Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
Lattice distortions due to defects in crystals can be studied most directly by elastic X-ray or neutron scattering experiments. The size of the defects can be determined from the shift of the Bragg reflections. Defect induced diffuse scattering intensity close to and between Bragg reflections gives information on the…
Mössbauer data on the magnetic properties of Fe5SiB2 are presented and compared with measurements on Fe5PB2, Mn5PB2 and Mn5SiB2. The introduction of boron on the silicon position leads to an increase in the magnetic hyperfine field at neighbouring iron nuclei.
Measurements are reported on the effect of specimen size and filler content on the electrical-impulse strength of epoxy polymer. For unfilled polymer, the strength was found to decrease more rapidly with increasing thickness than with increasing area. But the incorporation of as little as 1 percent by volume of filler…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of nitrogen tribromide decomposition in aqueous solutionGuy W. Inman, Thomas F. LaPointe, and J. Donald. JohnsonCite this: Inorg. Chem. 1976, 15, 12, 3037–3042Publication Date (Print):December 1, 1976Publication History Published online1 May 2002Published inissue 1…
Magnetic interactions, categorised into ligand based, metal based and neutron diffraction, are reviewed with regard to the information they give on covalency. The ligand hyperfine interaction, the metal hyperfine field measured by the Mössbauer effect and neutron diffraction measurements are mentioned in some detail,…
A potters clay from the Gorgan plain, in N. E. Iran, has been fired successively at temperatures up to the melting point 1 200 °C in an atmosphere of air or 5 % CO in moist CO2. Mössbauer spectra at 296 K and 4.2 K allow the determination of the relative amounts of iron in well-crystallised haematite or magnetite, of…
Summary Chemical and mineralogical properties of brown podzolic soils, brown earths, a podzol, and an Andept have been studied with particular reference to the kinds and distribution of amorphous materials. In addition to pyrophosphate extractable (Fe + Al)/per cent clay, brown podzolic soils can be distinguished from…
Abstract Methanol was decomposed into hydrogen and carbon dioxide in the presence of water at atmospheric pressure over copper-containing mixed oxides, indicating that the reforming reaction CH3OH + H2O = CO2+ 3H2 proceeded to an appreciable extent. The mixed oxides were active and selective for the reforming reaction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman studies of macrocyclic complexes. 1. Structural and electronic effects in synthetic metal(II) porphyrin analogsWilliam H. Woodruff, Richard W. Pastor, and James C. DabrowiakCite this: J. Am. Chem. Soc. 1976, 98, 25, 7999–8006Publication Date (Print):December…