Materials Literature
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The six terbium oxide phases whose compositions range between Tb2O3 and TbO2 have been prepared and their magnetic properties measured at temperatures from 1.4° to 300°K. The lower oxide phases (C and B polymorphs of Tb2O3, TbO1.715, TbO1.809, and TbO1.823) were prepared by equilibration at appropriate temperatures an…
Summary The concept of chemical potentials was used to study the solubility of phosphate in a calcareous soil when equilibrium was approached by precipitation. By comparison with results obtained by dissolution of soil phosphate it was demonstrated that precipitation resulted in a considerably greater solubility than…
The nuclear electric quadrupole coupling constant of 59Co in a single crystal of the racemic Co(en)3Cl3·3H2O was determined to be 2.63 Mc/sec from the splitting of the 59Co nuclear magnetic resonance spectrum. The sign of the coupling constant is probably negative from considerations of the contribution of the lattice…
Abstract Poly(vinyl alcohol) single crystal platelets having a stepheight of approximately 100 A. were obtained by isothermal crystallization from dilute triethylene glycol solution. Material crystallized at temperature T c redissolved in the same solvent at a higher temperature T s . A plot of T c versus T s gave a s…
Abstract The effect of small amounts (0.01%–1%) of dimethyl sulfoxide on base‐catalyzed polymerization and equilibration of methylsiloxanes has been examined. The addition of 0.5% of the sulfoxide increases the rate of potassium hydroxide‐catalyzed polymerization of octamethylcyclotetrasiloxane by factors of 100–1000…
A brief review of the ``state of the art'' with emphasis on developments of the past several years is given. It is shown that with but two major exceptions, all significant advancements in energy product enhancement have been achieved by special foundry techniques to promote crystal anisotropy, and not by alloy compos…
The compositional dependence of the magnetoelastic sensitivity of Permalloy films has been studied by a number of investigators, but their results are in disagreement regarding the compositions required for zero magnetostriction, the agreement with bulk values, and the anisotropy of the magnetoelastic coefficients. Th…
The 5000 series nonheat-treatable aluminum magnesium alloys are recognized as superior to other high-strength aluminum alloys for marine applications. However, a potential corrosion and stress corrosion hazard exists in these alloys from intergranular precipitation of a magnesium-aluminum compound. This paper summariz…
Neutron diffraction studies have been made of solid solutions of ferromagnetic CrTe and antiferromagnetic CrSb which crystallize in the hexagonal NiAs structure. Similarities are found with the isostructural system MnSb-CrSb, in which good agreement is obtained with de Gennes predictions for the effects of double exch…
Summary The mineralogy of the clay fraction from basaltic soils in the Galilee, Israel, has been studied by X‐ray and differential thermal analysis techniques, supplemented by electron‐micrographs and chemical determinations. The mineralogical composition of the clay was greatly influenced by the amount of rainfall. I…
Previous studies on copper ferrite report conflicting data as to the effect of quenching temperature on the transformation temperature. Data of the present study reveal that the reason for this disagreement has been insufficient attention to the influence of chemical stoichiometry. The transition temperature of copper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Incorporation of Magnesium(II) into Porphyrin1Stuart J. Baum and Robert A. PlaneCite this: J. Am. Chem. Soc. 1966, 88, 5, 910–913Publication Date (Print):March 1, 1966Publication History Published online1 May 2002Published inissue 1 March 1966https://pubs.acs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotropic Nuclear Magnetic Resonance Shifts in Tetrahedral Bispyridine and Bispicoline Complexes of Nickel(II)R. H. Holm, G. W. Everett Jr., and William DeW. Horrocks Jr.Cite this: J. Am. Chem. Soc. 1966, 88, 5, 1071–1073Publication Date (Print):March 1, 1966Publication Hist…
Abstract The solubility properties of poly(vinyl alcohol) (PVA) vary with the method of preparation of the poly(vinyl acetate) (PVAc) from which it is derived. PVAc was prepared with free‐radical catalysts over a range of temperatures from −78 to 90°C. with solvents of varying chain‐transfer ability. The corresponding…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal and Molecular Structure of Dimeric Bis(acetylacetonato)aquocobalt(II) and the Preparation of Some Other New HydratesF. A. Cotton and R. C. ElderCite this: Inorg. Chem. 1966, 5, 3, 423–429Publication Date (Print):March 1, 1966Publication History Published online1…
Abstract An attempt is made to explain the differently shaped bubbles observed growing on a surface during nucleate boiling of water. Some of the bubbles photographed were very close to the spherical shape, while others were close to the hemispherical. Also, a number of bubbles had intermediate shapes and were called…
Taylor found that the thermal conductivity, k t , of the transition metal carbides and nitrides increases with increasing temperature, T , at high temperatures. This behavior is different from that of metals, for which k t , is approximately independent of T , as noted by Taylor. It is proposed that defects cause the…
Saturation moments, Curie temperatures, and supporting crystallographic data are reported for a series of ferrimagnetic intermetallic compounds of the stoichiometry R2Co17, where R is any of the rare-earth elements Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, and Lu. The saturation moment of Y2Co17 is 27.2, that of Lu2C…
A liquid miscibility occurs within the Quaternary system, Na <sub>2</sub> O-Al <sub>2</sub> O <sub>3</sub> -SiO <sub>2</sub> -CO <sub>2</sub> between Na <sub>2</sub> CO <sub>3</sub> -rich liquids and NaAlSi <sub>3</sub> O <sub>8</sub> -rich liquids. The vapor-saturated liquidus surface does not intersect the miscibili…
The compound Mn3GaC has been found to have a crystal structure of the perovskite type and a ferromagnetic Curie point of 246°±2K°. At a lower temperature, about 150°K, it exhibits a rather abrupt transition to an antiferromagnetic state. At this transition, there is a rapid decrease of lattice parameter and of resisti…