Materials Literature
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The thermal decomposition of the [Ru(NH3)6]3+ complex ion exchanged in a NaY zeolite followed by reduction in H2 at 623 K leads to highly dispersed Ru metal in the zeolitic pore system. X-ray diffraction techniques have been used to identify atomically dispersed Ru0 inside the sodalite cavity at the site II′. This hig…
The transmission factors tabulated by Rouse, Cooper, York & Chakera [Acta Cryst. (1970). A26, 682-691] for μr < 1 can be expressed as the product of two factors: a scale factor and a Debye-Waller factor. In the case of a sphere or a cylinder, the absorption corrections then reduce to simple adjustments of these parame…
A study is made of the probability distribution of the end to end distance R of a polymer of N segments, length Nl=L, and of self repulsion ω. A simple method, capable of adoption in more complicated problems, is developed, using the idea of an effective step length.The mean square value of R2 is developed as a series…
Low chalcocite is monoclinic, space group P2Ifc, with a unit cell having a = 15.246(4)A, b = 11.884(2)A, c = 13.494(3) A, P = 116.35(1t, and containing 48 Cu2S. Its structure was solved by the symbolic addition method, using 5155 independent intensity data measured with MoKcx radiation on an automatic diffractometer.…
Surface analyses combined with barrier-height studies indicate that Cu2O Schottky barriers made with low-work-function metals (Yb, Mg, and Mn) are essentially Cu/Cu2O cells due to reduction of the Cu2O surface and subsequent interdiffusion phenomena. The copper-rich region essentially determines the barrier height. As…
The SYNROC process proposes to immobilize high-level wastes as dilute solid solutions (i.e. as integral parts of crystal lattices) in the constituent minerals of a synthetic rock formed from a mixture of oxides, principally, TiO2, BaO, ZrO2, Al2O3 and CaO. A new modification of SYNROC, comprising the titanate mineral…
The porphyrin photosensitizer, meso-Tetra (4-N-methylpyridyl) porphine tetraperchlorate binds to calf thymus DNA by intercalation and by external electrostatic association. This was concluded from the results of measruements involving Scatchard analysis, viscometry, thermal denaturation, and circular dichroism.
Abstract The electrical conductivities of dodecamolybdophosphoric acid H3Mo12PO40·29H2O and dodecatungstophosphoric acid H3W12PO40·29H2O crystals were measured. Remarkably high conductivities of 0.18 and 0.17 mho cm−1 at 25°C, and low activation energies of 15.5 and 13.7 kJ/mol were observed for the former and the lat…
The continuous development of the Geometrical Theory of Diffraction (GTD), from its conception in the 1950s, has now established it as a leading analytical technique in the prediction of high-frequency electromagnetic radiation and scattering phenomena. Consequently, there is an increasing demand for research workers…
In clastic situations, primary porositv is a direct function of texture and fabric, including size, sorting and shape (Fig. 1). Grain size, sorting, fabric, as well as sedimentary structures are related directly to sedimentary processes acting at the time of deposition (Fig. 1). Each depositional environment is charac…
Chapter 1 The Importance of Engineering Materials Chapter 2 Forming Engineering g Materials from the Elements Chapter 3 The Role of Chemical and Physical Properties in Engineering Materials Chapter 4 The Role of Mechanical Properties in Engineering Materials Chapter 5 The Role of Tribology in Engineering Materials Cha…
The factors contributing to hydride stability are discussed for a variety of metal hydride systems. The formation of a low-lying hydrogen associated state is a common feature. A significant transition metal character is also found in these states.
Based on accurate X-ray diffraction intensity data collected from spherically shaped single crystals, detailed electron-density distributions have been studied for synthetic mono-oxides, Mg0 (periclase), Mn0 (manganosite) , CoO, and Ni0 (bunsenite) . Mg0 (Sanger, 1969; Vidal-Valat and Vidal,1978) , MnO, and Coo have t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen-17 nuclear magnetic resonance spectroscopy of polyoxometalates. 1. Sensitivity and resolutionM. Filowitz, R. K. C. Ho, W. G. Klemperer, and W. ShumCite this: Inorg. Chem. 1979, 18, 1, 93–103Publication Date (Print):January 1, 1979Publication History Published online1…
When a smectic-$A$ phase is composed of chiral molecules, it exhibits an electroclinic effect, i.e., a direct coupling of molecular tilt to applied field. The pretransitional behavior of the electroclinic effect in the $A$ phase is used to study the critical behavior near the second-order, smectic-$A$---smectic-$C$ ph…
Tabulations are presented of relativistic Hartree-Fock atomic form factors F (x,Z), for values of x (=sin(ϑ/2)/λ from 0.01 to 109 Å−1, for all elements Z=1 to 100. For Z=1, F (x,Z) is given by the exact expression of Pirenne. For Z=2 to 98, x=0.01 to 2.0 Å−1, the tabulated values are those of Cromer and Waber given in…
"Corrosion Engineering." British Corrosion Journal, 14(1), p. 4
We develop a new theory of the spin-Peierls transition in spin-\textonehalf{} Heisenberg chains, treating the phonons in a mean-field random-phase approximation (RPA) as in previous work, but calculating the relevant response functions of the spin system using the procedure of Luther and Peschel. We show that the RPA…
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For staining myelin with silver a physical development technique has been devised that can render visible the thinnest fibers in various animal species, including fishes and reptiles, even in the early phase of myelination and may be applied to both frozen and embedded materials. Its principle is as follows: Myelin ca…