Materials Literature
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The absorption and fluorescence spectra of Eu3+ in LaCl3 were obtained and analyzed. Crystal-field calculations give good agreement with the observed Stark components for B20 = A20〈r2〉 = 89 cm—1, B40 = —38 cm—1, B60 = —51 cm—1, and B66 = 495 cm—1.
A deformation field due to a moving single dislocation is expressed by line integrals along the dislocation line. Proper definitions for a continuous distribution of moving dislocations and its velocities enable us to extend the expression for the deformation field due to a single dislocation, to the deformation field…
Free-ion energy-level schemes for the 4f6 and 4f8 configurations of Eu3+, Sm2+, and Tb3+ are given, which have been calculated from energy matrices including interactions among the three highest multiplicities. The values obtained for the parameters are F2 = 401 cm—1, ζ = 1320 cm—1 for Eu3+; F2 = 330 cm—1, ζ = 1050 cm…
The Obreimov—Gilman cleavage technique has been used to study, in a quantitative manner, the effects of a mercury environment on the cleavage fracture energy of high purity zinc monocrystals. The experimental observations support the view that the total energy involved in the propagation of a crack, Φ, can be convenie…
Electron spin resonance of acceptors due to substitutional Li, and the resonance of certain donors previously reported at $g\ensuremath{\cong}1.96$ were examined using polycrystalline samples of ZnO. It was found that the latter signal could actually be a superposition of two independent signals, one arising from the…
The slip systems observed in a number of crystal structures common amongst metals and simple ceramic materials are examined to see whether they allow the crystal to undergo an arbitrary strain without change of volume. For most materials, other than f.c.c. and b.c.c. metals, there are insufficient independent slip sys…
Abstract A theory is developed to account for the restricted swelling in solvents of crosslinked elastomers containing reinforcing fillers. Assuming swelling to be completely restricted at the filler‐rubber interface due to adhesion, the following relation is obtained: where v r is the volume fraction of rubber in the…
"Radiation Chemistry of Polymeric Systems." Nuclear Science and Engineering, 16(1), pp. 144–145
X-ray diffraction and dilation studies have shown that alloys near the stoichiometric TiNi composition undergo transformation into the related phases Ti2Ni and TiNi3 at low temperatures. The main factors controlling these phase transformations are alloy composition, temperature, and mode of plastic deformation. In pla…
CONTENTS I. Introduction 201 II. Monobasic carboxylic acids and their salts 201 III. Polybasic carboxylic acids and their compounds with metals 202 IV. Halogenated acids and their salts 203 V. Ethylenediaminetetraacetic acid and its compounds with metals 203 VI. Amino-acids and their compounds with metals 204 VII. Hyd…
Glauconite from the upper part of the Missoula Group of the Belt Series, Flathead County, Montana, has been dated at 1070 million years by potassium-argon and rubidium-strontium analyses. This is the first glauconite of Precambrian age reported in North America.
Abstract The black film (50 to 100 A thick) has a simple lamellar structure in which two monolayers of surface-active molecules are spread on a thin aqueous core. The thickness of the film surface layers has been estimated from the simultaneous measurement of the total film thickness and the thickness of the aqueous c…
Relaxation-time measurements by observation of the recovery of the $z$ component of the dc magnetization have been carried out in ruby. Harmonic cross-relaxation processes, involving two, four, and five spins, have been identified. The cross-relaxation time for the five-spin process is found to be proportional to ${f}…
Measurements of the spin-lattice relaxation time ${T}_{1}$ by the inversion-recovery technique are reported for two paramagnetic centers in quartz over a wide temperature range: from 1.3 to 250\ifmmode^\circ\else\textdegree\fi{}K for the ${{E}_{1}}^{\ensuremath{'}}$ center, and from 2 to 80\ifmmode^\circ\else\textdegr…
Sharp-line fluorescence of the ${\mathrm{V}}^{2+}$ ion in magnesium oxide and corundum has been studied at low temperatures, with and without a magnetic field. The excitation spectrum is used to determine the energy level scheme. The results are analyzed in terms of crystal field theory, and the vibrational structure…
For the ${(\mathrm{N}\mathrm{i}{\mathrm{F}}_{6})}^{4\ensuremath{-}}$ complex in KNi${\mathrm{F}}_{3}$ we have constructed molecular orbitals (MO) which are linear combinations of the ${\mathrm{Ni}}^{2+}$ and ${\mathrm{F}}^{\ensuremath{-}}$ Hartree-Fock atomic orbitals. These LCAO-MO, introduced by Van Vleck, are of th…
The three magnetic states which occur in the Cr-modified ${\mathrm{Mn}}_{2}$Sb system have been studied by measurements of magnetization, torque, and x-ray lattice cell dimension on single crystals. The exchange inversion transitions between magnetic states for a given composition are shown by x ray to be first order.…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation N. E. Wolff, R. J. Pressley; OPTICAL MASER ACTION IN An Eu+3‐CONTAINING ORGANIC MATRIX. Appl. Phy…
The fusion curves of several elements and III-V compounds crystallizing in the diamond/zincblende structure have been determined to 50, or sometimes 70, kbar by means of differential thermal analysis. The melting slopes are (in \ifmmode^\circ\else\textdegree\fi{}C/kbar); Si, -5.8 (lower bound); Ge, -3.8; InAs, -4.3; G…
A pattern of attack, qualitatively similar to groove pitting of irradiated fuel cladding, was produced in the laboratory. The relative susceptibility to attack of X-8001 alloy aluminum in comparison to 1245 alloy aluminum is in agreement with reactor experience. The remaining readily recognizable feature of in-reactor…