Materials Literature
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Foils made from pure iron with a porous structure were nitrided in mixtures of pure and entirely decomposed ammonia until constant weight was reached. The relationship between nitriding potential, temperature and concentration was measured in the ε region between 350 and 725°C and at concentrations between and . This…
The following new or updated patterns are submitted by the JCPDS Research Associateship at the National Bureau of Standards. The patterns are a continuation of the series of standard X-ray diffraction powder patterns published previously in the NBS Circular 539, the NBS Monograph 25, and in this journal. The methods o…
Abstract TL in sintered CaB4O7 doped with activators, such as Eu, Dy and also Pb and Cu, has been investigated. For a heating rate of 20 oC.min-1, the TL glow peaks can be roughly grouped into three temperature regions: (I) 75~110 oC, (II) 170~190 oC, and (III) 255~275 oC. Their emission spectra depend on the activato…
This paper presents a systematic and rational formulation of the electromagnetic theory of deformable and fluent bodies swept out by singular surfaces that may carry their own thermodynamics (interfaces). The treatment is based on the principle of virtual power for finite velocity fields, which is so formulated that,…
Abstract Regularly interstratified chlorite/smectite (corrensite) occurs as grain coatings in marine and eolian sandstones of the Permian Cutler Formation in Lisbon Valley, Utah. Corrensite dominates the <2- μ m clay size fraction along with lesser amounts of regularly interstratified illite/smectite in bleached, p…
An experiment has been undertaken to see if chemical sputtering of carbon can be directly observed under tokamak operating conditions. The test material consists of a well instrumented graphite probe limiter which can be heated up to 900°C under steady state conditions and up to >1200° C with additional plasma heating…
Abstract This paper begins with a brief description of the history of development of PVC plastisol. It, then, presents technical background on the nature of PVC plastisol, covering subjects of particle size distribution and nature of agglomerates, viscosity aging and deagglomeration, rheology of suspension, gelation a…
A summary of the bubble pulsation dynamics of an underwater explosion is presented with the aim of establishing the whipping response of a nearby surface ship. The effects of the initial shock front are not considered and the fluid is assumed to be an incompressible medium. The gas bubble volume dynamics can then be r…
We observe via freeze-fracture transmission electron microscopy the transition from the disklike micellar nematic phase to the lamellar smectic phase of decylammonium chloride-ammonium chloridewater as a function of temperature. We show direct visual evidence of the size and shape of the aggregates in the nematic phas…
Description de l'evolution de l'empilement cristallin sous contrainte. La temperature et la pression conduisent a une diminution des distances intra- et interstrates dans le rapport 1:1,5. Description de la mise en ordre de l'anion PF 6
Abstract Intercalates of Georgia well-crystallized kaolinite with formamide, N-methylformamide (NMF), and dimethylsulfoxide (DMSO) were prepared at room temperature by dispersing the clay in the organic liquid. Several physical and chemical properties of the intercalated organic molecules and the clay, while intercala…
Abstract Optically pure methyl, ethyl, isopropyl, and benzyl (R)‐malolactonate were prepared from (S)‐(‐)‐malic acid and were polymerized in the bulk with tetraethylammonium benzoate as the initiator to yield high‐molecular‐weight, crystalline polymers. The optical purity of methyl and benzyl malolactonate was determi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in nitroxyl biradicals bridged by metal-metal bonded complexes: structural, magnetochemical, and electronic spectral characterization of tetrakis(perfluorocarboxylato)dimetal(II) complexes of rhodium and molybdenum containing axially coordinate…
High-resolution measurements of the cubic refractive index (RI) of ${\mathrm{PbTiO}}_{3}$ reveal contributions due to the fluctuating polarization, which attains about 14% of the spontaneous polarization at ${T}_{c}$=769 K. In the tetragonal phase the anomalies of both RI's are shown to be negative with nearly equal a…
Abstract The crystal structure of a freibergite (Ag-tetrahedrite) from Keno Hill, Yukon, Canada, and a tetrahedrite from Turquetil Lake, NWT, Canada, have been refined. The freibergite, Cu 5.84 Ag 4.22 Fe 1.59 Zn 0.43 Sb 4.10 AS 0.13 S 13 , a = 10.610(2) Å, and the tetrahedrite, Cu 10.24 Fe 1.03 Zn 0.97 Ag 0.05 Sb 3.6…
Article The Processing of Thermoplastics Containing High Loadings of Long and Continuous Reinforcing Fibers was published on December 1, 1986 in the journal Journal of Polymer Engineering (volume 6, issue 1-4).
Abstract (R)‐(+) and (S)‐(‐)‐benzyl malolactonates were copolymerized anionically by using triethylamine and aluminum porphyrin as initiators. Configurational composition of resulting optically active poly(benzyl β‐malate) stereocopolymers depends on the enantiomeric purity in the monomer feed. Stereochemistry during…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and x-ray structure of the [HNi38(CO)42C6]5- cluster: an extended fragment of the Cr23C6 lattice stabilized in a molecular carbonyl nickel clusterAlessandro. Ceriotti, Anna. Fait, Giuliano. Longoni, Giampietro. Piro, Francesco. Demartin, Mario. Manassero, Norberto.…
Abstract The deuteron diffusion in acceptor‐doped barium titanate ceramics is studied as a function of the dopant concentration (0 to 1.0 mol% Ni) using a thermal desorption technique. The 0.1 mol% Ni‐doped sample shows a diffusion coefficient D = 290 cm 2 s −1 · exp(‐151 kj mol −1 / RT ). The dopant concentration has…
Abstract The surface free energy of Ca-montmorillonite has been determined from measurement of the contact angle of water on an oriented deposit immersed in n -alkanes; the oriented deposits were equilibrated at different relative humidities. These experiments provided the polar, γ S P , and dispersive, γ S D , compon…