Materials Literature
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The crystallographic and dielectric properties of complex perovskites are described in terms of average A- and B-site ionic radii, charges, and electronic structures. The relative importance of these to the ferroelectric state is evaluated by a study of a number of solid solutions containing trivalent bismuth. Two new…
Sm2+ which occurs as impurity in very small concentrations in LaCl3 has a very distinctive fluorescence spectrum which resembles in all details that of Eu3+. Excitation is through the very strong continuous absorption to 4f55d in the visible. The energy is transferred to the stable states 5D0 and 5D1 of the 4f6 config…
The absorption bands characteristic of the solid molecular complexes of tetracyanoethylene are attributed to the charge transfer interaction between tetracyanoethylene and donor molecules. In the complexes with polycyclic aromatic hydrocarbons the energy gap associated with the semiconductivity agrees well with the en…
Vapor pressures of zirconium over zirconium diboride have been measured by the Knudsen technique over the temperature range 2150° to 2475°K. A new type of apparatus was constructed and used successfully in the study. Zirconium diboride was determined to evaporate congruently at a composition of ZrB1.906(+0.025 or —0.0…
The emission intensities of the rare-earth ions in inorganic compounds are sensitive to changes in structural parameters, the charge type of the cations, and rare-earth concentration. Comparisons of the fluorescence of Eu3+ in a number of related tungstates show that under long-wave ultraviolet excitation comparable s…
The enthalpies of mixing in the binary liquid mixtures of thallium nitrate with lithium-, sodium-, potassium-, and rubidium nitrate have been measured at 350°C. It is found that the molar enthalpy of mixing (ΔHM) varies in a somewhat irregular manner as the size of the alkali ion is varied. In this respect these syste…
Three new ferroelectrics belonging to a family of the general formula $[X{(\mathrm{C}{\mathrm{H}}_{3})}_{4}]\mathrm{Hg}{Y}_{3}$ (where $X=\mathrm{N},\phantom{\rule{0ex}{0ex}}\mathrm{P}$; $Y=\mathrm{C}\mathrm{l},\phantom{\rule{0ex}{0ex}}\mathrm{B}\mathrm{r},\phantom{\rule{0ex}{0ex}}\mathrm{I}$) were discovered. They ar…
Nucleation in ultrasonic cavitation is due to cosmic rays. The neutron component seems sufficient to explain the experiment in water, through the creation of oxygen recoil nuclei which would act as nucleating agents; energy deposit and radiolytic effects produce small overheated and oversaturated regions in which cavi…
The infrared spectra of 10 oxalato complexes have been obtained in the frequency range 4000 to 300 cm—1. A normal coordinate treatment made on the 1:1, metal:ligand model of the chelate ring of tris-(oxalato)-Cr(III) resulted in the assignment of metal-oxygen stretching bands in the range between 600 and 300 cm—1 for…
Plusieurs veines du bassin de Carmaux présentent des intercalaires stériles à faciès particulier, qui ont été spécialement étudiés (diffractométrie, mesure de la radioactivité, dosage des alcalins). On a pu distinguer : — des tonsteins typiques (à quartz et kaolinite) en veine I-Marmottan et en veine G. — des gores (a…
Studies were made by X-ray diffraction method on the scales formed on the surfaces of Ni-Cr-Ti, Ni-Cr-Nb and Ni-Cr-W alloys. The following results have been obtained. (1) NiOTiO2 was formed in the scales of Ni-20Cr-1Ti alloy at temperatures above 1100°C, and in those of Ni-20Cr-2Ti alloy above 1000°C. NiO, NiOTiO2, Cr…
Article Stickstofllegierungen der I-Metalle Mangan, Eisen, Kobalt und Nickel mit Gallium, Germanium, Indium und Zinn was published on January 1, 1962 in the journal International Journal of Materials Research (volume 53, issue 1).
The influence of 475°C embrittlement of high chromium ferritic steels on their corrosion resistance was studied mainly by potentiostatic technics and the mechanism of the 475°C embrittlement process was considered. The results obtained are summarized as follows:(1) The materials aged at 475°C do not lose their corrosi…
The deterioration of the insulation in high-voltage turbo-generator stators can be followed by means of non-destructive tests. The relative merits of the available methods of testing stator insulation are given, but at present a single test will not reliably indicate the insulation condition. The detection of discharg…
moglich, iiber die Existenz zweier neuer Modifikationen zu berichten und deren Strukturen zu beschreiben. Die eine ist hexagonal vom Typ des CeP04. t H20, die andere eine monokline Hochtemperaturform, die sich bei gewohnlicher Tem-peratur sehr langsam in den Monazit-Typ umwandelt. Die hexagonale Struktur wurde aus vVe…
The oxidation reaction of zirconium in air was studied in the temperature range 650°∼850°C. The reaction was followed up by measurements of weight change, chemical analyses of nitrogen absorbed in the oxidized specimens, and electron microscopic observations of the surface and cross-section of specimens. Above 750°C,…
M. R. Everett and G. E. Thompson, Analyst, 1962, 87, 515 DOI: 10.1039/AN9628700515
High-temperature, gas-cooled, graphite-moderated reactors of the type represented by the HTGR feature a continuous removal of volatile fission products by, and their subsequent trapping from, a helium purge stream. Cesium is a volatile fission product of considerable interest; therefore, an investigation of the specif…
Fifty-four kimberlite pipes and dykes cut Precambrian granite in the Singida region of Tanganyika. The pipes range from 60 to 2500 feet in diameter, and occur in clusters and lines. The lines follow fracture zones. In addition to intrusive kimberlite, the pipes contain massive to stratified kimberlite tuff and sedimen…
Abstract Strontium phosphate precipitates were formed by mixing different amounts of Sr(OH) 2 and H 3 PO 4 . A solubility diagram was prepared from the analysis of the supernatant in equilibrium with the precipitate. X‐ray diffraction patterns indicated that there were two compounds, SrHPO 4 and Sr 10 (PO) 6 (OH) 2 .…