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  • 1975-1979  (1)
  • 1960-1964  (1)
  • 1978  (1)
  • 1962  (1)
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  • 1975-1979  (1)
  • 1960-1964  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 16 (1978), S. 381-390 
    ISSN: 1432-0630
    Keywords: 73 ; 72.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Indium-tin-oxide films (ITO films) sputtered in Ar-atmosphere with and without addition of oxygen reveal an irreversible increase in conductivity during annealing in vacuum. This annealing process increases drastically the density of free electrons, while the Hall mobility changes only slightly. Below the annealing temperature the temperature dependence of the conductivity is reversible. In films with low density of free electrons, which behave like non-degenerated semiconductors, two activation energies for the mobility could be found. The irreversible changes, observed during annealing in the vacuum, are explained by diffusion of oxygen from the interior of the film to the surface, followed by desorption of the oxygen from the surface into the vacuum. The excess oxygen in the non-stoichiometric films plays the role of electron traps. The irreversible effects during annealing in the vacuum are partly reversible in the long run. If the annealed films are exposed to oxygen or air their conductivity decreases because of diffusion of oxygen from the surface into the film.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 315 (1962), S. 283-290 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The RAMAN- and TR-spectra of solid, fused, and dissolved (CH3)3SnOH and liquid (CH3)3SnOSn((CH3)3 are reported and the frequencies axe assigned. The spectra of Cl3SnOH and Cl3SnOCH3 · CH3OH are measured to establish the assignement of the SnO-stretching frequency. (CH3)3SnOH forms no H-bridges but associates building Sn-O-Sn-bridges. In aqueous solutions, (CH3)3SnOH is partially dissociated.
    Notes: Die RAMAN- und IR-Spektren des festen und in H2O bzw. CCl4 gelösten (CH3)3SnOH und des flüssigen (CH3)3SnOSn(CH3)3 werden mitgeteilt und die Frequenzen zugeordnet.Zur Sicherung der SnO-Valenzschwingung wurden außerdem die Spektren des Cl3SnOH und Cl3SnOCH3 · CH3OH gemessen. Die Spektren zeigen, daß das |CH3|3SnOH nicht über Wasserstoffbrücken, sondern über Sn-O-Sn-Brücken assoziiert. Der so erreichte Zustand ist offensichtlich sehr stabil, so daß das (CH3)3SnOSn(CH3)3 bereits bei Einwirkung kleinster Mengen Wasser in (CH3)3SnOH übergeht.In den wäßrigen Lösungen des (CH3)3SnOH treten neben undissoziierter Base (CH3)3Sn+-Kationen auf.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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