Materials Literature
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Single crystals of CaF2, SrCl2, BaBr2, and BaClF have been grown. Color centers have been developed in calcium fluoride by treatment with Ca vapor at 850°C and by gamma irradiation at room temperature. It has been observed that additive colorability of the salt depends on the rate of cooling from the additive-coloring…
Summary The surface areas of a number of soils have been determined before and after removal of organic matter by treatment with hydrogen peroxide. The external area as determined by low‐temperature nitrogen adsorption increased after peroxidation. The total area derived from the nitrogen area and cetyl pyridinium bro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of Zinc Acetylacetonate HydrateGunter Rudolph and Malcolm C. HenryCite this: Inorg. Chem. 1964, 3, 9, 1317–1318Publication Date (Print):September 1, 1964Publication History Published online1 May 2002Published inissue 1 September 1964https://pubs.acs…
Summary The exchange of Na, Mg, Ca, Sr, and Ba ions has been studied in the temperature range 25° C‐70° C. Vermiculite shows a preference for divalent ions over Na ions at 25° C and the preference increases very greatly at higher temperatures. The preference is largely determined by the increase in entropy which accom…
Abstract Determinations of the degree of chemical crosslinking and crosslinking efficiency values E (i.e., the number of sulfur atoms combined in the network per chemical crosslink present) have been used in conjunction with the chemical probes triphenylphosphine and sodium di‐ n ‐butyl phosphite to establish the stru…
Abstract The effect of molecular weight average and distribution, defect type, fold plane type and orientation, and the presence of fold domain boundaries on the deformation characteristics of polyethylene single crystals drawn on a Mylar substrate has been investigated. Defect content is suggested to have a bigger ef…
Glasses corresponding to mole formulas R 2 TiO 3 and R 2 Ti 2 O 5 were prepared in 1‐ to 5‐g quantities by quenching in a platinum crucible. K 2 O, Rb 2 O, and Cs 2 O formed fairly stable glasses with TiO 2 . On heat treatment, these glasses nucleated readily and formed opal‐like glasses. Li 2 O and Na 2 O, however, d…
A three-dimensional crystal structure analysis of a hydrated potassium peroxytungstate has served to establish the composition of the compound as KgW2011.4HeO, there being two formula units per unit cell in triclinic crystals of space group PL There are discrete tetraperoxyditungstate anions [W2011.2HeO] 2-in which th…
The irradiation of collagen has been shown to lead to extensive changes in its physical properties (1, 2) despite little change in the chemical composition (3). This suggests that the changes are primarily due to disorganization of the secondary structure. These changes in physical properties may be reflected in the s…
Abstract Durch Umsetzung von Natriumdicyanamid und Kaliumtricyanmethanid mit Salzen zweiwertiger Übergangsmetalle werden in Gegenwart von Pyridin verschiedene Typen von Komplexverbindungen (Me(C 5 H 5 N) 2 (N(CN) 2 ) 2 ), Me(C 5 H 5 N) 2 (C(CN) 3 ) 2 , Me(C 5 H 5 N) 3 (C(CN) 3 ) 2 , und Me(C 5 H 5 N) 4 (C(CN) 3 ) 2 ge…
The shear modulus and logarithmic d ecrement at app roximately 1 cis have been m easured from -180 C to about 150 C for a series of samples of isotacLic polypropylen e prepared by vario Ll s thermal treatments. Th e samples had v ar ying den sities (degrees of crystallinity) and morpholog ies as characterized by spher…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrin Studies: Kinetics of Metalloporphyrin FormationEverly B. Fleischer, E. I. Choi, Peter Hambright, and Allen StoneCite this: Inorg. Chem. 1964, 3, 9, 1284–1287Publication Date (Print):September 1, 1964Publication History Published online1 May 2002Published inissue 1…
FeSO 4. 71-I20 crystallizes in space group _P21/c with a = 14.072, b =6.503, c = 11.041 /~, fl = 105 34', Z =4. The crystal structure had been determined from Patterson and Fourier syntheses using
1 The previously described 8-components (8, 11) are designated a,, for al-al and 8in for al-a2. The two al chains are assumed to be identical, since this fraction appears homogeneous. Direct evidence, however, is lacking on this point.
Abstract The paper reports weight loss vs temperature data for the pyrolytic decomposition of polyethylene, Polyvinylchloride; natural, styrene-butadiene and isopreneisobutene rubbers. A nonisothermal kinetic treatment is developed, based on proposals by Doyle and by Newkirk, resulting in characterization of the pyrol…
Abstract Diffusion coefficients of methane in linear polyethylene melts measured by simple sorption experiments are from 1.5 × 10 −5 to 3.6 × 10 −5 cm. 2 /sec. between 140.0 and 188.3°C. These diffusion coefficients are one‐third to one‐half those of methane in branched polyethylene melts at these temperatures. Solubi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat of Formation of Europium Sesquioxide1Elmer J. Huber Jr., George C. Fitzgibbon, and Charles E. Holley Jr.Cite this: J. Phys. Chem. 1964, 68, 9, 2720–2722Publication Date (Print):September 1, 1964Publication History Published online1 May 2002Published inissue 1 Septem…
An elastic analysis of dislocations in anisotropic media has been applied to study the interaction of dislocations on intersecting {111} planes in the face-centred cubic structure. Both long-range and short-range interactions have been considered in a series of f.c.c. elements; the stability of each configuration resu…
Silver calcium alloys were made from 99.997% silver granules, with an analysis comparable to the spectroscopic standard for silver, and calcium, distilled from high purity granules (Dominion Magnesium Ltd) with a representative analysis, after distillation, of Mg 2 ppm, Fe 0.2 ppm, Si 0.2 ppm, Sr 0.2 ppm, Ba and other…
Tensile, creep, and modulus of elasticity data were determined for hot‐pressed zirconium carbide. The material was relatively impure, containing 1 to 2% nitrogen and 1 to 2% free carbon. Tension and creep properties, which were measured to 2600° C, indicated that above 2100°C the strength was 2000 psi or lower and the…