Materials Literature
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Abstract The crystal and molecular structures of the chloroacetato complexes of gadolinium(III), erbium(III), and ytterbium(III) indicated in the title were determined by the single-crystal X-ray diffraction method. In addition to these three complexes, the isomorphous dysprosium(III) salt was also obtained. Their che…
Abstract When subjected to heat and mechanical shear PVC decomposes via the elimination of HCl. This process is controlled most efficiently by the use of organotin stabilisers. This review outlines the basic degradation/stabilisation mechanisms which are involved in these processes. The organotin compounds of most com…
The surface interactions of the thermodynamically stable oxides of the firstrow transition metals with hydrazine, N2H4, have been assessed by X-ray photoelectron spectroscopy (X.p.s.), and the observed reactivity explained on the basis of the oxides' thermodynamic and acid–base properties. Microgravimetry, transmissio…
ZnO–CaO (molar ratio 9 : 1) exhibited a high catalytic activity (100% conversion) and selectivity (91%) for formation of acetone from ethanol at 673 K.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of metallo hydride, formyl, and alkyl complexes of Rh(TMTAA)Seth L. Van Voorhees and Bradford B. WaylandCite this: Organometallics 1987, 6, 1, 204–206Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 January 1…
This book compiles papers presented at a conference on the subject of advancement of materials and process engineering. Some of the topics discussed are: Effect of laser radiation on rapid processing of graphite-reinforced composites; fiber reinforced ceramic composites; thermal analysis for pultrusion process modelli…
A new compound WAlB has been prepared using α-WB single crystals as a starting material and Al metal as a flux in argon atmosphere, and the optimum conditions for obtaining the compound in a pure phase were examined. A pure WAlB phase was obtained by heating a mixture of α-WB (0.66wt%) and Al at 1500°C for 10h. The cr…
This paper describes a improved gas insulated bushing for ultra high voltage (UHV) SF6 gas insulated switchgear (GIS) which contains a simple capacitor core inside a porcelain housing. The effects of arrangement and capacitance of the capacitor core on the voltage distribution along the external porcelain surface were…
Effusion mass spectrometric measurements were made to obtain thermodynamic data for the gaseous mono- and di-hydroxides of calcium. An investigation of the reaction CaO(c)+½H2(g)= CaOH(g) in the temperature range 1720–1983 K led to third and second law ΔH°298 values of 444.3 ± 4 kJ mol–1 and 443.1 ± 16 kJ mol–1, respe…
Laue diffraction patterns have been recorded with synchrotron radiation for some very small crystals; in most of them the reflections are elongated radially. The Laue geometry is particularly sensitive to mosaic spread, and a relationship between mosaic spread and Laue spot extension is deduced. It appears that many v…
The dissolution of plagioclase and precipitation of kaolinite is a common late diagenetic process in sandstones. The common occurrence on a thin-section scale of patchy kaolinite adjacent to a dissolving plagioclase grain is consistent with diffusional transport of dissolved constituents combined with precipitation on…
Attempts to toughen composites by using matrix materials of high toughness have not met expectations. The rationales given generally fall into two categories: size effect and constraints. This paper critically examines these issues and proposes approaches to test these rationales. The constraint effect is considered i…
Abstract Die kristallinen Phasen von CsOH und CsOD wurden zwischen 23 K und dem Schmelzpunkt mit Röntgen‐ und Neutronenbeugungsexperimenten sowie mit kalorimetrischen, IR‐ und Ramanspektroskopischen Messungen untersucht: equation image equation image In CsOD (TlI‐typ) bilden die ladungsasymmetrischen Hydroxidionen bei…
A new insulation diagnostic method for XLPE cables containing water trees is presented. A dc component in the ac charging current of these cables was found to be a significant sign of the existence of water trees. The dc component has good correlations with such insulation characteristics of aged XLPE cables as ac bre…
On a étudié expérimentalement la dégradation hors d'équilibre de biotite naturelle alumineuse et riche en fer en utilisant, comme matériel initial, des éprouvettes d'un schiste de biotite bien caractérisé. Les expériences ont été réalisées à 800 °C, 1 kbar, pendant 2 jours à 8 semaines. Tous les produits de la réactio…
Attempts to improve transmission loss characteristics in fluoride fibers are described. Optical loss in current fibers is dominated by two major extrinsic loss factors, defect scatterers and impurities. Scatterer analysis using a Raman microprobe has revealed that the majority of them are ZrO2crystallites. These cryst…
A distinctive and widespread belemnite-bearing shale of the Tethyan region is well exposed in the Trans-Indus Salt Range as the Chichali Formation, where it contains two workable ironstone seams. Facies analysis indicates a pronounced deepening in the Upper Oxfordian and Kimmeridgian followed by two regressive cycles…
The “smectic D ” mesophase has been described in the past as a cubic arrangement of rods. In the present work, a molecular model, in which rods are formed by the stacking of small groups of molecules lying side by side, is proposed. The junction of the rods occurs through a cholestericlike twist of the molecules. A po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental and theoretical study of the nascent photoredox behavior of the aqueous hexachloroplatinate(IV) ionA. Goursot, A. D. Kirk, W. L. Waltz, G. B. Porter, and D. K. SharmaCite this: Inorg. Chem. 1987, 26, 1, 14–18Publication Date (Print):January 1, 1987Publication Hi…
The structure and phase diagram of Ti1−yVyHx (0≤y≤1.0, 0≤x≤2.0) have been studied by X-ray diffractometry at room temperature. The following crystallographic phases and their mixtures are identified and their phase boundaries are determined: α(hcp), β(bcc), γ(fcc), δ(fct) and ε(bct). One notable feature of this phase…