The structure of the δ phase in the uranium–zirconium system
The delta phase of the U--Zr alloy was found to be primitive hexagonal with c = 3.0B and a = 5.03 A and with a composition UZr/sub 2/.(W.L.H.)
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Buckling at High Temperature
Summary High temperatures affect buckling because the properties of the materials change and because thermal stresses and creep develop. A survey is given of the known solutions of problems arising in consequence of these phenomena and new theories of the creep buckling of columns and of thin circular cylindrical shel…
Study of Phase Transitions in WO3 with a High-Temperature X-Ray Diffractometer
WO3 undergoes a phase transformation from monoclinic to orthorhombic at approximately 320°C and from orthorhombic to tetragonal at 720°C. A detailed study of the variation of the unit cell dimensions over the range from room temperature to 1000°C has been carried out using high-temperature x-ray diffraction techniques…
Studies on Some Infrared Stimulable Phosphors
Physical properties of the two phosphor systems SrS: Ce,Sm, and SrS: Eu,Sm, as well as the base material SrS, have been studied. The optical studies concern spectra of transmission, excitation, fluorescence, phosphorescence, stimulation, and stimulated emission. Relative storage efficiencies of the major exciting wave…
Chelate Compounds of Nickel(II) with Picolinic Acid
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChelate Compounds of Nickel(II) with Picolinic AcidR. W. GreenCite this: J. Am. Chem. Soc. 1957, 79, 21, 5608–5611Publication Date (Print):November 1, 1957Publication History Published online1 May 2002Published inissue 1 November 1957https://pubs.acs.org/doi/10.1021/ja01578a…
The Vulcanization of Rubber with Sulfur
Abstract E. H. Farmer compiled a review of vulcanization which was published in 1946 as an important chapter in Volume II of “Advances in Colloid Science”. About two years later, Normann Bergem published a review under the same title. These authors dealt with the subject from rather fundamental points of view, but, be…
Investigation of Transport Phenomena in the Cryolite-Alumina System by Means of Radioactive Tracers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of Transport Phenomena in the Cryolite-Alumina System by Means of Radioactive TracersWilliam B. Frank and L. M. FosterCite this: J. Phys. Chem. 1957, 61, 11, 1531–1536Publication Date (Print):November 1, 1957Publication History Published online1 May 2002Publish…
Extraction of Potassium from Soils by Sulfuric Acid
Abstract Methods of extracting potassium from soils by use of sulfuric acid have been developed. The amounts of K extracted from several Ohio and New York soils by these methods were compared with those extracted by neutral 1 N NH 4 OAc and boiling 1 N HNO 3 methods as means of furnishing a reliable index to the “plan…
The crystallographic, elastic and piezoelectric properties of ammonium pentaborate and potassium pentaborate
Therefore it appears that purely 'mechanical' forces do not appreciably affect bond length, whereas bond angles are not as rigorous in their demands for constancy.
Phase Equilibria in the System BaTiO 3 –SrTiO 3
Phase equilibria in the binary system BaTiO 3 –SrTiO 3 were studied above 1200°C. This system is characterized by a complete series of solid solutions with a minimum at 2.5 mole % SrTiO 3 and 1585°C. The hexagonal BaTiO 3 phase is suppressed to a region extending no farther than 0.5% SrTiO 3 at 1600°C. No immiscibilit…
Preparation and Use of Snake-Cage Polyelectrolytes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Use of Snake-Cage PolyelectrolytesMelvin J. Hatch, John A. Dillon, and Hugh B. SmithCite this: Ind. Eng. Chem. 1957, 49, 11, 1812–1819Publication Date (Print):November 1, 1957Publication History Published online1 May 2002Published inissue 1 November 1957https…
Carboxylic Elastomers
Abstract The degree to which a polymer is rubbery is influenced by the detailed shape and chemical composition of the macromolecules. Polymers which are rubbery possess relatively weak interchain forces and may lack linear symmetry and orderly arrangement of the molecule. As stronger interchain forces are added and sy…
NUCLEAR MAGNETIC RESONANCE MEASUREMENTS IN SOLUTIONS OF ACETYLACETONE: THE EFFECT OF SOLVENT INTERACTIONS ON THE TAUTOMERIC EQUILIBRIUM
A modified assignment of the PMR signals in acetylacetone is confirmed. The changes in intensity of selected signals with temperature are used to calculate an enthalpy of conversion of 2700 ± 100 cal. between keto and enol forms in pure acetylacetone.Interactions, which perturb the equilibrium between the tautomeric f…
Separation of Xylenes, Cymenes, Methylnaphthalenes and Other Isomers by Clathration with Inorganic Complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation of Xylenes, Cymenes, Methylnaphthalenes and Other Isomers by Clathration with Inorganic ComplexesWilliam D. Schaeffer, W. S. Dorsey, Davis A. Skinner, and C. G. ChristianCite this: J. Am. Chem. Soc. 1957, 79, 22, 5870–5876Publication Date (Print):November 1, 1957P…
Reflection of X-Rays from Condensed Metal Films*†
The results of a series of measurements on the x-ray reflectivity of metal films evaporated on a glass substrate are presented. Comparison of these results with theory is made and the necessity of making measurements on bulk material is pointed out if the disagreements with theory are to be eliminated.
THE SOLUBILITY OF MALACHITE
The solubility at 25 °C. of the sparingly soluble basic copper carbonate malachite has been determined by two methods. The constancy of the calculated value of the solubility product in solutions of varying ionic strength has shown it to be a comparatively well-defined material suitable for the study of the complexing…
Aging and Oxidation of Elastomers
Abstract Natural rubber and synthetic elastomers deteriorate on aging as a result of the contribution of a number of factors. It has been generally recognized for many years that the changes in properties on aging are due primarily to the deteriorating effects of one or more of the following factors: heat, light, oxyg…
The Chemistry of Carbon Black and Reinforcement
Abstract In this discussion, we have indicated that carbon blacks display both chemical and catalytic activity which appear to be sufficient to radically alter the chemistry of vulcanization. Much of the chemical reactivity results in removal of molecules or reactive intermediates which might otherwise produce crossli…
Marine Algae of the Northeastern Coast of North America
Journal Article Marine Algae of the Northeastern Coast of North America Get access Marine Algae of the Northeastern Coast of North America . Taylor William Randolph . 509 pgs., illus. The University of Michigan Press , Ann Arbor, Michigan ( 1957 ) $12.50 Harold C. Bold Harold C. Bold University of Texas Search for oth…
Focusing in Collision Problems in Solids
In treating problems of sputtering and radiation damage of solids, a billiard ball model is frequently assumed. An attempt is made to indicate to what extent such a model is justified. Using this model it is noted that the lattice structure of a crystal implies a correlation between successive collisions in a damage p…