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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of Ols core-level of p- and n-type high-Tc copper oxides: Evidence for a different nature of carrier doping
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 54 (1993), S. 1199-1202 
    Details
    ISSN: 0022-3697
    Keywords: Ols core-level ; Photoelectron Spectroscopy ; p-/n-type superconductors
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(93)90166-O
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of oxygen contents and cation valences in the superconducting bismuth and thallium cuprates (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 31-35 
    Details
    ISSN: 1572-9605
    Keywords: Thallium superconducting cuprate ; bismuth superconducting cuprate ; potentiostatic electrolysis ; coulometry ; cation valence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The oxygen contents and valences of cations in various superconducting cuprates such as Bi2Sr2(Ca, Y)Cu2O y , Tl2Ba2Ca n −1Cu n O y , etc. which contain two kinds of multi-valence metals have been determined by novel wet chemical methods. The wet chemical methods are based on the differences in oxidation power of each cation and at the last step an electrochemical method is employed for measuring the amount of reducing agent, i.e., CuCl. For superconducting Bi-based cuprates, a modified constant-current coulometry has been developed. For the superconducting Tl-based cuprates a constant-potential electrolysis method which makes it easy to control the electrolysis potential has been applied. The results obtained for Bi2Sr2(Ca, Y)Cu2O y have shown that both Bi- and Cu-valences decrease with increasing Y, which is consistent with the results of earlier works. The results obtained for the double Tl-O layer superconductors show that the Tl valence is about +3 in all the thallium cuprates and different from the value obtained from XPS measurements of earlier works. The reason for this discrepancy is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732238
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The structure of water and methanol adsorbed on silica gel by FT-NIR spectroscopy (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 855-861 
    Details
    ISSN: 1435-1536
    Keywords: Adsorption ; silica gels ; water structure ; NIR spectroscopy ; methanol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The NIR adsorption spectra were analyzed quantitatively on the fundamental, combination and first overtone region of OH vibrations of silanol groups, water and methanol adsorbed on mesoporous silica gels. Adsorbed methanol constitutes first layer of about 3 molecules/um−2 and second layer, the structure of which is similar to that of bulk methanol liquid. Adsorbed water consists of a first layer of about 3 molecules/nm−2, the second layer of about 9 molecules/nm−2 and the third layer has a structure similar to the that of bulk water. The molecular configuration at the interface is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01417870
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    Paper (German National Licenses)
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