Materials Literature
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Abstract Thin solid films of PMMA doped with donor–acceptor norbornadienes were prepared, and their photochromic properties were examined. The photochromic solid films have absorption at a visible region, and their photochemical decolorization due to valence isomerization proceeded in high quantum yields. They show re…
A summary of the effects of hydrostatic pressure on the properties of KDP and related crystals is presented with some emphasis on recent results. Topics discussed include the decrease and ultimate vanishing of Tc with pressure, the underdamped soft mode, the strong deuteration dependence of the pressure effects, the p…
Reaction of Fe(ClO4)2·6H2O with N,N′,N′-trimethyl-1,4,7-triazacyclononane (L) in methanol and addition of solid NaSCN, NaOCN, or NaN3 gave yellow compounds of the type [{FeLX2}2](X = NCS, NCO, or N3). [{FeL(NCS)2}2] is a binuclear, neutral complex in the solid state containing two bridging and two terminal thiocyanato…
Six liquid crystalline prophyrins are described which exhibit discotic mesophases over a broad temperature range before melting to stable, low viscosity, isotropic liquids suitable for capillary filling into photovoltaic cells.
High pressure phase equilibrium constraints on the origin of
Boundary value problems are difficult to treat numerically when they are defined in domains with nonsmooth boundaries. In this situation standard techniques lose accuracy near the resulting singularities, and global pollution takes place. The reason for the appearance of this effect is the lower regularity of the solu…
Presents topics at a level that is easy to understand by all. Emphasizes major concepts with numerous illustrations. Discusses the high standards of performance and reliability that composites materials offer. Makes mold and tooling parameters easy to understand. Provides valuable sources of information, specification…
Description STP 955 resulted from a major international forum for the exchange and discussion of both the fundamental and technological aspects of behavior change in materials exposed to radiation environments. 66 papers comprise this book whose contents have been categorized into seven distinct technical areas: radia…
We use the linear muffin-tin orbital method and the local density approximation to calculate the cohesive energies, equilibrium lattice constants and bulk moduli of ThO2, UO2 and PuO2. These calculations provide a framework within which to discuss the bonding in this system. The band structure of UO2 is examined in pa…
Abstract Mössbauer spectra of three nontronite samples (Garfield H33a and SWa‐1 from Washington State, U.S.A., and a sample from Hundsangen, Germany), taken between room temperature and 4.2 K in the velocity range ± 10.5 mm/s, showed between 2.9 and 13% of the total iron to be bound in goethite and not in the nontroni…
An ultra high resolution scanning electron microscope, which is composed of a cold cathode field emission gun and an in-lens system for specimens, has been developed. Probe size is estimated 0.8nm at 30kV by calculation and confirmed experimentally using high atomic number samples such as fine Pt particles sputter-coa…
This paper presents an overview of factors affecting irradiation growth of zirconium alloys. Recent data obtained from irradiation programs in EBR-II, ATR, and NRU reactors are used to illustrate the effects of various microstructural and experimental factors on the growth of Zircaloy, zirconium, and zirconium-niobium…
The effects of alloy chemistry and thermal processing on corrosion performance of Zircaloy are shown to provide significant insights into the mechanisms governing nodular corrosion formation. Nucleation and growth behavior of nodular oxide in ex-reactor and in-reactor tests were studied phenomenologically, with the re…
Le courant en fonction du potentiel et l'impedance d'une electrode a disque de cuivre dans une solution d'acide sulfurique et de sulfate de cuivre ont ete etudies en presence de diverses fractions moleculaires de polyethylene glycol (PEG). Les resultats suggerent que PEG forme une barriere adsorbee au depot de cuivre.…
Description Twenty papers will aid investigators conducting failure analysis of advanced composite and metallic materials. Composites papers focus on failure of continuous fiber graphite/epoxy material systems, covering delamination propagation, the effects of impact and radiation damage, and the fracture surface char…
The green mixed-valence dimer [L2Mn2(µ-O)2(µ-MeCO2)][BPh4]2·MeCN (L = 1,4,7-triacacyclononane) is formed on hydrolysis of [L2Mn2(µ-O)(µ-MeCO2)2]2+ in water in the presence of air; characterization by X-ray crystallography showed the presence of the di-µ-acetato-dimanganese(III,IV) core, and temperature dependent magne…
Zirconium alloys are susceptible to a mechanism for crack initiation and propagation called delayed hydride cracking. From a review of component failures and experimental results, we have developed the requirements for preventing this cracking. The important parameters for cracking are hydrogen concentration, flaws, a…
Evaluations of pure beryllium, plus 72 binary beryllium alloys. Bibliography through 1986. Required reference sources for engineers and scientists alike, each volume in the Phase Diagram Monograph Series presents the most complete, authoritative, and reliable phase equilibria information ever published on the alloys.…
Ultrasonic irradiation increases the rates of intercalation (by as much as 200-fold) of organic and organometallic compounds into various layered inorganic oxide and sulphide host solids.
Abstract Samples of the <2‐µm fractions of five pure smectites and six soil clays were reduced by sodium dithionite in the presence of a potassium citrate‐bicarbonate buffer. Subsequently, they were freed of excess electrolyte by dialyzing them in a deoxygenated, 10 −3 M KCl solution. Subsamples of the resulting cl…