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The energy-transfer rate from the Er(3+)(4)I(13/2) level to the Tm(3+)(3)H(4) level (C(11')N(T)) in BaF(2)/ThF(4) fluoride glass is measured and calculated. The results can be used to determine whether rate equations can be used to predict energy-transfer rates.
We have carried out a series of ion dynamics simulations on binary silicate systems ranging from MnO–SiO2, which shows a large liquid–liquid miscibility gap, to K2O–SiO2, which does not unmix even below the stable liquidus. We have used Coulomb attractions plus Born–Mayer–Huggins repulsive pairwise-additive potentials…
Abstract Die Kinetik der entarteten Cope‐Umlagerungen der Titelverbindungen wurden mittels dynamischer 13 C‐NMR‐Spectroskopie gemessen. Die aus den NMR‐Linienformänderungen abgeleiteten Reaktionsgeschwindigkeitskonstanten k lieferten auf der Basis der Eyring‐Gleichung folgende Aktivierungsparameter: Semibullvalen ( 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe structure of d0 ML6 complexesSung Kwon Kang, Thomas A. Albright, and Odile EisensteinCite this: Inorg. Chem. 1989, 28, 9, 1611–1613Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1 May 1989https://pubs.acs.org/doi/10.10…
Results are presented for the effects of substitution of Ru, Rh, and Pd for Fe in ${\mathrm{CeFe}}_{2}$. For Rh and Pd the Curie temperature is lowered for up to 10% substitution without change in magnetic character. Ru substitutions produce (for 4% to 8%) the low-temperature loss of ferromagnetism observed for around…
Abstract Polyolefin composites were prepared with CaCO 3 fillers of different specific surface area. The fillers were surface treated with stearic acid between 0 and 100% surface coverage. As an effect of the treatment, surface tension of the fillers and also polymer/filler interaction decreased. The relation between…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolychalcogenide synthesis in molten salts. Novel one-dimensional compounds in the potassium-copper-sulfur system containing exclusively S42- ligandsMercouri G. Kanatzidis and Younbong ParkCite this: J. Am. Chem. Soc. 1989, 111, 10, 3767–3769Publication Date (Print):May 1, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical aging studies in polymer blends. 2. Enthalpy relaxation as a function of aging temperature in a poly(vinyl methyl ether)/polystyrene blendJohn M. G. Cowie and Roderick FergusonCite this: Macromolecules 1989, 22, 5, 2312–2317Publication Date (Print):May 1, 1989Public…
We present a new method for calculating electrostatic interactions in periodic systems with charged or dipolar particles. The method is appreciably faster than the Ewald summation method used until now in computer simulations of ionic and dipolar systems. The method may also be used for calculating the periodic crysta…
The interaction of oxygen with Pd(110) has been studied by thermal desorption spectroscopy (TDS), work function change (Δφ), and Auger electron spectroscopy (AES) at 100<T<900 K. Thermal desorption spectra reveal three major peaks, a low temperature one (α) being from molecular adsorbates and the other t…
Abstract Electro-optical properties based on light scattering controlled by a.c. electric field were investigated for polymer/(liquid crystal) composite films. Scanning electron microscopic observation for the matrix polymer after extraction of LC with methanol exhibited that LC molecules were continuously embedded in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of order on the photophysical properties of the liquid crystal zinc octakis(.beta.-octoxyethyl)porphyrinBrian A. Gregg, Marye Anne Fox, and Allen J. BardCite this: J. Phys. Chem. 1989, 93, 10, 4227–4234Publication Date (Print):May 1, 1989Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR study of acid-base equilibria and other reactions of ammineplatinum complexes with aqua and hydroxo ligandsTrevor G. Appleton, John R. Hall, Stephen F. Ralph, and Craig S. M. ThompsonCite this: Inorg. Chem. 1989, 28, 10, 1989–1993Publication Date (Print):May 1, 1989Publi…
The cellular photosensitivity caused by aluminum phthalocyanines sulfonated to different degrees (AlPcSn) has been investigated. The phototoxic effect increased with decreasing number of sulfonate groups on the macrocycle, with the exception of AlPcS1 which was less phototoxic than AlPcS2 but more phototoxic than AlPc…
The dehalogenation of lindane by a range of hemoproteins, porphyrins, and corrins has been tested under reducing conditions in the presence of dithiothreitol. In addition, a series of porphyrin-metal ion complexes have been prepared and have also been screened for the capacity to dehalogenate lindane. Hemoglobin, hemi…
Trends in interface debonding have been calculated during fiber pullout for composites with interfaces subject to residual tension. The debond behavior is shown to depend sensitively on the thermal expansion mismatch. The results are used as the basis for designing a pullout test specimen suitable for measuring the mi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of strontium analogs of barium yttrium cuprate perovskites via chemical substitutionSteven A. Sunshine, L. F. Schneemeyer, T. Siegrist, D. C. Douglass, J. V. Waszczak, R. J. Cava, E. M. Gyorgy, and D. W. MurphyCite this: Chem. Mater. 1989, 1, 3, 331–335Publicat…
Two series of rigid chain polyesters having flexible linear side chains from 6 to 16 carbon atoms were synthesized and studied by optical microscopy, differential scanning calorimetry, and X-ray diffraction. They were prepared by melt condensation polymerization of 2,5-dialkoxyhydroquinones with terephthalic acid in o…
Current-voltage characteristics have been obtained for various metal contacts formed on boron-doped diamond epitaxial film prepared on synthesized Ib diamond by the microwave plasma-assisted chemical vapor deposition method. Ti contacts and W contacts have exhibited good ohmic and Schottky properties, respectively. Fo…
Plasma emission actinometry has been used to study the mechanism by which small additions of oxygen (∼0.5%) enhance the rate of diamond deposition in a dilute (4%) CH4/H2 discharge at high temperature (900–1300 K). Increasing amounts of CH4 in the feed depress [H], while increasing the O2 concentration, up to ∼5%, pro…