Materials Literature
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Two new compounds Cs4SnBr6 and Cs4SnCl6 have been prepared and the CsBr–SnBr2 phase diagram is described. Phases of the type Cs4Sn1 –nPbnBr6 –xClx(where n= 0–1, x= 0–6) have been examined by X-ray diffraction, electrical conductivity, Mössbauer spectral, and optical reflectance techniques. The electrical conductivity…
The electrical conductivity of polymers must be understood in order to improve their performance as electrical insulators. At the present time, there is a need to produce materials with lower conductivity than is currently available without compromising the desirable mechanical properties in order to satisfy the conti…
Based on a cost analysis of uranium extracted from seawater, it is concluded that the world’s energy requirements for the next 5 billion years can be met by breeder reactors with no price increase due to fuel costs.(AIP)
Abstract Alfalfa ( Medicago sativa L.) was established at two field locations in Colorado in 1976 and triple superphosphate applied at rates of 25 and 50 kg P/ha annually or 75 kg/ha in a single application at seeding. The initial P applications were incorporated while subsequent applications were topdressed. Soil pro…
Ferrites for inductors and transformers , Ferrites for inductors and transformers , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Transmission electron microscopy is used to investigate the spatial arrangement of gas bubbles produced in the metals, Cu, Ni, Au, stainless steel and Ti irradiated with He+ at temperatures ∼ 300 K. For metals having a high degree of crystalline perfection within grains, a gas bubble superlattice is formed at high He…
The oxidation mechanism of molten Al–Mg alloys was studied by means of a thermal balance, X-ray diffraction and EPMA. Oxides produced in the Al–Mg (2–12%) alloys oxidized at 923 K to 1173 K for 10.8 ks (3 h) were MgO or/and MgAl2O4. MgO was produced in an early stage of oxidation, and its amount increased temporarily…
Mixtures of broad nematic temperature ranges that permit acceptably short switching times of electro-optical displays at −40°C can be composed of compounds of relatively low polarity and high transition temperatures from the nematic to the isotropic state (T NI. Structures combining 1,4-phenylene and trans-1,4-cyclohe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiconductor electrodes. 48. Photooxidation of halides and water on n-silicon protected with silicide layersFu Ren F. Fan, R. Gerald Keil, and Allen J. BardCite this: J. Am. Chem. Soc. 1983, 105, 2, 220–224Publication Date (Print):January 1, 1983Publication History Publishe…
The present paper is concerned with the kinetics of thermal decomposition of manganese oxides and nonstoichiometric compounds formed in these reaction processes, studied by means of the thermal analyses (TG, DTA and DSC) and gas chromatography (GC).The decomposition of MnO2 to Mn2O3 proceeds at about 756 K, and the he…
A short review is given of recent experimental studies of helium in metals, emphasizing fundamental He behavior at low temperatures (room temperature and below), low He concentrations (∼1 at.% He) and in the absence of radiation induced defects. Some of the main points are: (a) interstitial He is generally locally mob…
Water-soluble, diamagnetic metalloporphyrins have been prepared which contain either zinc(II), palladium(II) or tin(IV) ions as the central metals and their photophysical properties have been measured in dilute aqueous solution. All the compounds undergo efficient intersystem crossing to form long-lived excited triple…
This book should be of interest to undergraduates and postgraduates in materials engineering.
The biodegradability of poly (ethylene carbonate) and poly (propylene carbonate), synthesized from carbon dioxide and alkylene epoxides, was investigated. The biodegradation of poly (ethylene carbonate) pellets in the peritoneal cavity in rats was observable 2 d after implantation and was nearly completed within 2 wee…
A detailed X-ray photoelectron, i.r., and Raman spectral study has been made of Ce2(MoO4)3 and five novel cerium molybdenum oxides (α- and β-Ce2Mo4O15, β- and γ-Ce2Mo3O13, and Ce8Mo12O49), which are of particular interest as they are closely related to the cerium molybdenum oxide species which are expected to play an…
Description This book is aimed at the practicing engineer who is involved with the design, fabrication of operation of zirconium core components. The Metals Properties Council, as part of its continuing role of collecting, analyzing, and updating materials properties data, has arranged for the preparation of this book…
Specimens of Ca2Nd8(SiO4)6O2 were doped with 1.2 wt% 244Cm and the effects of self-radiation damage from alpha decay were determined as a function of cumulative dose. The macroscopic volume of the specimens increased exponentially with dose to a limiting (saturation) value of ∼8.0%. The initially crystalline material…
Diagnose latine de la nouvelle famille des C. Cle de determination basees sur la microscopie optique ou electronique. Traitement systematique
The available models for grain-boundary diffusion are reviewed together with the relevant mathematical techniques for extracting the grain-boundary diffusivity from the various types of experimental data. The more useful experimental techniques are described, fo11owed by a presentation of results that shed light on th…
The radiation enhanced diffusion (coefficient D*) of U-233 and Pu-238 in UO2 and (U, Pu)O2 with 2.5 and 15% Pu was measured during fission in a nuclear reactor. Normal diffusion sandwiches with a thin tracer layer were used. A radio-frequency furnace allowed the temperatures to be varied between 130 and 1400°. Neutron…