Materials Literature
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Abstract The temperature dependence of the absorption edge of K 2 SeO 4 is measured in the range 300 to 4.2 K. In this temperature range the dependence of the absorption coefficient on the energy of photons and temperature is described by Urbach's rule. The magnitudes of the band gap obtained are E ∥ = 6.06 and E ⟂ =…
Abstract A copolymer of vinylidene chloride and vinyl chloride containing 13.5% by weight of the latter has been solution blended with four aliphatic polyesters: poly(ϵ‐caprolactone), poly(2,2‐dimethyl‐1,3‐propylene adipate), poly(1,4‐cyclohexanedimethylene succinate), and poly(2,2‐dimethyl‐1,3‐propylene succinate). E…
Abstract Das vollständige Manuskript dieser Zuschrift erscheint in: Angew. Chem. Suppl. 1983 , 427. DOI: 10.1002/ange.198304270
Optical transmission spectra and d‐c conductivity (25°–1000°C) data were obtained on yttria stabilized zirconia (YSZ) single crystals commercially grown by the skull‐melting process. The crystals were doped with up to 2.0 w/o rare earth (Ce, Nd, Er, Pr) and transition (Mn, Fe, Cr, Ni) metal ions, and a few were anneal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of polystyrene molecular weight on the fluorescence of molecular rotorsRafik O. LoutfyCite this: Macromolecules 1983, 16, 4, 678–680Publication Date (Print):April 1, 1983Publication History Published online1 May 2002Published inissue 1 April 1983https://pubs.acs.org/d…
The 7.8-kilobase HindIII insert in phage lambda NM589thyA [Borck, K., Beggs, J.D., Brammar, W.J., Hopkins, A.S. & Murray, N. (1976) Mol. Gen. Genet. 146, 199] was confirmed as originating from Escherichia coli by hybridization analysis and was shown to encode the thymidylate synthetase (5,-10-methylenetetrahydrofolate…
X-ray diffraction studies of a D-galactose-binding protein essential for transport and chemotaxis in Escherichia coli have yielded a model of the polypeptide chain backbone. An initial polyalanine backbone trace was obtained at 3.2 A resolution by the molecular replacement technique, using a polyalanine search model d…
Abstract Two kerolite and one garnierite samples were subjected to progressive heat treatments prior to their examination by infrared spectroscopy (IR) in the 1200-600-cm −1 and 3800-3000-cm −1 regions. The heat treatment of the garnierite (a mixture of nepouite and pimelite) selectively dehydroxylated the nepouite th…
Reflection high-energy electron diffraction (RHEED) is so sensitive to surface morphology that it is difficult to separate the roles of instrument response and surface imperfection in the diffraction. To address this difficulty we have used MBE grown GaAs(001) as a test surface to study the angular dimensions of the d…
Inverse photoemission (or ultraviolet bremsstrahlung spectroscopy) is an emerging new technique for the study of the electronic structure of solid surfaces. It has the important characteristic of being able to probe states between the Fermi level and vacuum level. Here we survey current experimental practice and futur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical routes to paramagnetic dinuclear and mononuclear palladium .pi. complexes stabilized by the pentaphenylcyclopentadienyl ligandKaren Broadley, Gregg A. Lane, Neil G. Connelly, and William E. GeigerCite this: J. Am. Chem. Soc. 1983, 105, 8, 2486–2487Publication…
Thin films of Bi2Te3 and PbTe were produced by sputtering using targets of stoichiometric compounds. The compositions of these sputtered thin films were analyzed by the electron microprobe; the Bi2Te3 film showed nonstoichiometric compositions of Bi=44.5 at.%, Te=55.5 at.%, whereas the compositions of PbTe films were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical reduction of the gold cluster Au9(PPh3)83+. Evidence for an ErErCr mechanism. Formation of the paramagnetic gold cluster Au9(PPh3)82+J. G. M. Van der Linden, M. L. H. Paulissen, and J. E. J. SchmitzCite this: J. Am. Chem. Soc. 1983, 105, 7, 1903–1907Publicati…
We have measured ‘‘in situ’’ the stresses generated in polyimide films produced from the ethyl ester of benzophenone tetracarbolic acid and methylene dianiline during the curing cycle. The room temperature stress in a fully cured film (to 400 °C) is approximately 70 MPa. The stresses at room temperature vary with the…
Synchrotron radiation-excited soft x-ray photoemission is used to study the heterojunction formation of GaAs on Ge(110) by examining 3d-core levels, the valence band (VB), and the secondary electron distribution cutoff in a photoemission spectrum. Arsenic saturation of the Ge(110) surface prior to MBE growth of GaAs c…
The Aquia aquifer in southern Maryland exhibits three regions that are characterized by distinctly different water composition. Region I is about 26 mi (42 km) wide and is parallel to the outcrop area. Water in region I has relatively high calcium (∼30 mg/l), magnesium (∼10 mg/l), and bicarbonate (∼150 mg/l) concentra…
We report on the preparation and properties of "blue" sputtered iridium oxide films (blue SIROF) and compare their properties with those of previous "black" SIROF's as well as anodically grown iridium oxide films (AIROF's). Blue SIROF's are prepared by reactive d‐c sputtering of iridium in argon/oxygen, mixture, at de…
The electron spin resonance (ESR) spectra of the one-electron-reduction products of the 1,2-diphenyl- 1,2-ethenedithiolate complexes M(Ph2C2S2)2 (M = Ni, Pd, Pt) support the view that these reductions are mainly ligand based. Dc cyclic voltammetric studies of the above complexes also show an apparently quasi-reversibl…
Abstract In the crystal of β-(BEDT-TTF)2PF6, BEDT-TTF (bis(ethylenedithiolo)tetrathiafulvalene) molecules are arranged side-by-side. The anisotropy of the electrical resistivity shows that β-(BEDT-TTF)2PF6 is the first organic conductor where the conductivity is the largest along the direction parallel to the molecula…
Abstract Physical aging in polystyrene was studied by annealing samples isothermally (at 22°, 57°, and 93°C) for various lengths of time and measuring the changes in the enthalpy and the flexural creep property. The enthalpy decrease reached a constant value after about 10 hours of aging at 93°C, indicating an apparen…