Materials Literature
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A thousand thermal cycles of vanadium hydride across the β-γ mixed phase region decreased the reversible hydrogen storage capacity and increased the absorption/desorption pressure hysteresis ratio. Thermal cycling also produced a large increase in hydride surface area. Nevertheless, X-ray diffraction and transmission…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeposition and characterization of polyimide Langmuir-Blodgett filmsKarl F. Schoch Jr., Wei Fang A. Su, and Mary Grace BurkeCite this: Langmuir 1993, 9, 1, 278–283Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 Januar…
The salts [Co(η6-C6Me6)2]+[A]–(A = BPh4, NbF6, PF6 or SbF6) have been prepared from anhydrous CoCl2. Solid-state magnetic susceptibility measurements on these salts indicate that they all obey the Curie–Weiss law in the temperature range 30–300 K with µeff= 2.7, 2.8, 2.8 and 2.6 µB with corresponding θ values of –1.4,…
An earlier paper showed that dezincification of [alpha]-brass could be monitored electrochemically by simulating the solution that would develop in an anodically polarized cavity and then carrying out a test in this solution at zero volts vs a copper reference electrode. A prediction made from the earlier work was tha…
Monohydrocalcite from Shiowakka occurs as a constituent of calcite-dominant sinter precipitated in cold (14.5-17.8°C) saline (Mg2+ ?? 4, 000mg/l, Cl- ?? 4, 000mg/1) spring water with pH=6.67 and Mg2+/Ca2+=0.64. The idiomorphs under SEM are trigonal bipyramid with (Ca0.979 Fe2+0.013Mg0.005(Na2)0.003) as the cationic co…
The structure of newly prepared LiCuM3O9(M = Nb, Ta) has been determined from the powder X-ray diffraction pattern. The Rietveld refinement confirms that the compounds adopt a distorted perovskite structure [a= 7.5286(1)Å with I23 space group for M = Nb and a= 7.5178(1)Å with Im for M = Ta], which is compatible with t…
The importance of studying the influence of accumulated surface charge on surface flashover is demonstrated by on-site trapped charge measurements. Using a hemispherically tipped electrode on an epoxy resin plate, it has been shown that, at a critical surface energy density, a back flashover can be induced when the DC…
The reaction of [Bu4N]3V5O14 with RC(CH2OH)3 in methanol yields red crystals of [Bu4N]2[V6O13(OMe)3{(OCH2)3CR}](R = Et, 1; R =- CH2OH, la), a Vv cluster with the common hexametallate core {V6O19}, and a green filtrate from which were isolated light-green crystals of a mixed valence cluster [Bu4N]2[V6O8{(OCH2)3CR}2{(OC…
Activities of Li in molten alloys were measured in EMF studies by means of cells of the following scheme :
The diffusivity and solubility of hydrogen and deuterium in polycrystalline α-yttrium have been measured in the temperature range 1073–1373 K. The ratios of the measured diffusion coefficient of deuterium to that of hydrogen showed the classical value 1/√2. The activation energy of diffusion has been found to be 510 m…
Preface. Acknowledgements. Glossary of terms. Introduction. Basic electroplating. Surface preparation for plating. Plating operation. Plating process control. Plating quality assurance. Corrosion. Properties of tin, lead and tin-lead alloy. Tin plating. Tin-lead alloy plating. Plating quality problems. Chemical analys…
For the melting of scrap metal in baths with a high carbon content, in which the melting temperature lies below the bath temperature, a model is being developed which is based on the coupling of mass and heat transfer. It will be shown that the mass transport determines the melting rate only for very low bath temperat…
Intermediates produced in the carbonation process of a Ca(OH)2 slurry were analysed by X-ray photoelectron spectroscopy (XPS). The molar ratios of CO32- to Ca2+ of the intermediates, determined from the peak areas of Ca2p and Cls of XPS spectra, indicated that the rate of carbonation in the vicinity of the surface was…
The title compound is prepared as a higher homologue in an extensively conjugated series of TCNQ (7,7,8,8-tetracyanoquinodimethane) and TNAP (9,9,10,10-tetracyano-2,6-naphthoquinodimethane); its complexes with TTT (tetrathiatetracene) and HMTTeF (hexamethylenetetratellurafulvalene) are electrically highly conductive.
SUMMARYThe term corrosion covers a wide variety of types of surface attack and mechanism. Broadly, these may be subdivided into two categories, those associated mainly with the metal and those with the environment. In this second paper, typical cases of localised corrosion are outlined and are illustrated by examples,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry and catalysis with vitamin B12 hexacarboxylate in an insoluble surfactant filmChang Ling Miaw, Naifei Hu, James M. Bobbitt, Zhenkun Ma, Maryam F. Ahmadi, and James F. RuslingCite this: Langmuir 1993, 9, 1, 315–322Publication Date (Print):January 1, 1993Publi…
It is demonstrated that a number of the conclusions drawn by Singh, Ramaswamy and Suryanaryana (1992) in an investigation of the texture development in rolled austenitic steel are in direct contravention of various recent observations on the texture development in brass by the present author and coworkers. And it is d…
When pyrophyllite was subjected to mechanical treatment by dry grinding, the alteration was greater along the c axis of its structure because reflections from basal planes (00 l ) disappeared well before those from nonbasal planes, producing anisotropic X‐ray line broadening observed on grinding. X‐ray analysis showed…
The particular phase in which a liquid crystal system will exist is that which has the lowest free energy at a certain temperature. The free energy may depend on variables such as temperature, pressure, chirality, etc. One way in which the stability of a particular thermodynamic phase, relative to its neighbours, woul…
When HF / H 2 O vapor derived from an azeotropic solution of HF / H 2 O was used to etch various oxides of silicon, the etch rates were found to have qualitatively similar dependence on the wafer temperature. However, the sensitivites of the dependence were found to vary greatly among the different oxides. Consequentl…