Materials Literature
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A detailed discussion of the emission spectrum of trivalent chromium-europium pairs is given. Emission originating on the chromium $^{2}E_{g}$ level and terminating on the $^{7}F_{J}$ levels of neighboring europium ions has been observed for $J=1 \mathrm{through} 6$. Good agreement is obtained with the $^{5}D_{0}$ to…
This paper reports new data on the hydrostatic-pressure dependence of the conductivity and static dielectric constant, as well as new Hall-effect data taken over a wide temperature range, in the perovskite-oxide ferroelectrics KTa${\mathrm{O}}_{3}$, SrTi${\mathrm{O}}_{3}$, BaTi${\mathrm{O}}_{3}$, and $\mathrm{K}{\math…
The transition temperature ${T}_{c}$ of $\mathrm{SrTi}{\mathrm{O}}_{3\ensuremath{-}x}$ is calculated as a function of the electron concentration. The effective electron-electron interaction has an attractive part caused by the intravalley exchange of soft optical phonons that have been observed in the tetragonal phase…
It is shown that dielectrically defined average covalent and ionic energy gaps, ${E}_{h}$ and $C$, respectively, can be used to predict crystal structures and absolute band energies in crystals of formula $\mathrm{AB}$ with eight valence electrons per atom pair.
A study was made of the oxidizing behavior at high temperature (800°–1,800°C) in vacuum of UC, UN and U(C,N) samples containing added oxygen in excess amounts, through observations of gas release, X-ray diffraction analysis, and microphotography. The oxidation in vacuum of UC and U(C,N) was found to proceed above 1,20…
Spike-like magnetic domains play several important parts in the magnetization processes occurring in a hysteresis cycle, especially in a material magnetized in an easy direction of magnetization, such as transformer sheet. This theory is applicable to the spike domains observable in bulk magnetic materials but not, un…
The diffusion of trivalent gallium into the rock salt lattice of MgO has been investigated. This has been a first attempt at studying a diffusion process which involves both defect formation and the formation of a new phase, MgGa 2 O 4 , with a moving interface. The study was performed on pre-sintered MgO and β-Ga 2 O…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra of the surface species produced by reactions of ammonia with germania gelManfred J. D. Low and Kunichi MatsushitaCite this: J. Phys. Chem. 1969, 73, 4, 908–910Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published iniss…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
A comprehensive study of a Cr-Ag-Au metalization system, as well as a comparison with an aluminum system, is described. The Cr-Ag-Au metalization system, which can be deposited in a conventional evaporator with relatively little increase in processing complexity, has the desirable characteristics of aluminum metalizat…
Anisotropy aging and stabilization effects have been investigated in vapor-deposited zero-magnetostrictive Permalloy films by annealing either in a rotating magnetic field or in an easy direction field. Two major components in the anisotropy relaxation were observed. Amounts of the two components are comparable in fre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnthalpies of formation of some tungstates, MWO4Alexandra Navrotsky and Ole J. KleppaCite this: Inorg. Chem. 1969, 8, 4, 756–758Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published inissue 1 April 1969https://pubs.acs.org/doi/10.1021/…
Relations for the design of polyphosphate well packs to prevent carbonate scale deposition have been effectively applied in South Sumatran oil fields. Introduction The deposition of calcium carbonate scale on surface and subsurface production equipment creates an operation problem in many oil fields. The formation wat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolysulfide chelates. II. Desulfuration of PtS152- and the synthesis of PtS102-Adrienne E. Wickenden and Ronald A. KrauseCite this: Inorg. Chem. 1969, 8, 4, 779–783Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published inissue 1 April 1…
A flat corrosion interface is unstable on alloys undergoing preferential dissolution of one component. This instability results from the uneven accumulation of the less soluble component which enables pits to develop and grow into corrosion tunnels. Electron microscope observations of Cu3Au exposed to a ferric chlorid…
The europium chelate of 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (thenoyl-trifluoroacetone; TTA) is firmly bound to microorganisms. It fluoresces brightly at 613 nm with activation at 340 nm. Cells may be stained with 10(-3)m chelate in 50% ethyl alcohol, followed by washing with 50% ethyl alcohol. Equal or bette…
Abstract Bei der Schwingmahlung von Quarz tritt Amorphisierung ein und Radikale entstehen. Mahlung im Sauerstoffstrom führt zur Bildung von ‐Gruppen, die durch ESR‐Messung, ihre Oxydations‐ und Reduktionswirkung und ihren thermisch dissoziierbaren Sauerstoff bestimmt werden. — Mahlung in Wasserdampf—Argon‐Atmosphäre e…
A three-terminal capacitance type dilatometer has been developed for investigating the thermal expansion of optical materials at low temperatures. The method is applicable when only small sample lengths (13 mm or less) are available. The thermal expansion coefficients of six polycrystalline materials (the Irtrans) and…
Abstract Time‐lag and static sorption experiments were employed to measure permeability, diffusivity and solubility constants of He, A, and CF 4 in polypropylene films cooled at various rates from the melt and subsequently annealed at varying temperatures near the melting point. While solubility constants in films ann…
Recent studies of fire accidents in Switzerland involving individuals' wearing apparel have illustrated the importance of a durable flame-retardant finish for cotton textiles. Knowledge of the dynamics and chemistry of pyrolysis and combustion is considered essential to understand the mechanism of flame-retardant syst…