Materials Literature
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Two-dimensional lattice images have been obtained for the two-, four-, and nine-layer type structures of the Friauf-Laves phase, Mg(Cu0.535Al0.465)2. An intimate correlation is established between the lattice image and the crystal structure. With this relation, layer sequences of disordered stacking regions are determ…
Mössbauer effect measurements were made to study the NiFe2O4 precipitation process from the silicate glass of 50 SiO2–30Na2O–10NiO–10Fe2O3 composition. Both the isomer shift and quadrupole splitting parameters were found to decrease in the NiFe2O4 precipitation process. These decreases were interpreted on the basis of…
A model of electromigration failure under pulsed constant-current excitation is derived. Starting with Black’s expression for electromigration failure under dc conditions, the fractional lifetime consumed per infinitesimal time interval is defined as a function of film temperature. The fractional lifetime consumed per…
Platinum internal electrodes have been introduced into PZT compositions in a multilayer configuration by a conventional tape casting process. Electrical property data for the devices suggest that the piezoelectric coefficients of the multilayer configuration are approximately 20% lower than those of similar plain PZT…
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Reduction of the P2Mo18O626– anion by two electrons results in the mixed valence form and, by using 31P and 17O n.m.r. high resolution spectra, these electrons are deduced to be firmly trapped by two adjacent molybdenum atoms located in both half-units of the anion.
The polarization of the three stretching vibration bands of hydrogen or deuterium impurities in the tetragonal low temperature phase of monodomain SrTiO3 and their splitting under applied electric fields allow these modes to be assigned to energetically different positions - one in the (Ti-O)-plane and two with compon…
Abstract— On unsensitized photooxygenation magnesium meso ‐tetraphenylporphyrin underwent oxidative ring cleavage yielding a bilitriene derivative as the sole product. Kinetic studies by quenching technique using singlet‐oxygen quenchers, ß‐carotene and α‐tocopherol, and by substrate direct disappearance technique (Fo…
The melt spinning of Fe–B and Fe–Si–B alloys with a melting point up to 1580 K was carried out and the spinning was successfully performed from a melt at a temperature of 1630 K with winding speeds ranging from 0.95 ms−1 to 7.95 ms−1. The diameters of the filaments obtained were 2 to 13 μm and decreased with increasin…
The dimensions of specimens undergoing preparation for examination in the SEM were measured throughout the preparative sequence or at various important stages. The tissues studied included 15-day mouse embryo limbs (MEL), small blocks of adult mouse liver and brain, and potato tuber. The animal tissues were fixed in 3…
Prototypic driver-fuel elements using metallic fuel and stainless-steel cladding, designed to achieve a high burnup, were tested in the Experimental Breeder Reactor II. The irradiation results showed that burnup of up to 10 at.% can be attained without cladding failure and that cladding deformation can be kept to acce…
The contact angles, θ, of pure liquids and of ethanol + water mixtures on griseofulvin powders have been determined from the rates of liquid permeation through powder beds. The associated free energies of adhesion and immersion (ΔiG) were negative. The corresponding enthalpies of immersion (ΔiH) were measured calorime…
The saturation effects of Eu 3+ luminescence in Y 2 O 2 S have been investigated using a pulsed nitrogen laser at room temperature and at 80 K, and also under pulsed cathode-ray excitation at room temperature. Interaction between excited-state Eu 3+ ions gives rise to a predominant energy-loss mechanism causing satura…
Oxidation of 1-aroylpyrroles by palladium acetate in acetic acid gave the corresponding 1,1′-diaroyl-2,2′-bipyrroles, which were easily hydrolysed in MeOH–H2O containing HCl to give 2,2′-bipyrrole.
Abstract Polarized IR‐reflection and Raman scattering spectra are obtained for TlGaTe 2 , TlInTe 2 , and TlInSe 2 crystals (space group D ). The IR‐reflection spectra of all the crystals show the presence of two ( E ‖ c ) and three ( E ⟂ c ) modes, which is in full agreement with the prediction of a group‐theoretical…
The concept of modeling an impact cratering event with an explosive event with the explosive buried at some equivalent depth of burst (d.o.b.) is discussed. Various and different ways to define this equivalent d.o.b. are identified. Recent experimental results for a dense quartz sand are used to determine the equivale…
The synthesis is described of an FeII porphyrin carrying an anthracene bridge across one face and a pyridine bridge across the other; this molecule minics the structural features and properties of natural oxygen-carrying systems.
Magnetic susceptibility data have been measured in the temperature range 1.75 to 60 K for the following structurally characterized, single chloride-bridged copper(II) chain compounds: dichlorobis(dimethyl sulphoxide)copper(II), dichlorobis(imidazole)copper(II), aquo(caffeine)dichlorocopper(II), and dichloro[2-(2′-meth…
Abstract The temperature dependence of the dielectric constant, polarization, and elastic compliance as well as the field dependence of the polarization and strain at different temperatures was measured at lead magnesium niobate single crystals for three different directions. From the results some conclusions with res…