Structure of μ-MnAl4 with composition close to that of quasicrystal phases
Etude experimentale et theorique de la structure cristalline.Description des polyedres de coordination.
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Glassy phenomena in disordered perovskite-like crystals
Peculiarities of phase transitions in disordered perovskite-like crystals—PbMg1/3 Nb2/3 O3 (PMN) and Na1/2 Bi1/2 TiO3 (NBT) have been studied by neutron scattering. The strong quasielastic scattering (QES) related to ferroelectric critical fluctuations has been observed instead of expected inelastic scattering of soft…
Bioresorbable polymers for temporary therapeutic applications
Abstract Polymer science is mature enough to allow one to think about tailor‐making macromolecular compounds aimed at interacting purposely with living systems. Reasons for developing bioresorbable polymers for temporary therapeutic applications are discussed with respect to property adjustments and economical factors…
Strengths of Ceramic Fibers at Elevated Temperatures
Tensile strengths were measured and Young's moduli were estimated for two SiC‐based and three oxide ceramic fibers for temperatures from 25° to 1400°C. The SiC‐based fibers were stronger but less stiff than the oxide fibers at room temperature and retained more of both strength and stiffness to high temperatures. High…
A high-resolution multiple-crystal multiple-reflection diffractometer
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…
The Cycling Behavior of Multi-Component Mischmetal — Nickel Hydrogen Storage Alloys on Cycling with Industrial Hydrogen*
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).
Ionic Conductivity and Structure of Double Chloride Li2ZnCl4 in the LiCl–ZnCl2 System
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.
Dose rate effect on radiation induced attenuation of pure silica core optical fibres
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 Control Rod Behavior in Severe Reactor Accidents
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…
X-ray studies of electrocaloric lead-scandium tantalate ordered solid solutions
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…
Shielding Requirements for Constant-potential Diagnostic X-ray Beams Determined by a Monte Carlo Calculation
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…
Electric Field Induced Phase Transitions and Colour Switching in the Blue Phases of Chiral Nematic Liquid Crystals
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…
Grain‐Size Dependence of Electrically Induced Microcracking in Ferroelectric Ceramics
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 of a magnetically biased ferronematic liquid-crystal film
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…
Modifying role of alkali-metal cations in borate glass networks
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…
Electrical conductivity and dielectric constant of samarium phosphate glasses
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 optical ferroelectric ceramic as working body for electrocaloric refrigeration
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…
Infrared and x-ray diffraction studies of a semirigid polyurethane
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…
Carbohydrate metabolism in the mosquito pathogen Bacillus sphaericus 2362
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…
Theory of microphase separation in block copolymer solutions
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…