Origin of the Scheelite-Powellite Series of Minerals
Correlation of chemistry of mineral series with mineral associations and geologic occurrences, Nevada, California, Montana
Materials Literature
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Free-energy Relationships in Coordination Chemistry. III. A Comprehensive Index to Complex Stability
Efforts to relate metal-complex stability constants to some property of the metal ions involved have led to the development of a correlating numerical index Q with the following characteristics: (i) Q is a two parameter quantity involving ionic charge and electronegativity, which may assume different values for a part…
The characterization of dislocation loops in neutron irradiated zirconium
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.…
Stress–strain behavior of polyolefin blends
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…
Anharmonic Effects in KTa O 3 : Ferroelectric Mode, Thermal Expansion,and Compressibility
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}…
Hammett 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 trioxide
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…
General SCF operator satisfying correct variational condition
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…
On the Theory of Hopping Transport in Disordered Semiconductors
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.
Redox behavior of metallo oxtaethylporhyrins
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…
Layer Compounds
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
Electron Beam Excitation and Damage of Biological Molecules; Its Implications for Specimen Damage in Electron Microscopy
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
SYNTHESIS OF NEW HYDROTALCITE-LIKE COMPOUNDS AND THEIR PHYSICO-CHEMICAL PROPERTIES
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…
Influence of Grain Size on Effects of Thermal Expansion Anisotropy in MgTi 2 O 5
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…
Depolarization fields in thin ferroelectric films
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…
Bond susceptibilities and ionicities in complex crystal structures
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…
Cardopolymers (Loop Polymers)
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,…
Topochemistry of the Thermal Decomposition of Solid Substances
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…
New Ferroelastic-Ferroelectric Compound: Tanane
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.
Cs and H2adsorption on W(100)
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).
The phase transitions of PrAlO3
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…