm2O3) are reported. A break in the slope of the Arrhenius plot divides the conductivity data into two temperature regimes, the conductivity…
The step-like change of the temperature at the field-induced first-order phase transition in the lead scandium tantalat (PST) ceramic is used for the electrocaloric refrigeration. The high values of the electrocaloric effect δT = 1.4 − 1.8 K at E = 15 − 25 kV/cm confirm a high efficiency of energy transformation in PS…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared and x-ray diffraction studies of a semirigid polyurethaneS. K. Pollack, D. Y. Shen, S. L. Hsu, Q. Wang, and H. D. StidhamCite this: Macromolecules 1989, 22, 2, 551–557Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published in…
Bacillus sphaericus 2362 is pathogenic for mosquito larvae and is being considered for large-scale production as a larvicide. The inability of the bacteria to metabolize carbohydrates requires that they be grown on proteinaceous media. This bacterium was found to be unable to transport glucose or sucrose into the cell…
Microphase separation in semidilute solutions of block copolymers in nonselective good solvent is analyzed. The swelling due to the presence of solvent is taken into account. The solvent effects on the thermodynamics in the disordered region and in the ordered region in the weak segregation limit are discussed. It is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA simple route to hexacarbonyldiiron complexes containing a bridging thiolate and an organic bridging ligand by means of [(.mu.-RS)(.mu.-CO)Fe2(CO)6]- intermediatesDietmar. Seyferth, Gary B. Womack, Colin M. Archer, and John C. DewanCite this: Organometallics 1989, 8, 2, 430…
The grain‐boundary mobility in magnesium aluminate spinel (MgO · nAl 2 O 3 ) of magnesia‐rich ( n < 1) and alumina‐rich ( n > 1) compositions has been measured from normal grain growth in dense, hot‐pressed samples. Over the temperature range 1200° to 1800°C, the mobility in magnesia‐rich compositions is found t…
Tungsten bronze ferroelectrics which have a morphotropic phase boundary (MPB) can have a number of enhanced dielectric, piezoelectric, and electrooptic properties compared to more conventional ferroelectric materials. The structural and ferroelectric properties of several MPB bronze systems are presented, including da…
The specific crude oil present is shown to have a major effect on the corrosion of steel in crude oil/brine production environments. The addition of crude oil to a brine (chloride-containing water) lowers the measured corrosion rate of steel exposed to the mixture, but different crude oils can have significantly diffe…