Materials Literature
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A general expression for the light-scattering cross section in a magnetic semiconductor is developed in terms of a Raman tensor and a spin-correlation function. This expression is evaluated for the high-temperature, paramagnetic phase of the europium chalcogenides. In particular we show that the cross section can be a…
Abstract Raman spectra of single crystals TlGaS 2 and TlGaSe 2 are investigated in equilibrium conditions at room temperature under various hydrostatic pressures up to 7.25 and 9.27 kbar, respectively. Phase transitions at about 5 kbar are shown to occur in both the single crystals. Mode parameters γ i = (1/ v i ) (d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of [Rh2(CO)2(.mu.-Cl)((C6H5)2PCH2P(C6H5)2)2][BF4]. A binuclear "A-frame" complex showing the open "active" siteMartin Cowie and Stephen K. DwightCite this: Inorg. Chem. 1979, 18, 10, 2700–2706Publication Date (Print):October 1, 1979Publication History Published onl…
The glass transition temperature of nylon 6–inorganic salt mixtures has been investigated. Tg not only increases monotonically with the salt content but the rate of increase depends on the type of salt. Infrared measurements indicate that metal ions form adducts with the amide group, and, as a result, the nylon chains…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclodehydration reactions using molten sodium tetrachloroaluminateL. G. Wade Jr., K. J. Acker, R. A. Earl, and R. A. OsteryoungCite this: J. Org. Chem. 1979, 44, 21, 3724–3725Publication Date (Print):October 1, 1979Publication History Published online1 May 2002Published ini…
The dose rate effect on the mechanical and electrical properties of representative insulating and jacket materials has been studied. Crosslinked polyethylene (XLPE),thylene ethylene-propylene terpolymer (EPDM), and some chlorine containing polymeric materials are irradiated in air at several dose rates. XLPE degrades…
Abstract The equilibrium constants, enthalpy, and entropy of the reversible binding of nitrogen oxide to Fe(II)edta in an aqueous solution have been measured in the temperature range 38.5 to 70 °C. Experiments were carried out by absorbing NO under O2 free conditions. The results show that, in the absorption of NO wit…
Abstract It was found that the breakup‐time of jets formed by shaped charges of cylindrical symmetry is given very accurately by the formula: This formula is obtained from a general principal applied here for the first time which says that the breakup‐time of homogeneous ductile metals under very high strain rates is…
The precipitation process of nickel ferrite (NiFe2O4) from silicate glasses has been studied by electron spin resonance (ESR). The ESR linewidth ΔH1/2 and effective g value were measured as functions of heat-treatment temperature and time. Both the linewidth and effective g value change drastically near the glass tran…
The rates of oxidation of yttria hot‐pressed silicon nitride were measured at temperatures from 1620° to 1796°K in 20 kPa of oxygen for times to about 25 hr. Measurements were made by volumetric and gravimetric methods. The oxidations were parabolic in the range studied, and the rate constants were much smaller than t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDioxygen complexes of rhodium porphyrinsBradford B. Wayland and Alan R. NewmanCite this: J. Am. Chem. Soc. 1979, 101, 21, 6472–6473Publication Date (Print):October 1, 1979Publication History Published online1 May 2002Published inissue 1 October 1979https://pubs.acs.org/doi/1…
Abstract Crystallinity degrees exert influence on the stability of high molecular weight poly(ethylene oxide)s, POE's, in solid state. It was found that the degradation of these POE's is connected with an increase of crystallinity degrees. Samples being prepared under the terms of the strontium carbonate initiated bul…
Gaseous carbides of uranium, UC, UC2, UC3, UC4, UC5, and UC6 have been observed in a mass spectrometric investigation of the Knudsen cell effusate from a thorium–uranium–rhodium–graphite system at high temperatures. Partial pressures of the carbide molecules were measured as a function of temperature in the 2300–2700°…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of hydrogen transfer from metal hydridesR. J. Klingler, K. Mochida, and J. K. KochiCite this: J. Am. Chem. Soc. 1979, 101, 22, 6626–6637Publication Date (Print):October 1, 1979Publication History Published online1 May 2002Published inissue 1 October 1979https://pub…
A computer program POWLS for refinement of crystal structures and magnetic structures from X-ray or neutron diffraction powder diagrams is reported. The program uses integrated intensities as the observed quantities. It is highly flexible.
Abstract Solid acid catalysts were obtained by exposing Fe(OH)3 or Fe2O3 to 0.1–0.5 N H2SO4 and then calcining in air at 500°C. Fe(OH)3 used was prepared by hydrolyzing FeCl3 or Fe(NO3)3 with ammonia, and Fe2O3 by decomposing Fe(NO3)3 at 200°C. These catalysts were active for the skeletal isomerization of butane at ro…
Developments in Extended X-Ray Absorption Fine Structure Applied to Chemical Systems, Page 1 of 1 < Previous page | Next page > /docserver/preview/fulltext/physchem/30/1/annurev.pc.30.100179.001243-1.gif
Abstract Cretaceous bentonites were collected in outcrop from the Sweetgrass Arch and the Disturbed Belt in Montana. The mixed-layer illite-smectite (I/S) components of the bentonites from the Sweetgrass Arch have from 0 to 25% illite layers and no detectable structurai Fe 2+ , whereas the samples from the Disturbed B…
Abstract A previously developed model of simple penetrant diffusion is extended to encompass complex penetrants of idealized molecular shape, characterized by dimensions of length, width, and thickness. Expressions are obtained for D(0,T) , the diffusion coefficient at zero penetrant concentration ( c ), and the fract…
The identification and distribution of chemical species comprising the native oxides of anodically and thermally grown films have been studied using XPS in conjunction with ion milling and chemical etching. Low angle electron diffraction was used to identity crystalline surface (∼150Å) layers of produced thermally fro…