Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Metal-Metal Bonded, Polynuclear Complex Anion in CsReCl4J. A. Bertrand, F. A. Cotton, and W. A. DollaseCite this: J. Am. Chem. Soc. 1963, 85, 9, 1349–1350Publication Date (Print):May 1, 1963Publication History Published online1 May 2002Published inissue 1 May 1963https:/…
Abstract Sheets of isotactic polypropylene were prepared to have initially random orientation and were subsequently rolled at temperatures below the crystalline melting point. Their crystal orientation was investigated. The orientation of the c axis (fiber axis) was determined from pole figure data obtained by x‐ray d…
The effects of additions of La 2 O 3 and La 2 O 3 ‐3TiO 2 on the electronic properties of barium titanate have been investigated. It has been found that small additions of these components markedly increase the lifetime of this material subjected to dc fields of 50 v per mil at 200°C.
Dielectric measurements, analyzed in terms of the Maxwell‐Wagner‐Sillars theories of inhomogeneous dielectrics, have been used to investigate the phase‐separation characteristics of various lithium silicate glasses. Such measurements are shown to provide evidence of the continuous or discontinuous nature of separated…
Measurements of the magnetoelectric effect on ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ powders, after magnetoelectric annealing are described. The experimental results are compared with theoretically derived relations between the magnetoelectric effect in single crystals and powders. Reasonable agreement is found.
The crystal structure of sillimanite, Al2SiO5, has been refined as part of a detailed structural study of the aluminum-silicate minerals. Three-dimensional least-squares refinement reduced the disagreement factor, R, for 347 hkl reflections to 5.6%.
The vacuum-ultraviolet reflectance of freshly evaporated aluminum films has been measured as a function of time in vacuum after the deposition. The pressure in the experimental chamber during the measurements ranged from 4 × 10−6 mm Hg at the time of the deposition to an ultimate pressure of 2 × 10−7 mm Hg. The first…
Abstract The release of K from K‐Ca‐illites by repeated extraction with 0.5 N solutions of various salts was determined. From comparison between the action of NH 4 ions and Na ions it could be deduced that the rapidly exchangeable K occupies two types of sites, which were named “planar” sites and “edge‐interlattice” s…
Summary Based on earlier theories of mechanical, electrical and magnetic relaxation phenomena, the paper discusses a simple mathematical model representing qualitatively the basic characteristics of “internal” damping in solid materials. The model is assessed with respect to variation with frequency of stiffness and l…
Experimental work on nickel films is presented which verifies the theory that the dc voltages accompanying ferromagnetic resonance in thin metallic films arise from the nonlinear electrical conduction terms in ferromagnetics involving the extraordinary Hall effect and the magnetoresistive anisotropy. Each of a group o…
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…