Materials Literature
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Abstract Four aromatic dinitro compounds containing oxyethylene units 1,2‐bis(4‐nitrophenoxy)ethane, bis(2)‐(4‐nitrophenoxy)ethyl ether, 1,2‐bis(2)‐(4‐nitrophenoxy)ethoxy)ethane, and bis(2‐(2‐(4‐nitrophenoxy)ethoxy)ethyl) ether were prepared by an aromatic nucleophilic substitution reaction that involved 1‐fluoro‐4‐ni…
Extensive single-crystal Mo Kct Bragg-diffraction data sets were collected and analyzed from sigma (a) phases with compositions near Cr4sFe52 that had been annealed at three temperatures (1063, 1013 and 923 K) within the region of a-phase metastability. Precisions of measurement varied from <1% for the relatively few…
Abstract Infrared (IR) spectra in the fundamental and near-IR regions were obtained for Na-saturated Wyoming montmorillonite and reduced-charge Na/Li-saturated Wyoming montmorillonites hydrated under water vapor at 50% RH and dehydrated under vacuum. For the Na-montmorillonite, changes in the intensities of the struct…
Experiments have shown that bubbles approaching an air–water interface give rise to axisymmetric jets projected upwards into the air. Similar jets occur during the collapse of cavitation bubbles near a solid surface. In this paper we show that such jets are well modelled by a Dirichlet hyperboloid, a hyperbolic form o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHalogen oxidation of tetrakis(dithioacetato)diplatinum(II) complexes, Pt2(CH3CS2)4. Synthesis and characterization of Pt2(CH3CS2)4X2 (X = Cl,Br,I) and structural, electrical, and optical properties of linear-chain (.mu.-iodo)tetrakis(dithioacetato)diplatinum, Pt2(CH3CS2)4ICa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic interactions in chloro-bridged copper(II) dimers. Structural and magnetic characterization of bis(.mu.-chloro)bis[chloro(N,N,N'-triethylethylenediamine)copper(II)], [Cu(Et3en)Cl2]2Wayne E. Marsh, Kantilal C. Patel, William E. Hatfield, and Derek J. HodgsonCite this:…
The major source of radiation effects in solid nuclear waste forms is from the alpha decay of the actinide elements. These radiation effects have generally been investigated by doping simulated waste forms with short-lived actinides. Although measurable changes in volume, stored energy, and microstructure occur, no si…
A solution of spiroindolinonaphthoxazine in a common organic solvent shows profound photochromic effect. The colorless form in ethanol displays three absorption bands (~320, 235, 203 nm) in the ultraviolet region of the spectrum. The absorption spectrum of the colored metastable form shows two prominent absorption pea…
Abstract During the last decade modern preparative and structural methods have led to novel and often unexpected oligomeric and polymeric main group element‐sulfur compounds having remarkable bonding and structural properties and reactivities. Examples of important new developments in this area are: the discovery of b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of electron exchange and single-file diffusion on charge propagation in Nafion films containing redox couplesDaniel A. Buttry and Fred C. AnsonCite this: J. Am. Chem. Soc. 1983, 105, 4, 685–689Publication Date (Print):February 1, 1983Publication History Published onl…
The size of a cation is important in determining its site preference. In oxide spinels containing 2 (super +) and 3+) ions (2-3 spinels) there is a tendency for the larger ion to prefer the tetrahedral site; the reverse holds for 2-4 spinels. A set of cation radii optimized to best fit spinel lattice parameters is pre…
A simple definition of random close packing of hard spheres is presented, and the consequences of this definition are explored. According to this definition, random close packing occurs at the minimum packing fraction $\ensuremath{\eta}$ for which the median nearest-neighbor radius equals the diameter of the spheres.…
Measurements of the frequency dependence of the microscopic second-order nonlinear electronic susceptibility are reported for the organic system $p$-nitroaniline. The results are suitably described in terms of a theoretical microscopic mechanism involving highly charge-correlated electron states dominating the second-…
The structural and lattice dynamical aspects of the incommensurate phase transition in ThBr 4 (T c =95K) are studied by means of elastic and inelastic neutron scattering. Above T c the temperature-dependent softening of a low-lying optic mode of wavevector q s approximately=0.3 c* is observed. The combined analysis of…
Evidence for superconductivity in ${(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{E})}_{4}$${(\mathrm{R}\mathrm{e}{\mathrm{O}}_{4})}_{2}$ [where BEDT-TTF is bis (ethylenedithiolo)tetrathiafulvalene] near 2 K for pressures above 4 kbar is reported. This is the first unambiguous obse…
The Mossbauer spectrum of dilute 57 Fe 2+ in MgCO 3 shows a well resolved magnetic hyperfine pattern at 4.2K due to a very slow rate of electronic spin relaxation. Above 60K only pure quadrupole splitting is obtained as a result of very fast spin-lattice relaxation rate. The spin-lattice relaxation behaviour of Fe 2+…
The apparent suppression of plasmon satellites in core-level photoemission at low electron kinetic energy is studied. The process of photoemission is studied in the Golden Rule formulation, and the final-state wavefunction corresponding to the photoemitted electron leaving a plasmon excited in the solid is found using…
57 Fe Mossbauer spectroscopy is used to investigate the low-temperature behaviours of alpha -MnS and MnSe, and the results are successfully interpreted in terms of a crystal field model. In alpha -MnS there are at least two magnetic spin arrangements. At 131K<T<T N the spins are along a cubic (110) direction, whereas…
The DC G(T) has been measured in the approximate range 4-320K for crystalline samples of the series Ti n O 2n-1 with 4<or=n<or=9. This includes the first results reported for n=7, 8 and 9. The G(T) for n=4, 5 and 6 show qualitative differences from the behaviours reported previously, including extra transitions at 127…
Measurements of transient magnetic birefringence are reported for isotropic solutions of a biological rodlike macromolecule, bacterial virus fd. A steep increase of the birefringence and a slowing down of the relaxation process are observed just below the concentration at which the liquid-crystalline phase appears. Th…