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ABSTRACT The productivity of many wells has been seriously reduced in the pastbecause of scale deposition. In some fields, the produced water is saturatedwith gyp (calcium sulphate) that precipitates in the pores of the reservoirformation sand near the wellbore. Chemical treatments have successfullyrestored productivi…
I.r. and laser Raman spectra of 1 : 1 halogen and interhalogen adducts of dimethyl sulphide, selenide, and telluride, Me2YX2(Y = S, Se, or Te; X = halogen), have been recorded and interpreted in terms of a four-co-ordinate covalent structure of a trigonal bipyramidal type and a charge-transfer formulation of type Me2Y…
The Raman spectra of PCl5, SbCl5, NbCl5, TaCl5, MoCl5, NbBr5, and TaBr5 in the gas phase have been recorded. In all cases the data is consistent with the presence of five-co-ordinate trigonal bipyramidal species. The Raman spectra of gaseous PCl5, SbCl5, and MoCl5, show intersting temperature-dependent effects.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Kinetics of the Polymerization of PentafluorostyreneWilliam A. Pryor and Tzu-Lee HuangCite this: Macromolecules 1969, 2, 1, 70–77Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published inissue 1 January 1969https://pubs.acs.org/doi…
The compressive flow stresses of UO 2+x polycrystals and single crystals were measured between 900° and 16000°C. The stoichiometry was controlled by CO 2 /CO gas mixtures during the tests. The functional dependence of strength on stoichiometry was: image where C and m are constant at a constant temperature and 0.001 ≤…
The corrosion of pure magnesium in aqueous solutions of various p H has been studied. The reaction product is a porous layer consisting mainly of in the absence of inhibitors, but films formed in solutions containing are composed of substances which could not be identified. The reaction in inhibitor‐free solutions pro…
Four series of hexachloroantimonate(III,V) salts, AI2SbxSn1–xCl6(AI= NH4+, Cs+, and MeNH3+), and Cs2SbIIIy-InIII½–ySbV½Cl6 have been prepared and characterised by chemical analysis, X-ray powder diffraction, and far-i.r. measurements. Visible and u.v. spectra of all the compounds were measured at room temperature by d…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation N. Tovborg‐Jensen; NQR Investigation of Phase Transitions in Cesium Plumbochloride. J. Chem. Phys…
The anodic and cathodic behavior of titanium in sulfuric acid in the absence and presence of chloride ions have been investigated. Two stable corrosion potentials were observed. One was in the active region, the other in the passive region. Neither corrosion potential was appreciably affected by chloride ions or p H c…
A simple and relatively inexpensive technique is presented for determining the inplane shear stress-strain response of unidirectional composites. The method utilizes the stress-strain results from an uniaxial test on a ±45-deg laminate which is symmetrically laminated about the midplane. Through the use of relations d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSodium 6-niobo(ethylenediamine)cobaltate(III) and its chromate(III) analogCharles M. Flynn Jr. and Galen D. StuckyCite this: Inorg. Chem. 1969, 8, 1, 178–180Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published inissue 1 January 1969…
Abstract The techniques of oxygen-fugacity buffering have recently been applied to several ternary and quaternary systems for the purpose of studying the stability and extent of chromite spinel solid solutions. Examination of data at the subsolidus temperature of 1,300° C provides an insight into the phase relationshi…
Abstract A study has been carried out on block polymers of the A‐B‐A type, the thermoplastic elastomers, where A represents polystyrene and B polybutadiene or polyisoprene. The objective was to relate the mechanical properties of these elastomers to their molecular architecture. For this purpose a series of styrene‐bu…
A theoretical analysis of the electric-field distribution in the ionisation layer of a d.c. corona discharge under equivalent steady-state conditions is presented for both positive and negative polarities of the conductor. Using available experimental data on ionisation and attachment coefficients in air, the conditio…
Strong electric fields have been applied to dielectric polymer films to study field-induced mechanical stresses. For voltages near breakdown the mechanical forces are sufficient to cause localized deformation in some polymer films. Considerable field enhancement can occur at the deformation sites, leading to reduced n…
Abstract A transmission electron‐microscopy study of high‐angle grain boundaries has been made. When thin foils are cut in precisely oriented bicrystals of aluminium, some details of the grain‐boundary structure appear. Micrographs of symmetrical tilt boundaries around [001] show linear defects parallel to the tilt ax…
Zirconium diboride and hafnium diboride were fabricated by hot‐pressing at 1800°C and 120,000 psi. Bend strengths were measured on the fully dense materials from 25° to 1400° C in an argon atmosphere. These diboride compounds do not exhibit any gross plastic flow in the temperature range studied. The bend strengths go…
Abstract Coefficients of thermal expansion α‖ c and α ⊥ c between 4 and 800°K have been measured for zinc oxide using an interferometric and a capacitance method. Thermal properties of wurtzite lattices (two coefficients of thermal expansion and a pyroelectric constant) can be described in terms of three thermal equat…
In two possible symmetry sites exist for the Eu +3 ions, namely S 6 and C 2 . The emission spectrum is primarily due to ions but two additional lines are reported corresponding to emissions. The lines were identified by their long lifetime relative to the C 2 emission and represent the Stark splitting of the transitio…
Abstract Planare Komplexe, vor allem die des Platins, können Strukturen mit linearen Ketten von Schwermetallatomen mit Metall‐Metall‐Abständen bis herab zu 3,1 Å bilden. Die Bindung in derartigen Ketten läßt sich durch partielle Oxidation verstärken, wodurch die Abstände bis auf 2,8 Å verringert werden können. Dabei b…