Observation of Oscillatory Magnetostriction in Bismuth at 4.2°K
Received 3 September 1963DOI:https://doi.org/10.1103/PhysRevLett.11.331©1963 American Physical Society
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The present state of quantitative X-ray microanalysis Part 2: Computational methods
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…
STIMULATED EMISSION IN RARE-EARTH CHELATE (EUROPIUM BENZOYLACETONATE) IN A CAPILLARY TUBE
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…
Acidodiethylenetriaminegold(III) Complexes: Preparation, Solution Chemistry, and Electronic Structure
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
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…
An LCAO-MO-Study of Static Distortions of Transition Metal Complexes
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://…
Lattice Vibrations of LaCl3 and LaBr3 from Vibronic Spectra
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…
Some new habit features in crystals of long chain compounds part III. Direct observations on unflattened monolayer polyethylene crystals
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…
Some new habit features in crystals of long chain compounds part IV. the fold surface geometry of monolayer polyethylene crystals and its relevance to fold packing and crystal growth
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…
SOME NEW AND INTERESTING MASTOGLOIA FROM THE MEDITERRANEAN AREA AND THE FAR EAST
SYNOPSIS After some general remarks concerning the interpretation of certain structural markings of Mastogloia , which have hitherto often been neglected, but which must now be considered as being of value in separating otherwise similar species, some new Mastogloia are described, in the first part from collections ma…
Equilibrium Polymerization under Pressure: The Case of Sulfur
A previously derived theory of equilibrium polymerization is generalized to take into account the effect of superposed hydrostatic pressure, and the results are applied to the equilibrium polymerization of sulfur. It is shown that the transition which at atmospheric pressure occurs at about 160°C is shifted with press…
THE PHOTO‐DTMERS OF ANTHRACENE, TETRACENE AND PENTACENE
Abstract— Ultra‐violet irradiation of deoxygenated solutions of anthracene, tetracene or pentacene causes the disappearance of the polyacene absorption spectrum and the appearance of an absorption spectrum which is attributed to the photo‐dimer of the polyacene. Molecular structures for ditetracene and dipentacene are…
A Note on the Classification of Ferroelectrics
It has been tried to classify newly discovered ferroelectrics as well as old ones according to their Curie-Weiss constants. Results have suggested that the displacive type ferroelectrics are not necessarily oxide crystals, and have also shown that small Curie-Weiss constants are not very rare in new ferroelectrics. Cl…
Pressure Sintering: Mechanisms and Microstructures for Alumina and Magnesia
Pressure sintering (or hot‐pressing) of pure alumina and magnesia in graphite dies and in ceramic dies over the range 1100° to 1700°C and 4000 to 10,000 psi has been shown to be very useful in fabricating these materials with controlled microstructures (e.g., very high relative density and fine grain size or controlle…
Infrared Optical Properties of Cuprous Oxide
The transmission and reflection spectra of cuprous oxide have been measured from 2 to 25 μ. The transmission studies included Cu2O18. The isotope shifts help to establish that all the observed infrared bands are due to lattice vibrations and not to defect mechanisms as some authors have suggested. The reflectivity can…
Triplet Energy Transfer and Triplet-Triplet Interaction in Aromatic Crystals
Triplet energy migration and triplet-triplet annihilation leading to fluorescence radiation are discussed. The molecular crystals considered are arthracene and naphthalene. Conclusions concerning the mechanism of the triplettriplet annihilation, the recombination of the ion pair, and the rate- determining step in the…
Aromatic polyimides
Abstract Aromatic polyimides were prepared in two steps. Pyromellitic dianhy dride was added to a solution of an aromatic diamine in a highly polar solvent, such as dimethylformamide, dimethylacetamide, dimethyl sulfoxide, or N ‐methyl‐2‐pyrrolidone, until a high molecular weight polypyromellitamic acid was obtained.…
Generation of Microwave Elastic Vibrations in a Disk by Ferromagnetic Resonance
A calculation is presented of the generation of microwave elastic waves by the uniform precession resonance in ferromagnets. The excitation of the thickness shear modes in a normally magnetized ferromagnetic disk is treated. For uniform precession the elastic modes are driven only on the surfaces of the disk. The effe…
Acid Retardation. Simple Physical Method for Separation of Strong Acids from Their Salts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid Retardation. Simple Physical Method for Separation of Strong Acids from Their SaltsM. J. Hatch and J. A. DillonCite this: Ind. Eng. Chem. Process Des. Dev. 1963, 2, 4, 253–263Publication Date (Print):October 1, 1963Publication History Published online1 May 2002Published…
Structure of Molten Oxides. I. Viscosity of GeO2, and Binary Germanates Containing Li2O, Na2O, K2O, and Rb2O
An improved counterbalanced sphere viscometer was used to determine the viscosity of pure molten GeO2 at temperatures from 1470° to 1720°C. This data agrees with the Kurkjian and Douglas data obtained below 1500°C. Activation energy and entropy calculations suggest a gradual thermal breakdown of molten GeO2 compared t…