Materials Literature
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The structure of NaTaO3 has been determined from X-ray powder diffraction spectra by measuring the intensities of the difference reflexions caused by the deviations from the ideal cubic perovskite structure. The structure is compared with that determined on the basis of single-crystal measurements.
Thermogravimetry in reducing atmospheres was used to study the oxygen Stoichiometry of several Cu‐substituted lanthanum manganates. The oxygen content of the samples at various levels of reduction (to La 2 O 3 , MnO, and Cu) was calculated from the gravimetric data. Freeze‐dried samples prepared by firing at 1100°C in…
Over 80 percent of the world's annual output of zirconium is fabricated into components for nuclear reactors. In 1976 the CANadian Deuterium Uranium (CANDU) power reactor program will require nearly 500 Mg of zirconium and by 1986 the requirement will have risen to nearly 800 Mg. Most of this is fabricated into tubes…
Treatment of the nickel(II) or copper(II) derivative of octaethyl-meso-hydroxymethylporphyrin with sulphuric acid in dimethyl-formamide or -acetamide gives mainly the meso,meso′-ethylenebis(porphyrinatometal) derivative by reactions involving electron transfer from the metal, In the absence of metal, only disproportio…
It is shown that if a ferromagnetic crystal is biased by means of a static magnetic field ${\stackrel{\ensuremath{\rightarrow}}{\mathbf{H}}}_{0}$, then the electric field dependence of the macroscopic magnetic anisotropy energy gives rise to linear as well as to two kinds of bilinear magnetoelectric effects. When expr…
Concrete canisters for interim dry storage of spent, irradiated Canadian Deuterium Uranium (CANDU) fuel are being developed by Atomic Energy of Canada Limited. The canisters are designed to contain fuel safely for periods of 50 to 100 yr in carbon steel baskets sealed inside a steel- and lead-lined concrete shield. A…
Exchange of quaternary ammonium type anion exchange beads with NaBH4 leads to useful reducing agents possessing the advantage of easy work-up.
We have measured length change vs time for several low thermal expansion materials maintained in evacuated environments at constant temperature (near 300 K). Materials were two types of fused silica, Cer-Vit, ULE, Zerodur, Invar, and super Invar. Δ L/L was measured over a period of 170 days to a precision of two to th…
The critical stress‐intensity factor, K 1C , and the fracture strength, σ f , have been investigated on both hot‐pressed and sintered lithia‐stabilized β ”‐alumina. The hot‐pressed material possessed a strong preferred orientation with many of the basal planes aligned perpendicular to the direction of hot‐pressing. Bo…
"The Corrosion and Oxidation of Metals." British Corrosion Journal, 12(1), p. 5
Research Article| November 01, 1977 Triassic blueschist from northern California and north-central Oregon Preston E. Hotz; Preston E. Hotz 1U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Marvin A. Lanphere; Marvin A. Lanphere 1U.S. Geological Survey, M…
Abstract The one‐electron density function, ρ( r ), (in principle deduced from elastically scattered X‐ray intensities) is the probability distribution function of an electron, averaged over the positions of all other electrons. A partitioning of ρ( r ) into constituent parts is an intellectual exercise that does not…
The electrical conductivity and thermoelectric power of lead zitconate-titanate Pb(Ti0.47Zr0.53)O3 (PZT) have been studied at temperatures up to 1000°C in gaseous ambients with controlled partial pressures of both volatile components: lead oxide and oxygen. The experimental results show the small polaron conduction me…
Samples of LaMn 1‐x Cu x O 3‐y in the range 0≤x≤0.8 were prepared from freeze‐dried solutions of the nitrates. Samples with x≤0.6 were single‐phase perovskites. At higher values of x , the samples contained La 2 CuO 4 and CuO as well as the perovskite phase. Samples of LaMn 1−x ,Cu x ,O 3−y supported on ceramic monoli…
The thermal decomposition and combustion mechanisms of PVC are examined.
Nitro-compounds were reduced to amines in high yields by using palladium, platinum, or rhodium metal catalyst with formic, phosphinic, or phosphorous acid. With formic acid, nitro-compounds containing fluorine were reduced but not those containing chlorine, bromine, or iodine. With the other acids, nitro-compounds con…
A wide range of thiols have been exposed to 60Co γ-rays at 77 K both in the pure state and in dilute methanolic or aqueous glasses. Spectra assigned to RS· radicals had gz values (z is along the C–S bond) which varied with the environment, but which were all close to 2.158 in methanol. Dissociative electron capture at…
The theory of structural stability of ceramics in severe thermal environments was explored via the use of precracking. It was shown that structural stability should be possible when an array of precracks is used, but that the precracks required for this purpose are relatively large. The approach is thus limited to sys…
Description The Fourth Conference on Composite Materials: Testing and Design was held 3-4 May 1976 at Valley Forge, Pa. The American Society for Testing and Materials' Committee D30 on High Modulus Fibers and Their Composites sponsored the conference. J. G. Davis, Jr., National Aeronautics and Space Administration-Lan…
Abstract An outline is given of heterogeneous nucleation as the main starting point for crystallization of unoriented polymer melts and solutions. The influence of temperature history on nucleation is discussed. As little is known about naturally occurring nucleants, the nature of several types of artificial nucleatin…