Materials Literature
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The internal friction and modulus changes in pure and hydrogenated nickel are measured after plastic deformation at frequencies of 2 Hz and 30 kHz. The hydrogen dissolution strongly diminishes a Bordoni-type peak (B peak) but develops a Snoek–Köster-type peak (SK peak) at a temperature well above the B peak. The SK pe…
Programmed cooling experiments with compositions in the system MgO-SiO 2 ranging from 59 wt.% SiO 2 (with olivine on the liquidus) to 63 wt.% SiO 2 (with protoenstatite on the liquidus) cooled at rates of from 0.4 to 25% min crystallize forsterite but not pyroxene. Because pyroxene does not nucleate, the forsterite pl…
dc breakdown and corona inception voltages are reported for SF6-air and SF6-CO2 mixtures in positive and negative rod-plane gaps. These voltages are compared with values obtained for SF6-N2 mixtures. The results show that the breakdown voltages of SF6-air mixtures exhibit corona stabilization over a pressure range whi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeacylation and deformylation of pyrrolesKevin M. Smith, Michiko Miura, and Hani D. TabbaCite this: J. Org. Chem. 1983, 48, 24, 4779–4781Publication Date (Print):December 1, 1983Publication History Published online1 May 2002Published inissue 1 December 1983https://doi.org/10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMNDO studies of proton affinity as a probe of electronic structure. 2. Boranes and carboranesRoger L. DeKock and Craig P. JasperseCite this: Inorg. Chem. 1983, 22, 26, 3843–3848Publication Date (Print):December 1, 1983Publication History Published online1 May 2002Published i…
A detailed analysis of hyperstoichiometric carbide fuel, which operated under sodium-bonding conditions up to 12.5 at. % burnup in the Rapsodie reactor, yields the description of the four contributions to geometric fuel swelling as functions of temperature and burnup: (a) solid fission products and cesium, (b) fission…
Abstract The synthesis and chain extension of polyisobutylene having nonfluxional terminal cyclopentadiene groups is described. The fluxional behavior of silylcyclopentadiene end groups was previously found to prevent Diels–Alder dimerization of the end groups. The incorporation of a propyl moiety between the silicon…
High‐resolution SEM photographs, N 2 adsorption isotherms, Hg porosimetry, and micrometer measurements were used to characterize CaO particle shapes and pore‐size distributions that result when calcite crystals are decomposed in vacuum at 686°C. The surface area of the CaO produced from large calcite crystals is const…
In the anionic copolymerization of elemental sulfur (S8) with propylene sulfide (P) below the floor temperature of elemental sulfur homopolymerization (Tf = 159°C), there is a certain concentration of elemental sulfur left when copolymerization is completed ([S8]eq). The dependence of [S8]eq on the feed ratio [P]0/[S8…
Abstract Microprobe analyses of members of the erlichmanite-laurite series from Guma Water and Senduma, Sierra Leone and Tanah Laut, Borneo, indicate that complete solid solution is possible between OsS 2 and RuS 2 with considerable substitution of Os and Ru by Ir, Rh, and Pt. The cell size of the erlichmanite from Gu…
Various Na 2 SO 4 ‐Na 2 CO 3 ‐CaCO 3 ‐SiO 2 combinations were studied by differential thermal analysis to elucidute the role of Na 2 SO 4 in soda‐lime‐silica glassmelting reactions. It was found that Na 2 SO 4 encourages the formation of wollastonite at 850° to 900°C. The solid‐state reaction of Na 2 Ca(CO 3 ) 2 occur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox chemistry of iron tetraphenylporphyrin imidazolate-chelated protoheme, and of their iron(II)-superoxide adducts in dimethyl sulfoxideStephen E. Jones, G. Susan Srivatsa, Donald T. Sawyer, Teddy G. Traylor, and Terry C. MinceyCite this: Inorg. Chem. 1983, 22, 26, 3903–3…
2,2′-Bipyridinium pentachloroantimonate (III) and the metastable modification of 4,4′-bipyridinium pentachloroantimonate(III) were synthezised and investigated by single crystal X-ray diffraction analysis. The structures consist of 2,2′-bipyridinium and 4,4′-bipyridinium cations, respectively, and of pentachloroantimo…
We have prepared the layered compounds $\mathrm{Li}{\mathrm{Ti}}_{1\ensuremath{-}y}{M}_{y}{\mathrm{S}}_{2}$ ($M=\mathrm{V},\phantom{\rule{0ex}{0ex}}\mathrm{C}\mathrm{r},\phantom{\rule{0ex}{0ex}}\mathrm{F}\mathrm{e}$) by direct synthesis from a mixture of ${\mathrm{Li}}_{2}$S and the appropriate elements. The structure…
The ASTM standard ferric sulfate-sulfuric acid test (ASTM A262-B) and copper-copper sulfate-sulfuric acid test (ASTM A262-E) have been modified to quantify the degree of sensitization (DOS) of ferritic stainless steel Types 430, 430 Ti, 430 Nb, 434, 444, and 446. The modified ferric sulfate-sulfuric acid test consists…
Binary mixtures both components of which are liquid crystals are known to form continuous mixed liquid crystals.1 Most of them do not undergo any change in their mesomorphic textures, though a few have been found to give rise to different textures.2 We report here a binary system consisting of (A) p-nitrophenyl-p'-n-a…
The optical properties of a periodic structure characterized by a uniform rotation of the dielectric tensor about a given axis are theoretically analyzed. The electromagnetic wave is described as a superposition of elementary modes having the form of Bloch waves. Each elementary mode is represented by a sum of plane w…
The dynamics of ferroelectric phase transition of KH2PO4 (KDP) have been clarified by means of Raman scattering experiments. The locally and momentarily distorted PO4 tetrahedrons play the main role on the ferroelectric phase transition in KH2PO4. The broad mode below ∼150 cm-1 in x(yx)y spectrum above the transition…
Abstract The thermal oxidation of undoped trans ‐polyacetylene powder in dry air has been studied and the principal features of the mechanism have been developed. Thermogravimetric and differential thermal analysis reveal an exothermic process that first leads to a weight increase, followed by precipitous weight loss…
Abstract Detailed quantitative studies are reported on the kinetics of acetonitrile pyrolysis using an isothermal quartz tubular flow reactor at 720–1033 K and 1 atm. Pressure using flow rates, in nitrogen, of 2–200 ml min −1 . The pyrolysis of several other nitriles (acrylonitrile, propionitrile, methacrylonitrile an…