Materials Literature
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High resolution electron microscopy of a set of Sm(Co.725Fe.20Cu.055Zr.02)7.5magnets has been used to characterize the structure and the size of the various micro-phases present. Our investigations of the samples, which were sintered at 1215°C, subsequently isothermally aged in steps of 50° at temperatures between 700…
Abstract The elastic constants of the lamellar compounds Gas, GaSe, InSe are measured on several samples using an ultrasonic method, and the results are compared with previous publications. The variations of C 33 , C 11 , and C 66 with an hydrostatic pressure are measured up to 3 kbars. In the range of pressure studie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular excimer emission of poly(N-vinylcarbazole) and rac- and meso-2,4-di-N-carbazolylpentane. Model substances for its syndiotactic and isotactic dyadsF. Evers, K. Kobs, R. Memming, and D. R. TerrellCite this: J. Am. Chem. Soc. 1983, 105, 19, 5988–5995Publication D…
Abstract Exchange isotherms were prepared for Na + in Na + →Ca 2+ and Na + →Mg 2+ exchange reactions, and for Mg 2+ in Na + →Mg 2+ exchange reactions, at 298 K on Wyoming bentonite suspended in a 0.05 M perchlorate background. These isotherms were essentially congruent with the appropriate thermodynamic nonpreference…
Following a review of statistical models of the failure of single fibers and bundles of these fibers, algebraic recurrence formulas are derived that generate expressions for the failure probabilities of bundles of classical fibers. One of these recurrence relations is suitable for the accurate numerical calculation of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative study of the electrode reactions of 12-molybdosilicate and 12-molybdophosphateKei Unoura and Nobuyuki TanakaCite this: Inorg. Chem. 1983, 22, 20, 2963–2964Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic behavior of atactic polypropyleneDaniel L. Plazek and Donald J. PlazekCite this: Macromolecules 1983, 16, 9, 1469–1475Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1 September 1983https://pubs.acs.org/d…
Abstract Three principal modes of formation are apparent for authigenic smectites in Recent marine sediments: alteration of volcanic rocks and glass, low-temperature combination of biogenic silica and Fe-oxyhydroxides, and direct precipitation from hydrothermal fluids. The latter two mechanisms are discussed with refe…
Abstract Rubber vulcanizates can be reclaimed by milling them with curing ingredients. Physical properties of the RR vulcanizates are inferior to those of the control vulcanizate. RR compounds exhibit poor processing characteristics. Poor physical properties and processing characteristics can be improved by blending w…
The thermal decomposition of poly(ethylene terephthalate) has been studied using a conventional dynamic thermogravimetric technique in a flowing air atmosphere at several heating rates between 0.1°C and 100°C/min. The dynamic thermogravimetric analysis curve and its derivative have been analyzed using a variety of ana…
The x-ray-induced ‘‘blue’’ emission from commercially available, high-quality synthetic quartz has been studied between 80 and 300 K. Three overlapping bands, each having a different quenching temperature, have been experimentally resolved in the as-grown crystals. These bands peak at 440, 425, and 380 nm; their half-…
Abstract The LO‐phonon—plasmon coupling in n‐ZnO single crystals is investigated by Raman spectroscopy at room and liquid nitrogen temperatures. The energy shift and halfwidth broadening of the LO‐phonons relative to the uncoupled modes are analyzed to get the concentration and mobility of the charge carriers. These r…
Pyrochlore structure oxides described by the formula , where , , and , have been evaluated for oxygen electrocatalysis. In alkaline electrolyte between room temperature and 110°C, these materials display significantly lower polarizations than any other catalyst for evolution and are among the best for reduction. Rotat…
Summary A range of extractants commonly used in soil studies, both to clean up the crystalline clay minerals by dissolving poorly ordered phases, and to assist in the classification of soils, has been used to assess their efficiency in extracting inorganic forms of translocated Al, Fe and Si from a podzol Bs horizon.…
Hydrogen trapping in AISI 4340 steel was investigated by thermal analysis at a constant heating rate of 3·4 K min−1. Peaks were observed in the evolution rate v. temperature plots at 388, 545, 611, 678, and 768 K in AISI 4340 steel samples having either pearlitic or spheroidized carbide structure, and analysis suggest…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonochemistry and sonocatalysis of metal carbonylsKenneth S. Suslick, James W. Goodale, Paul F. Schubert, and Hau H. WangCite this: J. Am. Chem. Soc. 1983, 105, 18, 5781–5785Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published ini…
At Ni or Raney Ni Al‐type electrodes subjected to cathodic polarization with evolution in alkaline solutions, characteristic time dependent currents are observed when measurements are made in the direction of increasing or decreasing potentials. Also, after polarization to high cathodic overvoltage, appreciable quanti…
This paper examines the non-linear elastic behavior of fabric composites. Three types of non linearity including the shear deformation of fill threads, the extensional deformation of the pure matrix regions and transverse cracking of the warp regions have been taken into considerations. The non-linear constitutive rel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface characterization of copper(II) oxide-zinc oxide methanol-synthesis catalysts by x-ray photoelectron spectroscopy. 1. Precursor and calcined catalystsYasuaki Okamoto, Kiyotaka Fukino, Toshinobu Imanaka, and Shiichiro TeranishiCite this: J. Phys. Chem. 1983, 87, 19, 37…
The intrinsic crack tip processes of either propagation by cleavage or blunting by the nucleation of dislocations from the nonlinearly stressed region at the crack tip have been simulated by a molecular dynamics approach in alpha-iron and in copper, utilizing the Johnson and Morse potentials, respectively, and a new f…