Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Structures of Metal Cyanide-Lewis Acid Bridge CompoundsD. F. ShriverCite this: J. Am. Chem. Soc. 1963, 85, 10, 1405–1408Publication Date (Print):May 1, 1963Publication History Published online1 May 2002Published inissue 1 May 1963https://pubs.acs.org/doi/10.1…
Abstract A polybenzimidazole has been prepared from 3,3′‐diaminobenzidine and phthalic anhydride which has a high molecular weight and very good heat stability. Replacement of the hydrogen atoms on the nitrogen of the imidazole nuclei in a polybenzimidazole does not improve the heat stability as indicated by the prope…
fl-Pu is monoclinic body-centered with 34 atoms per unit cell. At 190 C a=9.284, b=10.463, c=7.859/~, fl=92.13 and the density is 17.70 g.cm. -3.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFertilizer Materials, Preparation and Characterization of Some Calcium PyrophosphatesE. H. Brown, J. R. Lehr, J. P. Smith, and A. W. FrazierCite this: J. Agric. Food Chem. 1963, 11, 3, 214–222Publication Date (Print):May 1, 1963Publication History Published online1 May 2002P…
Abstract Wakelin's method of correlation analysis of x‐ray diffraction patterns was adapted for fibers, films, and polymer samples of poly(ethylene terephthalate). This method gives a number called a crystallinity index, which is a measure of how far an unknown sample is between the extremes of the most amorphous and…
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…