Materials Literature
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Experimental findings are presented for the effect of microstructure on the room‐temperature transverse bend strength properties of hot‐pressed dense pure alumina and magnesia. Bend strength shows an exponential dependence on porosity but is sensitive to fabricating temperatures because of changes in grain size. Log‐l…
Curves of thermal expansion parallel and perpendicular to the polar axis are shown for poled barium titanate and lead titanate zirconate ceramics. Anistropy is remarkably higher in the latter due to greater alignment by 90° switching during poling. The anisotropy disappears after heating through the Curie point, and i…
A magnesium deuteride preparation of composition Mg(D0.gH0.1) 2 is found to be tetragonal with a=4.5025, c=3.0123/~.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effect of Fluorine Substitution on the Electronic Properties of Alkoxy, Alkylthio and Alkylsulfonyl GroupsWilliam A. SheppardCite this: J. Am. Chem. Soc. 1963, 85, 9, 1314–1318Publication Date (Print):May 1, 1963Publication History Published online1 May 2002Published ini…
Magnetocrystalline anisotropy was measured for Mn-Zn-Fe ternary ferrites from liquid oxygen temperature to the Curie point by means of torque magnetometer, using a number of monocrystals. Anisotropy constant K 1 increases monotonically from that of the pure Mn ferrite with the increase of the content of ZnO. On the ot…
Abstract Heat treatment of butyl rubber containing carbon black can considerably reduce “structure effects” in the dynamic properties of the vulcanizate, although swelling measurements indicate that G ∞ the shear modulus at very high amplitudes is unaltered. This paper compares the G ′, G ″ and phase angle δ changes t…
The absorption and fluorescence spectra of Tb3+ in LaCl3 have been used to find the levels of Tb3+. All Stark components of 7F and 5D4 were unambiguously established. The classification of the higher levels is still doubtful. The analysis was helped by Zeeman effects and particularly crystal field calculations. The la…
The elastic moduli of both single crystal and polycrystalline magnesia were determined in the kcps frequency range by a Forster-type resonance method. The values obtained at 25°C for single crystal are: c 11 = 28•92c 12 = 8•79 and c 44 = 15•46 × 1011 dynes per cm2. The calculated isotropic elastic moduli for polycryst…
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…