Materials Literature
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Abstract Results of heating five lime‐alumina mixtures for 3–120 h. at temperatures from 1045° to 1405° are presented. The mixtures were prepared from mixtures of CaCO 3 (calcite) and α‐Al 2 O 3 and also from co‐precipitated hydroxide gels. Significant departures from equilibrium were noted. In general the gel mixture…
Thin films of zone-refined aluminium have been bombarded at 80°c with a flux of 1.6 × 1010 fission fragments cm−2 sec−1 for various times. Defects can be discerned after 30 sec when the films are viewed in the electron microscope and after longer timès they enlarge into dislocation loops. The larger loops lie near {11…
Calorimetric measurements by Rao and Giauque (1960) showed some unaccountable residual entropy in crystals of [formula] at low temperatures. We have investigated the crystal structure in search of an explanation of the disorder. The resulting structure offers no possibility of disordered rings of hydrogen bonds such a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkaloid Studies. XXXIX.1 The Occurrence of Dihydrocorynantheol and Aricine in Aspidosperma marcgravianum WoodsonB. Gilbert, L. D. Antonaccio, and Carl DjerassiCite this: J. Org. Chem. 1962, 27, 12, 4702–4704Publication Date (Print):December 1, 1962Publication History Publis…
Instances of contact dermatitis from free formaldehyde in textiles continue to be reported from abroad, especially from the Scandinavian countries.<sup>1-3</sup>In the United States, a single report of dermatitis due to formaldehyde in paper has appeared.<sup>4</sup>Various formaldehyde resins are widely used for impr…
The ferroelectric switching time of barium titanate single crystals has been measured at room temperature as a function of electric field and crystal thickness. The switching time was found to be independent of crystal thickness at high fields in disagreement with earlier work by Merz, who found the switching time pro…
The absorption spectra and dielectric constants of three of the four polymorphs of 1,3,5,7-tetranitro-1,3,5,7-tetrazacyclooctane (HMX) have been examined. The difference in absorption frequencies shows that these crystal forms are more distinctive than are most polymorphs. Likewise the distortion polarizations of HMX-…
The room temperature electron spin resonance spectrum of type IIa diamonds irradiated with 2 Mev electrons has been measured at a frequency of 9.5 kMc/s. The spectrum has been analysed into four systems, all of which show a g value within 0.2% of the free-spin value: A single isotropic line with a width of about 5 gau…
The magnetic susceptibilities of single crystals of NiSO 4 ·7H 2 O and α-NiSO 4 ·6H 2 O have been measured in the temperature range between liquid helium and room temperatures. The magnetic susceptibility of these salts at low temperatures shows that the level splittings in the ground of each salt are not so small. Th…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA STUDY OF THE ADSORPTION OF CARBON MONOXIDE AND OXYGEN ON PLATINUM. SIGNIFICANCE OF THE "POLARIZATION CURVE"1S. GilmanCite this: J. Phys. Chem. 1962, 66, 12, 2657–2664Publication Date (Print):December 1, 1962Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPHOTOCHROMISM IN SPIROPYRANS. PART IV.1 EVIDENCE FOR THE EXISTENCE OF SEVERAL FORMS OF THE COLORED MODIFICATIONRahel Heiligman-Rim, Yehuda Hirshberg, and Ernst FischerCite this: J. Phys. Chem. 1962, 66, 12, 2465–2470Publication Date (Print):December 1, 1962Publication Histor…
A modified Bridgman‐Stockbarger method was used to grow single crystals of MgF 2 weighing about 200 g. The purity of the charge material was critical. Purification was achieved by first drying technical‐grade MgF 2 and then vaporizing in vacuum. Spectral transmission of the single crystals was measured; in comparison…
An equivalent circuit is described for the three-winding transformer which is similar in form to the classical equivalent T of the two-winding transformer. As in the equivalent T, the performance of the circuit shown can be visualized and the elements of the circuit can usually be related to specific transformer const…
Summary Florencite with ω 1·653, εd 1·661, G 3·45 7 , a 6·971 ± 0·004 Å, c 16·42±0·13 Å, and rhombohedral unit-cell contents Sr 0·42 Ce 0·52 Ca 0·14 Al 2·83 (PO 4 ) 1·77 (SO 4 ) 0·10 F 0·41 (OH) 5·24 (H 2 O) 0·85 occurs in the Kangankunde carbonatite in Nyasaland, and goyazite with G 3·38 6 , a 6·982±0·001 Å, c 16·54±…
Effect of prebuckling and edge-support induced stresses on the buckling of perfect cylinders
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedistribution and Reduction Reactions of AlkoxysilanesJohn W. RyanCite this: J. Am. Chem. Soc. 1962, 84, 24, 4730–4734Publication Date (Print):December 1, 1962Publication History Published online1 May 2002Published inissue 1 December 1962https://pubs.acs.org/doi/10.1021/ja0…
Transmission electron microscopy is used to observe damage in alpha -Fe foils, following irradiation of the foils to total doses of 5 x 10/sup 17/ to 1 x 10/sup 19/ neutrons/cm/sup 2/ (neutron energy above 1 Mev). The irradiations are carried out at 60 deg C. The irradiation damage can be observed directly, in the for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Determination of Silicon-Carbon and Silicon-Hydrogen Bond Dissociation Energies by Electron ImpactW. C. Steele, L. D. Nichols, and F. G. A. StoneCite this: J. Am. Chem. Soc. 1962, 84, 23, 4441–4445Publication Date (Print):December 1, 1962Publication History Published onl…
The structure of Mg(NH 4 ) 2 (SO 4 ) 2 · 6H 2 O has been redetermined in order to assign the hydrogen bonds. The crystals are monoclinic, space group P 2 1 / a , with a = 9.324, b = 12.597, c = 6.211 Å, and β = 107.14°. The structure previously reported by H ofmann has nearly correct coordinates for the Mg, S, and N a…