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  • 1
    Electronic Resource
    Electronic Resource
    Effects of annealing on infrared and thermal-effusion spectra of sputtered a-Si:H alloys (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 403-409 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Infrared spectroscopy and thermal effusion have been used to study the nature of the silicon-hydrogen bond in sputtered a-Si:H alloys. The samples were prepared by reactive sputtering under different deposition conditions to produce varying hydrogen contents. The Fourier transform infrared spectra have been analyzed using the simplex algorithm to deconvolute the component peaks. This technique has been applied separately to both the stretching- and bending-mode regions of the infrared absorption spectra. Studies have been made of the effects of annealing on both the infrared and the thermal evolution spectra of hydrogen. The results indicate a redistribution and transformation of different bonding configurations due to annealing. A comparative study is presented of the thermal-effusion spectra for partial and total degassing with the infrared spectra taken before and after each phase of degassing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350723
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  • 2
    Electronic Resource
    Electronic Resource
    Conductivities of 1∶1 salts in 2-cyanopyridine (1994)
    Springer
    Journal of solution chemistry 23 (1994), S. 579-593 
    Details
    ISSN: 1572-8927
    Keywords: 2-Cyanopyridine ; conductivities ; 1∶1 electrolytes ; dilute solutions ; single ion molar conductivities ; ion association ; mixed solvents ; acetonitrile ; concentrated solutions ; LiAsF6 ; high energy density lithium batteries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Electrolytic conductivities of eight simple 1∶1 electrolytes have been measured in dilute solutions of 2-cyanopyridine (2CNP) at 30°. Infinite dilution mobilities and association constants were calculated using the Fuoss-Hsia equation. With the exception of LiCF3SO3 all salts show very little association, consistent with the very high dielectric constant of 2CNP. The weak association which does occur is attributed to weak ion-solvent interactions. No evidence was found for triple ion formation. Conductivities of concentrated solutions of LiAsF6 in 2CNP increase slowly with concentration reaching a maximum at a concentration of around 0.65 mol-dm−3. These conductances are slightly lower than those in propylene carbonate which has a lower dielectric constant and a higher viscosity. Conductivities of concentrated LiAsF6 solutions in 2CNP mixtures with acetonitrile vary monotonically, consistent with solution viscosities, and show no sign of the maximum commonly observed in mixed organic solvents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972746
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  • 3
    Electronic Resource
    Electronic Resource
    Apparent molar heat capacities and volumes of electrolytes and ions in acetonitrile-water mixtures (1990)
    Springer
    Journal of solution chemistry 19 (1990), S. 207-223 
    Details
    ISSN: 1572-8927
    Keywords: Apparent molar volume ; apparent molar heat capacity ; electrolytes ; ions ; acetonitrile-water mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Apparent molar volumes Vφ and heat capacities Cp,φ of NaCl, KCl, KNO3, AgNO3, KI, NaBPh4 and Ph4PCl have been measured in acetonitrile (AN)-water mixtures up to xAN=0.25 by flow densitometry and flow microcalorimetry. Limited data have also been obtained for NaF, LiCl and KBr up to x AN =0.15. Single ion volumes and heat capacities of transfer were obtained using the assumption ΔtXφ(PH4P+) = ΔtXφ(BPh4-) where X=V or C p and ΔtXφ is the change in Xφ for a species on transfer from H2O to AN-H2O mixtures. Volumes and heat capacities for simple salts show relatively little dependence on solvent composition. However, ΔtXφ for simple ions show more pronounced variations, exhibiting at least one extremum. These extrema are similar to but much less pronounced than those derived previously for ions in t-butanol-water mixtures. Surprisingly little correlation is found between the present data and other thermodynamic transfer functions. This is attributed to the predominance of ion-solvent over solvent-solvent interactions in AN-H2O solutions. ΔtVφ and ΔtCp,φ for the silver ion differ markedly from those of the alkali metal ions as a result of the well-known specific interaction between Ag+ and AN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650455
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  • 4
    Electronic Resource
    Electronic Resource
    Ion solvation in lithium battery electrolyte solutions. 1. Apparent molar volumes (1991)
    Springer
    Journal of solution chemistry 20 (1991), S. 1059-1078 
    Details
    ISSN: 1572-8927
    Keywords: Apparent molar volumes ; electrolytes ; lithium batteries ; propylene carbonate ; acetonitrile ; dimethoxyethane ; tetrahydrofuran ; mixed solvents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Apparent molar volumes, Vϕ(MX), of seven electrolytes (NaClO4, NaCF3SO3, NaBPh4, LiClO4, LiAsF6, Ph4AsCF3SO3 and KCF3SO3) have been determined by vibrating-tube densimetry in nonaqueous solvent mixtures of propylene carbonate (PC) with acetonitrile (AN), dimethoxyethane (DME) and tetrahydrofuran (THF). Vϕ(MX) was measured at an electrolyte concentration of 0.05M over the entire solvent composition range wherever possible. Ionic apparent molar volumes of transfer, ΔtVφ(ion), were obtained via the tetraphenylarsonium tetraphenylborate (TATB) assumption. ΔtVφ(ion) from PC to the mixed solvents are generally strongly negative for both cations and anions consistent with the greater compressibilities and lower dielectric constants of the cosolvents. In PC/AN mixtures cations and anions have similar values of ΔtVφ(ion) but in PC/DME and PC/THF mixtures they differ considerably. Cationic volumes show the expected dependence on ion-size but the differences among the anion volumes are much greater than expected at high cosolvent compositions. These effects are discussed in terms of preferential solvation and other solvent interactions. The implications of these findings for lithium batteries are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649097
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of charge on bond strength in hydrogenated amorphous silicon (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 15 (1994), S. 644-652 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: We have studied the effect of excess charge on the bond strength in the silanes SiH4 and Si2H6 to assess whether charge trapping in a solid-state lattice might promote the technologically important photodegradation of amorphous silicon alloys (the Staebler-Wronski effect). The calculations indicate that both positive and negative charges reduce the strength of Si—H and Si—Si bonds considerably, to the point where they may be broken easily by visible or even infrared light. © 1994 by John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540150608
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