Materials Literature
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Abstract The writer's original views (1942) on the polymorphism of calcium carbide are upheld in his discussion of a different phase scheme recently proposed by B ORCHERT and R ÖDER . The lattice constant of the cubic phase, IV, is newly determined as 5,880 ± 0,005 Å at 477 ± 2 °C, and its transition temperature is 45…
The preparation and properties of UB and ThB/sub 4/, and to some extent of UB/sub 2/ and ThB/sub 6/, were studied in view of the possible application of these materials as nuclear fuels. Previous work is briefly reviewed, with particular reference to six reported methods of preparation. The compouirds were prepared by…
Abstract The consumption of various p -phenylenediamines during the oxidation of natural rubber vulcanizates has been investigated in the temperature range of 80–120° C. Oxygen absorption was used to follow the oxidation. Diaryl- p -phenylenediamines were consumed mainly in a termination reaction during the constant r…
High-purity zinc crystals were grown from the melt by the soft mold technique, and bent in such a way that [01̄10] was parallel to the bending axis and the [211̄0] slip direction enclosed approximately 45° with the bending radius. A dislocation etching technique was developed, which reveals the edge dislocations intro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNotes- Ring-Expansion of Pyrrole and IndoleGerhard Closs and Gerald SchwartzCite this: J. Org. Chem. 1961, 26, 7, 2609Publication Date (Print):July 1, 1961Publication History Published online5 March 2003Published inissue 1 July 1961https://pubs.acs.org/doi/10.1021/jo01351a65…
Abstract As the accelerating effect of water in the crosslinking reaction of rubber in natural latex by γ‐irradiation was assumed to stem from the decomposition of water into radicals by γ‐irradiation, more effective reagents were sought among the organic halides which have greater G values for radical formation by γ‐…
The lattice-constant and density method revealed that a high-purity silicon crystal free of dislocations has a perfect lattice without an excess of vacant sites or interstitials (n′=8.00004) within the limits of error, in agreement with the results obtained with the decoration method. The lattice constant of vacuum he…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of Boron-Nitrogen Compounds. III.1 Preparation and Properties of Hexahydroborazole, B3N3H12Gerd H. Dahl and Riley SchaefferCite this: J. Am. Chem. Soc. 1961, 83, 14, 3032–3034Publication Date (Print):July 1, 1961Publication History Published online1 May 2002Published…
Abstract A quantiative study of chain transfer and inhibition reactions makes it possible to determine the ratios k x /K p where K p and k x are the rate coefficients for propagation and for chain tranfer, respectively. Since the absolute values of the constants K p are known for a number of monomers it is possible to…
Marine clays and silts of the Champlain Sea, or "Leda clays", from several locations in the Ottawa and St. Lawrence Valleys, and a Rideau Clay soil profile developed on this material have been examined. Although the textures of the marine sediments varied, there was a remarkable similarity in the nature of the mineral…
The crystal structure of Bi 2 Te 2 Se has been determined by X-ray single crystal methods. The unit cell is trigonal, space group [Formula: see text] with hexagonal cell edges a = 4.28 ± 0.02 Å, c = 29.86 ± 0.10 Å, and there are three formula units per unit cell. The structure is of the C33 type and a comparison is ma…
The rolling texture of high-purity silver is found to change gradually from the common silver type to the copper type as the temperature of deformation increases. The transition is completed in the temperature range 150°–200°C. There is a general correlation between the texture transition and the change in stacking fa…
Previous work by other investigators has shown that a sharply cusped minimum occurs in the resistivity-temperature relationship for fully recrystallized chromium at the Néel temperature, i.e., 35°C. Plastic deformation, on the other hand, eliminates this minimum, and in addition gives rise to a pronounced change in th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid Hydrates of Some HalomethanesTHOMAS A. WITTSTRUCK, WALLACE S. BREY Jr., A.M. BUSWELL, and W.H. RODEBUSHCite this: J. Chem. Eng. Data 1961, 6, 3, 343–346Publication Date (Print):July 1, 1961Publication History Published online1 May 2002Published inissue 1 July 1961https…
The amounts of exchangeable potassium in surface samples of 11 Canadian soils were significantly correlated with uptake of potassium by plants in the greenhouse. Per cent K-saturation and water-soluble potassium were indicative of the percentage of K-uptake that was derived from soil potassium in exchangeable form at…
Ebulliometric studies have been made on the hydrolysis of some zirconium alkoxides, Zr(OR) 4 where R = Et, Pr n , Bu i , and Bu n . The variation of the degree of polymerization of the zirconium oxide alkoxides so produced was determined as a function of the degree of hydrolysis. The results are interpreted in terms o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkaline Earth-Tantalum-Oxygen Phases Including the Crystal Structure of an Ordered Perovskite Compound, Ba3SrTa2O9Francis Galasso, James R. Barrante, and Lewis KatzCite this: J. Am. Chem. Soc. 1961, 83, 13, 2830–2832Publication Date (Print):July 1, 1961Publication History P…
Several ~uorocarbon polym~rs ~ere irradiated with Co60 gamma radiation at doses up to 10 22 ev/g. ~he polymers studIed Included polytetrafiuoroethylene, polytrifiuoroethylene, polychlorotrIfiuoroethy.len~, a copoly.mer of tetrafiuoroethylene with hexafiuoropropylene, and several rubbery vInylIdene fiuorIde copolymers.…
Abstract In sulfur vulcanizates the energy of the bond between the atoms of sulfur in the crosslinks may differ essentially from the energy of the bonds in the main chains of the polymer since, as is known, the thermal decomposition of the polysulfide bonds may be brought about at considerably lower temperatures than…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Selection of Filter Fabrics Re-examinedSperry EhlersCite this: Ind. Eng. Chem. 1961, 53, 7, 552–556Publication Date (Print):July 1, 1961Publication History Published online1 May 2002Published inissue 1 July 1961https://pubs.acs.org/doi/10.1021/ie50619a024https://doi.org/…