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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 7 (1977), S. 417-425 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Abstract The electric conductivity as a function of the applied pressure has been measured for lead oxide powders of various oxygen contents. In the range between PbO2 and Pb3O4 the conductivity decreases by about 16 dec with decreasing oxygen content and shows a plateau between PbO1.7 and PbO1.6. An interpretation of the results is given using known theories of the pressure dependence of powder conductivity. X-ray diffraction analysis shows two intermediate oxides in the observed range:α-PbO x at a composition of aboutx=1.6 andβ-PbO x atx=1.46.
    Notes: Zusammenfassung Für verschiedene Sauerstoffkonzentrationen von Bleioxidpulver wird die elektrische Leitfähigkeit in Abhängigkeit vom Pressdruck angegeben. Mit abnehmendem Sauerstoffgehalt ist im Bereich zwischen PbO2 und Pb3O4 eine Abnahme der Leitfähigkeit um etwa 16 Zehnerpotenzen zu verzeichnen. Auffallend ist dabei daß der spezifische Widerstand in Abhängigkiet von der Sauerstoffkonzentration eine Stufe aufweist sowie einen Bereich starker Druckabhängigkeit der Leitfähigkeit. Eine Interpretation der Ergebnisse wird im Rahmen bekannter Theorien über die elektrische Leitfähigkeit komprimierter Pulver angegeben. Röntgenstrukturuntersuchungen zeigen die Ausbildung von zwei intermediären Oxiden im untersuchten Bereich:α-PbO x mit einer Zusammensetzung von etwax=l.6 undβ-PbO x mitx=l.46.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 10 (1980), S. 441-448 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electronic conductivity of active battery materials has seldom been investigated in detail. The problem is to separate the resistance contributions located in the particle cores and in the particle surfaces. In this paper battery PbO2, the best-known model substance, has been studied.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 29 (1973), S. 1312-1314 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A new technique is described which allows massproduction of parafilm-sachets, containing artificial diet for aphids, under sterile conditions.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 59 (1977), S. 275-277 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The electric conductivity of copper powder of spherical particle shape approximately increases proportionally to both the applied pressure in the range between 50 bar and 500 bar and the grain diameter between 4 μm and 25 μm. This is in agreement with known theory. At higher pressures deviations have been observed, especially at large grain diameters. This may be expalined by the damage of oxide layers on the surface of the powder particles.
    Notes: Übersicht Die elektrische Leitfähigkeit von kugelförmigem Kupferpulver verhält sich zwischen 50 bar und 500 bar proportional zum Preßdruck und steigt im Bereicht zwischen 4 μm und 25 μm ebenfalls annähernd proportional mit dem Korndurchmesser an. Dies steht i m Einklang zu theoretischen Erwartungen. Bei höherem Druck und inbesondere bei groben Kornfraktionen auftretende Abweichungen lassen sich durch die Zerstörung der auf der Oberfläche der Pulverkörner vorhandenen Oxidschicht erklären.
    Type of Medium: Electronic Resource
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