Materials Literature
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history of a great invention, and of a misconception concerning the inventors, is reviewed. In 1878, Ernst Abbe (1) proved that the resolution of the optical microscope is limited by the wavelength of light. This meant that even when immersion optics and ultraviolet light are used, the smallest detail that can ever be…
The compound K2B40~.4H20 = K~[B4Os(OH)4].2H20 is orthorhombic, space group P212121, with four molecules in a cell of dimensions a = 12"899, b = 11.774, c = 6"859 A. The positions of all atoms (including the hydrogen atoms) have been determined. The final R-index is 0.040, and the bond lengths have been determined to a…
The crystal structure of the (~ phase, Mo-:Ni (49-2 __0.2 at.% Mo) has been determined by singlecrystal X-ray analysis. For the orthogonal cell a=b =9.108 +0.005, c=8.852 +0.005 A, Z(exp)= 55.8 __ 0.2. Earlier unsuccessful trials were based on space group P4~212, although there are significant deviations toward orthor…
The preparation, determination of optical properties, and approximate crystal structure of the ferroelectric manganese (III) trioxides of holmium, erbium, thulium, ytterbium, lutetium, and yttrium are reported. The compounds crystallize in the hexagonal system, probable space group P6acm , and their structure is chara…
In order to provide corrosion data on prospective fuel pin cladding alloys for the ML-1 nuclear reactor, four nickel-based alloys: Inconel 600, Inconel 702, Hastelloy X and Nichrome V, were tested in air at 300 psi and 1750 F for durations up to 10,000 hours. Weight changes were determined after various exposure perio…
Abstract Aus Untersuchungen über die Korrosionshemmung durch Dichamin und seine Salze in der Gasphase wird geschlossen, daß die im Gegensatz zur wäßrigen Lösung ausgezeichnete Inhibitorwirkung des Dichamins eine Folge seines hohen Dampfdruckes und der Bildung eines hydrophoben Adosrptionsfilmes an der Metalloberfläche…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation R. F. Lever, F. Jona; Epitaxial Growth of Germanium Using Water Vapor. J. Appl. Phys. 1 October 1…
Abstract Dilatometric measurements show that both isotactic and atactic polypropylenes have two distinct glass transition temperatures. Because of the two transitions, three values for the cubical coefficient of thermal expansion are necessary to accurately define the volume expansion of polypropylene from −80° to +90…
Abstract The Monte Carlo sampling technique was used to evaluate the resulting molecular weight averages and the intrinsic viscosity for wide Schulz‐Zimm distribution polymers, in the range P̄ w /P̄ n ≦ 11, undergoing random chain scission and crosslinking processes. The results may also be used to evaluate the initia…
Scoured cotton yarns were acetylated by two processes: (1) by a 1:3 mixture of acetic anhydride and acetic acid to give a series of low- and medium-substituted products (PA); and (2) a 1:1 mixture of acetic anhydride and isopropyl acetate to give a series of medium- to highly-substituted products (FA). Perchloric acid…
Calculations have been made for the color and luminous efficiency of single phosphors and of blends of such phosphors. In the latter case, all the emission is assumed to come from the phosphors so that the results apply to cathode-ray tubes or to electroluminescent lamps, but not to fluorescent lamps. In these calcula…
Received 3 September 1963DOI:https://doi.org/10.1103/PhysRevLett.11.331©1963 American Physical Society
In x-ray microanalysis allowance must be made not only for absorption of x-rays but also for the effects of penetration, diffusion and backscattering of the incident electrons. In view of the impossibility of pursuing separately every electron path, a simplified diffusion model is proposed and calculations based on th…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Erhard J. Schimitschek; STIMULATED EMISSION IN RARE‐EARTH CHELATE (EUROPIUM BENZOYLACETONATE) IN…
The preparation of acidodiethylenetriaminegold (III) salts with the general formula (Au(dien)X) X2 (dien NH2C2H4NHC2H4NH2 and X Cl(-), Br(-) is reported. The complexes are acids in aqueous solution, ionizing a proton from one of the amine nitrogen atoms. The resulting con jugate bases, (Au(dien-H)X) X (dien-H) dien le…
Stress-corrosion cracking facts and theories are reviewed, especially the phenomena found with stainless steels and with α-brass. Evidence is given that stress-corrosion "cracking" is not rupture of brittle metal. Rather, cracks propagate by rapid dissolution of their mechanically yielding advancing edges, while their…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn LCAO-MO-Study of Static Distortions of Transition Metal ComplexesL. L. Lohr Jr. and William N. LipscombCite this: Inorg. Chem. 1963, 2, 5, 911–917Publication Date (Print):October 1, 1963Publication History Published online1 May 2002Published inissue 1 October 1963https://…
The polarized vibronic spectra of PrCl3 and PrBr3, as well as Pr3+ in LaCl3 and LaBr3, were observed. The theory of vibronic transitions for the dilute salt is shown to predict a spectrum which closely resembles the vibronic spectrum of the pure salt, in agreement with experiment. Approximations valid when the optical…
By special light optical observation techniques monolayer polyethylene single crystals could be examined in their uncollapsed configuration while still in suspension and related to their fully or partially collapsed forms seen electron-microscopically. The existence of the previously deduced non-flat based hollow pyra…
The obliquity of the fold surfaces of monolayer polyethylene crystals was investigated quantitatively. Two crystal types were used: (a) true lozenges formed at 76°c (high supercooling) previously observed as corrugated; (b) truncated lozenges formed at 90°c (low supercooling) previously observed as hollow pyramidal. Q…