Materials Literature
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We report a high-resolution x-ray diffraction study of the freezing transitions of krypton on graphite for coverages above one monolayer. For pressure $P>430$ Torr there is a single continuous incommensurate-fluid-to-incommensurate-solid freezing transition. For $P<430$ Torr the freezing at fixed pressure is dou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrazole/imidazole and pyrazolato/imidazolato complexes of pentacyanoferrate(II/III) and pentaammineruthenium(II/III). LMCT transitions of low-spin d5 complexesCraig R. Johnson, Wayne W. Henderson, and Rex E. ShepherdCite this: Inorg. Chem. 1984, 23, 18, 2754–2763Publication…
Abstract The influence of chemical structure on mechanical properties of polyurethane ionomers (PU ionomers) has been examined. NCO‐terminated prepolymers prepared from primarily 4,4‐methylene bis(phenyl isocyanate) (MDI) and poly(oxytetramethylene) glycol (PTMO) were chain extended with tertiary amine‐containing diol…
Abstract Polypyrrole films prepared by anodic polymerization of pyrrole on Pt or SnO2-coated glass show redox behavior in aqueous electrolyte solutions containing a supporting electrolyte alone. Transfer of electrolyte anions into and from the film is involved in the redox reaction similarly with acetonitrile solution…
Article Studies on clathrasils. IV. Crystal structure of dodecasil 1 H, a synthetic clathrate compound of silica was published on August 1, 1984 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 166, issue 1-4).
Two systems were used to generate collagen fibrils in vitro by enzymic cleavage of intermediates in the conversion of procollagen to collagen. In one system fibrils were generated by using procollagen NH2-terminal proteinase to cleave pNcollagen, the intermediate which contains the NH2-terminal but not the COOH-termin…
Ellipsometry and ac impedance measurements were employed for in situ investigation of anodic oxide films on Ru and of oxide films formed by thermal decomposition of Ru chloride. An instrumental setup for experiment control, data acquisition, and data analysis in automated measurements of the ellipsometric parameters a…
Article Bergslagite, a mineral with tetrahedral berylloarsenate sheet anions was published on August 1, 1984 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 166, issue 1-4).
Abstract Neu dargestellt wurde Na 5 [MnO 4 ] aus den binären Oxiden [500°C, 14 d, Ag‐Bömbchen] als braunes Pulver bzw. in Form roter Einkristalle [700°C, 3d]. Die orthorhombische Kristallstruktur (a = 5,822, b = 7,769, c = 6,005 Å, 609 I o (hkl), R = 0,030, MoKα, Zweikreisdiffraktometerdaten (Stasi, Fa. Stoe)) ist dur…
Abstract A design of a high‐temperature cell (used with a Spex‐1403 Ramalog spectrophotometer) for Raman studies with 90° geometry is given. Raman spectra of normal ( d 0 ) and denteriated ( d 12 ) tetramethylammonium chlorides in phases III and II are reported, together with their assignments. On the basis of the tem…
This paper describes HV laboratory tests to study the surface leakage current performance of desert-exposed insulators. It was found that inland desert meteorological conditions and contamination vary considerably from coastal desert areas. Leakage current studies on the simulated desert-polluted insulators exhibit so…
Abstract Dielectric loss measurements are reported for polystyrene, crosslinked polystyrene, polyacrylamide, branched polyacrylamide, and poly(methyl methacrylate) at 1 and 10 kHz f over the temperature range −85 to +100°C. Crosslinking and branching have a pronounced effect on the dielectric relaxation spectra of pol…
Etude de neuf Cepheides de faible amplitude et de courte periode (<8 jours) afin de determiner leurs parametres physiques et proprietes pulsationnelles
It is experimentally known that an antiferromagnetic compound CrSb ( T N ≧700 K) with a NiAs type crystal structure exhibits unusual magnetic properties, that is, sharp decrease of magnetic moment, steep increase of magnetic specific heat and of magnetic susceptibility just below T N with increasing temperature. These…
Redetermination, par diffraction X sur monocristal, de la structure cristalline de BiSBr en utilisant des methodes plus modernes que celles effectuees par Donges (1950). Groupe d'espace Pnam avec a=8,1666, b=9,8532, c=4,0492 A, Z=4. Description de l'arrangement structural des atomes dans la maille. Formation d'un syst…
Copper, a noble metal that occurs naturally in its elemental form, is almost totally impervious to corrosion from soils found worldwide. But it would be misleading to infer that copper will not corrode. This article identifies a host of possible situations in which copper pipe or tubing may be subject to external corr…
The tensile properties of solution-treated Incoloy alloy 800H, Hastelloy-X, Nimonic-86, and Inconel-617 have been determined in the temperature range 20 to 1000°C. The strength parameters at temperatures above 700°C showed a strong dependence on the strain rate; at low strain rates the deformation was dominated by cre…
Abstract The structural phase transition (PT) of elpasolite‐type crystal Cs 2 NaBiCl 6 is investigated by neutron scattering. At first the acoustic phonon dispersion is measured at room temperature for the highsymmetric directions Δ, ∑, and Λ of the Brillouin zone. The transverse rotary mode is studied for phonon wave…
This paper presents a mechanistically consistent model of impact damage based on elastic failures due to tensile and shear overloading. An elastic axisymmetric finite element model is used to determine the dynamic stresses generated by a single particle impact. Local failures in a finite element are assumed to occur w…
A corrosion program is being carried out to establish the long-term corrosion behavior of candidate alloys for the prototype nuclear process (PNP) reactor primary circuit. Results are presented for corrosion tests performed in impure helium over the temperature range of 700 to 900 °C for times up to 10000 h.In the hel…