Materials Literature
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12.5 μ thick zirconium foils were irradiated by monoenergetic electrons in the range 0.5–1.7 MeV at liquid helium temperature. To the measured defect production rate, a theoretical curve was fitted, assuming an atomic displacement probability function P d, (T) and estimating the multiple displacement contribution. The…
Abstract The dehydration of tohdite 5Al2O3·H2O is well followed by means of the single-crystal electron-diffraction patterns, the X-ray powder patterns, differential thermal analysis, and the measurement of the density. Thermogravimetric measurements were also performed, both under a normal atmosphere and in a high va…
Spectroscopic analysis of scattered x rays from Be irradiated by copper-target $K\ensuremath{\beta}$ radiation establishes the existence of a first-order bulk-plasmon line. Dispersion of the plasmon energy as a function of the scattering angle for momentum transfer $\ensuremath{\hbar}\stackrel{\ensuremath{\rightarrow}…
316 stainless steel has been irradiated with 5 MeV Cu ions to a fluence of 2 × 1016 ions/cm2 at 500°C. Transmission electron microscopy of this sample reveals that 6 × 1015 voids/cm2 of average diameter equal to 180 Å were produced. A method for correlating the fluence of ions with equivalent neutron fluences is descr…
Molybdenum, ranging in resistivity ratio (ρ293°K/ρ4·2°K) from 150 to 8000, has been neutron irradiated at 77°K and 473°K to integrated fission doses of ∼1020 n. cm−2 ∼7 × 1019 n. cm−2, respectively. A detailed electron microscope study has been made of the damage structures both before and after a post-irradiation ann…
The viscosity of a 0.60KNO 3 ‐0.40Ca(NO 3 ) 2 melt was measured from 10 9.6 to 10 14 P by a beam‐bending method. In this range, the viscosity exhibited Arrhenius behavior, with an activation enthalpy of 138 kcal/mol. These data joined smoothly with capillary and rotational viscometer data from 10 −2 to 10 8 P previous…
The complete amino acid sequence of chicken egg white avidin has been elucidated from sequence studies on 4 cyanogen bromide peptides and 15 tryptic peptides obtained from the protein. Avidin consists of four essentially identical polypeptide chains, each containing 128 amino acid residues with a carbohydrate moiety a…
The hydroxyproline-containing proteins (hyproproteins) synthesized by cultured human fibroblasts have been partially characterized. The hyproprotein extracted from the cell layer was found to be similar to the collagen extracted from skin in the ratio of hydroxyproline to proline, chain composition, solubility, and re…
On a fait des mesures de l'aimantation et de l'effet Mössbauer du 57Fe sur de faibles substitutions de fer dans du BaFe12O19 pour Al, Cr, ZnTi, ZnGe, ZnSn, ZnZr, CuTi, CoZr ou NiTi. Pour Al nos mesures affirment les conclusions de Bertaut e. a. : l'Al commence par remplir les sites 2 a, puis il entre dans les sites 12…
Abstract Messungen der Adsorptionskinetik und der Gleichgewichtsadsorption an Aktivkohle, der Oberflächenspannung und der Benetzung von hydrophoben Festkörpern mit Natriumdodecylsulfat und Octylphenolnonaglykoläther in wäßrigen Lösungen von N‐Methylacetamid, Fruktose und Xylose, zeigten folgende Ergebnisse: Bei der Gl…
Abstract The optical absorption in CdO single crystals is reported for photon energies just below the absorption edge (≈ 2.4 eV) at several temperatures between 80 and 300 °K. The investigation of the shape of the intrinsic absorption indicates the existence of an indirect gap. The influence of the higher concentratio…
The photoplastic effect in ZnO is observed as a strong reversible increase in flow stress, during illumination with white light, when single crystals are deformed in basal slip at room temperature. An earlier model based on Read's theory for the space-charge region near a charged dislocation has been confirmed by furt…
We review recent experiments showing that electrical conduction in transition ferromagnetics at low temperature is by two currents of spin ↑ and spin ↓ electrons in parallel, mixed by spin-non-conserving collisions when temperature increases. The relative values of transition impurity resistivities for spin "up" and s…
When a grain interior dislocation meets a grain boundary it can move along the latter by a mixture of climb and glide. Vacancies are then cmitted or absorbed and sliding is caused in amounts depending on the orientation of the dislocation's Burgers vector, which in turn depends on the grain orientation. The consequenc…
The heat capacities of Fe ${(\mathrm{HCOO})}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O and Ni${(\mathrm{HCOO})}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O have been measured between 1.4 and 20 \ifmmode^\circ\else\textdegree\fi{}K. Peaks associated with long-range spin o…
Magnetization measurements, between 2 and 850 °K, on RFe2, RFe3, R6Fe23 and R2Fe17 compounds, for R = Y, Lu or Gd, have confirmed their ferromagnetic (R = Y or Lu) or ferrimagnetic (R = Gd) character. The Lu2Fe17 compound shows a ferro-antiferromagnetic transition and a neutron diffraction study revealed an helical sp…
Optical-loss mechanisms and transmission losses were investigated in clad glass fibers and in the bulk glass from which they were drawn. Measurements of the total losses, absorption losses, and scattering losses in both the fibers and in the bulk materials are presented and compared. Photomicrographs of scattered ligh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectra and cis-trans isomerism in highly dipolar derivatives of azobenzeneGavriella Gabor and Ernst FischerCite this: J. Phys. Chem. 1971, 75, 4, 581–583Publication Date (Print):February 1, 1971Publication History Published online1 May 2002Published inissue 1 February 1971h…
Abstract On the base of Schuster-Kubelka-Munk's theory, quantitative relations between the bulk absorp tion and diffuse reflectance spectra of undiluted and diluted semiconductor powder samples are established in the region of the long-wave tail of the absorption edge. Investigations in the long wave region of the d…
Solid‐state substitution of Bi and Nb ions in the perovskite crystal structure of Pb(Ti 0.47 Zr 0.53 )O 3 was investigated by sample weight changes at 1150°C in an “equilibrium” PbO atmosphere. A model is discussed that includes the effect of charge neutralization, requiring weight losses for A‐site substitutions and…