Materials Literature
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The first analysis of a problem in cavitation and bubble dynamics was made by Rayleigh (1917), who solved the problem of the collapse of an empty cavity in a large mass of liquid. Rayleigh also considered in this same paper the problem of a gas-filled cavity under the assumption that the gas undergoes isothermal com…
DEFORMATION OF ENGINEERING MATERIALS. Tensile Response of Materials. Elements of Dislocation Theory. Slip and Twinning in Crystalline Solids. Strengthening Mechanisms in Metals. High-Temperature Deformation Response of Crystalline Solids. Deformation Response of Engineering Plastics. FRACTURE MECHANICS OF ENGINEERING…
Data on the catalytic properties of various substances (metals, their alloys, simple and complex oxides, and zeolites containing metal cations) in the oxidation of ammonia are described systematically and reviewed. The kinetics and mechanism of the reaction are discussed and the factors determining the activity and se…
Abstract An atomistic study of the motion of the 1/2 [111] screw dislocation was carried out for a shear stress applied on {112} planes and for uniaxial stresses along [012], [001] and [111]. Central force interactions described by the three different empirical potentials used in the previous work (Duesbery, Vitek &am…
The electrical conductivity of some nickel-zinc ferrites is studied as a function of temperature. The ferrites with iron in excess show n-type conduction and those with iron in deficiency show p-type conduction. Seebeck coefficient, X-ray analysis, and saturation magnetisation are also carried out to discuss the condu…
The acoustic emission during tensile tests is investigated for several types of aluminium alloys. It is found that the mean square amplitude of the continuous emission is proportional to strain rate and sample length. It is assumed that the continuous emission is generated by dislocation loops, which are created conti…
A computer simulation is carried out to study the motion of a magnetic domain wall through a random array of obstacles. The coercive field and the initial susceptibility are determined as a function of the defect density, the interaction force, and of the area and rigidity of the domain wall. For weakly interacting de…
NiMnGe is investigated by means of X-ray diffraction, neutron diffraction, and magnetometric methods. The orthorhombic distorsion of hexagonal lattice is observed below 470 K. The compound NiMnGe is antiferromagnetic with a Néel temperature TN = 346 K. The jump observed at temperature Tt = 185 K on the temperature dep…
Polarized infrared reflectivity measurements of PbW${\mathrm{O}}_{4}$ were made from 45 to 4000 ${\mathrm{cm}}^{\ensuremath{-}1}$ at 300\ifmmode^\circ\else\textdegree\fi{}K, and from 220 to 4000 ${\mathrm{cm}}^{\ensuremath{-}1}$ at 100\ifmmode^\circ\else\textdegree\fi{}K. Raman spectra were also obtained at 300\ifmmod…
Anomalous $S$-shaped deviations from Vegard's law in some semiconductor alloys are attributed to the effect of bond-bending forces. This idea is substantiated by numerical calculations on two-dimensional model alloys. A criterion is found which separates the occurrence of usually observed concave bowing and $S$-shaped…
The directional anisotropy in photoemission from valence bands of Cu and Au single crystals has been studied in the photon energy ranges $32\ensuremath{\le}h\ensuremath{\nu}\ensuremath{\le}200$ eV, and $32\ensuremath{\le}h\ensuremath{\nu}\ensuremath{\le}130$ eV, respectively. Angle-resolved photoemission energy distri…
A sum rule is derived which is useful for verifying the accuracy of calculated optical properties of arbitrarily shaped particles or powders.Received 7 June 1976DOI:https://doi.org/10.1103/PhysRevB.14.5521©1976 American Physical Society
The hyperfine interaction parameters at the iodine site in various metal diiodides (M=V, Cr, Mn, Fe, Co, Ni, and Cd) were measured using the 27.8 keV Mössbauer transition in 129I. Charge densities in the valence orbitals are deduced from an interpretation of isomer shift and quadrupole coupling constant values. Magnet…
The interlayer binding energy of hexagonal molybdenum disulfide at 0 K was calculated employing an exponential-six potential function summed over all sulfur neighbors across the interlayer gap. A rigid-layer, two-dimensional lattice model was assumed. Experimental values of the equilibrium lattice constants, the latti…
EPR measurements of the ground state g-values of Co 2+ ions at sites of trigonal symmetry in CdCl 2 , CdBr 2 , CsCdCl 3 , MgCl 2 and K 4 CdCl 6 are reported. Two distinct axial EPR spectra are observed in CsCdCl 3 , corresponding to the two crystallographically inequivalent Cd 2+ sites. In the case of K 4 CdCl 6 one a…
Analysis of the diffuse x-ray scattering in the one-dimensional ionic conductor ${\mathrm{K}}_{1.54}$-${\mathrm{Mg}}_{0.77}$ ${\mathrm{Ti}}_{7.23}$ ${\mathrm{O}}_{16}$ (hollandite) yields a detailed microscopic picture of the cationic shortrange order. This order is characterized by large shifts of some ions off their…
X-ray photoemission spectra of W core levels and valence band in transparent and in situ uv-colored amorphous W${\mathrm{O}}_{3}$ films show that coloration is related to the existence of occupied electronic ${\mathrm{W}}^{5+}$ states situated \ensuremath{\sim}2 eV above the valence band and localized on some tungsten…
Chemical, optical and X-ray data are reported for an Fe-end-member phosphophyllite from Potosi, Bolivia. The unit cell is monoclinic P21/c, a = 10.378 (3), b = 5.084 (1), c = 10.553 (3) Å, β = 121.14(2)°, Z=2. Refractive indices (±0.0002) for Na light are α = 1.5994, β = 1.6167, γ = 1.6198, 2Vx = 44.3 (4)°
Abstract Blends of soap and surfactants that possess good lime soap dispersing properties were dispersed in hard water. The turbidity of such dispersions varied depending on the type of dispersant used and also on the soap:dispersant ratio. Differences in coarseness of various dispersions could be measured empirically…
1-(2-Pyridylazo)-2-phenanthrol forms two distinct complexes with cobalt(II). Isolation from ethanolic medium yields green coloured CoL2, · 4C2 HSOH, which shows antiferromagnetic interaction between cobalt(H) ions of S=1/2 (J=49 cm−1). The green coloured complex dissolves in chloroform to give a pink solution yielding…