Materials Literature
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Dislocation loops formed in zirconium after neutron irradiation and subsequent annealing between 450° and 500°C are not pure edge loops. A general method for analysing such loops by transmission electron microscopy is discussed briefly and a technique for determining the loop plane normal to within ± 5° is described.…
As part of a study on reuse of plastics as blends, the yield tensile strength, elongation at break, and the modulus of melt blends of low-density polyethylene, high-density polyethylene, and polypropylene have been studied over the entire ternary composition range. The modulus and strength are nearly monotonic functio…
The effects of temperature and pressure on the static dielectric constant and lattice parameter of KTa${\mathrm{O}}_{3}$ have been measured. Combined with literature data, the present results allow a determination of the pressure and temperature dependence of the soft-ferroelectric-mode frequency ${\ensuremath{\omega}…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHammett acidity function for some superacid systems. II. Systems sulfuric acid-[fsa], potassium fluorosulfate-[fsa], [fsa]-sulfur trioxide, [fsa]-arsenic pentafluoride, [sfa]-antimony pentafluoride and [fsa]-antimony pentafluoride-sulfur trioxideR. J. Gillespie and T. E. Pee…
We have shown that the correct variational equations for the general SCF orbitals are [Fi−Σj |ψj〉 〈 ψj |Gji] |ψi〉=0, where Gji=λjiFj+(1−λji)Fi; λji≠ 0 and how these may be combined into simple eigenvalue problems. In the course of discussions, we re-examined whether the coupling operators suggested previously are base…
Abstract The electron hopping in presence of both an electric field and a temperature gradient is considered. Expressions for the transport coefficients are obtained, and the temperature dependence of the hopping thermopower is discussed for different temperature regions.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox behavior of metallo oxtaethylporhyrinsJurgen H. Furhop, Karl M. Kadish, and Donald G. DavisCite this: J. Am. Chem. Soc. 1973, 95, 16, 5140–5147Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973https://pu…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
M. Isaacson, D. Johnson, A. V. Crewe, Electron Beam Excitation and Damage of Biological Molecules; Its Implications for Specimen Damage in Electron Microscopy, Radiation Research, Vol. 55, No. 2 (Aug., 1973), pp. 205-224
Abstract The new hydrotalcite-like compounds which consist of divalent metal, trivalent metal and inorganic or organic anion were synthesized and it was found that they have many characteristic properties such as the formation of solid solutions, anion exchange and molecular sieving. Some of them were capable of separ…
Properties relating to the effects of thermal expansion anisotropy were measured as functions of grain size in hot‐pressed dense MgTi 2 O 5 . Samples with grains smaller than ∼3 μm exhibited none of the microcracking attributed to thermal expansion anisotropy, whereas those with larger grains had all the characteristi…
A mechanism is proposed to explain depolarization phenomena that have been observed in thin ferroelectric films and related multilayer devices. It is shown that, for a short-circuited electrode-ferroelectric structure, incomplete compensation of the ferroelectric polarization charge results when the center of gravity…
The concept of crystal ionicity has proved to be a useful unifying concept for understanding chemical trends in diverse problems in chemistry and solid state physics. In particular, the dielectric description of ionicity developed by Phillips and Van Vechten (PV) has been successfully employed in a wide variety of are…
Polymers containing bulky side groups linked in ring form to the main chain are distinguished by a specific set of properties (cardopolymers). The review deals with the characteristics of the synthesis and with the physicochemical properties of cardopolycarbonates, cardopolyarylates, cardopolyamides, cardopolyimides,…
Factors which determine localisation and autolocalisation in topochemical processes are considered systematically in this review. The specific features of the formation and growth of nuclei in topochemical reactions, the role of the anisotropy of the properties of the initial crystal, and various versions of the catal…
We report here evidence for the first paraferroelectric transition observed in a pure molecular solid (without H bonds); we present results from x-ray diffraction, calorimetric and dielectric measurements, and direct optical observation of domain-wall displacement under an applied electric field.
By using LEED and workfunction measurements it has been found that a previously reported c(2*2) structure for Cs on W(100) was due to a small amount of H accumulated on the surface at the beginning of Cs deposition. These H atoms, in the presence of Cs, form patches of c(2*2).
PrAlO 3 has the cubic perovskite structure at high temperatures but is trigonally distorted at room temperature. At about 200 K it undergoes a first-order phase transition to an orthogonal phase, and there is a further phase transition to a triclinic phase at about 150 K. The authors have studied this system by Raman…
An anomaly in the electrical resistivity is observed in the vicinity of the order-disorder transition in an alloy of composition near ${\mathrm{Fe}}_{3}$Al, which is of the form predicted by Suezaki and Mori for antiferromagnets and, hence, order-disorder systems. The anomaly is qualitatively different from the "ferro…
A full spherical retarding-field energy analyser with three grids was made to measure the total secondary electron yield σ, the backscattering coefficient η, and the secondary electron spectrum N(E) as a function of angle of incidence and primary energy in UHV. The instrumental effects of the grid meshes in the measur…