Materials Literature
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By ’’photodoping’’ with silver, chalcogenide glasses become almost insoluble in alkaline solutions. This letter examines the applicability of this effect to silicon microfabrication technology. Suitable processing techniques and exposure characteristics are investigated. It is shown that the (Ag) -Se-Ge glass system c…
An interaction between chiral molecules is derived in terms of the orientations of their long molecular principal axes. In analogy with Maier–Saupe and Goossens the derivation is based on the electric multipole expansion. The molecules are assumed to behave as if they were cylindrically symmetric, i.e., the system is…
The Prigogine–Defay ratio, Π≡ΔCp Δκ/TV (Δα)2, has been derived for systems whose states need to be specified in terms of a number of order parameters z by considering the conditions of tangency of the equilibrium free energy surface and the free energy surface for constant values of the order parameters. It is shown t…
We describe in detail a new method for solving the coupled linear differential equations which appear in the theoretical statement of many types of scattering phenomena. Combining the speed advantage of propagation methods with the inherent stability of R-matrix methods, this method is fast and is unaffected by expone…
Some aspects of phase transition behavior have been studied for a classical system of particles which interact in pairs via repelling Gaussian potentials. In a specific low-temperature, low-density limit, this model acts as though it were composed of rigid spheres. Study of lattice sums suggests that at T=0, a fcc cry…
Neutron-diffraction studies of ${\mathrm{TiSe}}_{2}$ show that a second-order structural phase transition occurs at ${T}_{0}=202$ K involving transverse atomic displacements with wave vector $\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}}=(\frac{1}{2},0,\frac{1}{2})$. The electronic transport properties of the most n…
The spectra of ejected electrons following the excitation or ionization by 2 keV electrons in the outermost np shell of Ca (n=3) and Sr (n=4) have been measured with high resolution. Binding energies of the np 1/2 and np 3/2 electrons as well as the excitation energies of np 5 (n+1)s 2 nd 1 P levels of Ca and Sr have…
Rates of linear crystal growth have been measured for diopside and anorthite growing from their own melts by using a microscope heating stage. Rates were obtained for undercoolings of as little as 13°C. The rates are higher for diopside than for anorthite. Maximum growth rates observed are 1.5×10−2 cm/s (ΔT = 194°C) f…
Substrate core chemical shifts upon chemisorption of oxygen on aluminum are observed using variable-excitation-energy photoelectron spectroscopy. At low exposures a unique intermediate oxidation state evolves where the $\mathrm{Al} 2p$ level is shifted by only 1.3 eV toward higher binding energy as compared to the 2.6…
High-angle x-ray diffraction provides direct evidence that amianthoid change, occurring during aging of costal cartilage, corresponds to a transformation from an isotropic to a marked anisotropic distribution of collagen fibrils. Low-angle x-ray diffraction and electron microscopy show that the fibrils have the custom…
Formal expressions are derived for the effective thermal conductivity K ij of randomly dispersed suspensions undergoing shear. These are then evaluated for the cases of dilute suspensions of cylinders and of spheres when the bulk motion is a simple shear, the Péclet number Pe is large, and the particle Reynolds number…
Abstract The crystal structure of (1,1′‐ferrocenediyl)diphenylsilane has been determined from analysis of photographic X‐ray data. The crystal system is orthorhombic, a = 14.18(2), b = 12.54(2), c = 9.28(1) Å, space group P nma with four formula units. The molecule has crystallographic m (C s ) symmetry with atoms Fe…
Results of a detailed investigation of the internal quality and mechanical properties of electroslag remelted 2 1/4 percent Cr-1 percent Mo steel are presented. Superiority over air melted-vacuum degassed electric furnace product in terms of homogeneity and cleanliness is evident. This quality enhancement is reflected…
To help elucidate some of the properties associated with the permanent magnetism of Sm1Co5, an experimental investigatlon was made of the magnetic and crystallographic characteristics of the tertiary alloys Sm.9z.1Co5where Z represents various selected elements other than rare earths or magnetic transition elements, t…
Abstract The kinetics of the cationic ring‐opening polymerization of propylene sulfide initiated with different initiators has been investigated and the results were compared with those obtained with triethyloxonium tetrafluoroborate as described in a previous paper. With triethyloxonium hexafluorophosphate, the polym…
The thermal conductivity of deformed crystals of bismuth and its dilute alloys has been measured as a function of temperature from 1.5 to 20 K. Most crystals were deformed by compression so as to cause slip on the glide systems (111)[10\bar1] and (001)[1\bar10]. The other crystals were deformed by rapid compression or…
Sm(Co0.08Cu0.13)zalloys were prepared with7.2 \leq z < 8. Homogenization heat-treatment yielded single phase 2-17 material forz > 7.2. Forz = 7.8some of the Co was substituted by Fe. The alloys remained single phase for up to 15 % Co substituted. With further increasing Fe content a Co-Fe phase appears accompani…
Abstract The Red Latosols of Sri Lanka have developed on the Quaternary Red Earth Formation into very deep, excessively drained soils with weak horizon differentiation. The three major soil series of this subgroup, the Gambura, Mullaitivu and Wilpattu series, were studied from the point of view of their morphological…
The whole-particle crushing strengths of high-temperature gas-cooled reactor fertile and fissile coated particles were measured and correlated with fabrication procedures. The crushing strength of Biso-coated fertile particles was increased by the following factors:Increasing the outer coating thickness by 10 µm incre…
This paper offers a numerical approach to the determination of the magnetic field distribution, in a semi-infinite space, filled with conductive ferromagnetic materiaI. Simple mathematical functions are used to simulate the saturation and hysteresis characteristics of a given material. The case of a sinusoidal magneti…