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  • 1985-1989  (3)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Hydrothermal dissolution of perovskite (CaTiO3) (1987)
    Springer
    Journal of materials science 22 (1987), S. 3217-3226 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Perovskite (CaTiO3) has been exposed to hydrothermal chemical attack in aqueous solution. Dependences on temperature (150 to 250°C) and on duration of attack (1 to 35 days) have been investigated. It was found that a precipitate surface layer was formed. The thickness of this layer ranged from a few monolayers to several hundred nanometres for the least and the most severe hydrothermal conditions, respectively. The composition of the layer, as deduced by surface analytical techniques, suggests that (i) there is congruent dissolution of the perov skite surface, (ii) a TiO2 precipitate layer is formed, and (iii) the presence of silica and CO2 in solution do not appear to affect substantially the mechanism or the rate of dissolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161185
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Scanning and high-resolution Auger analysis of zirconolite/perovskite surfaces following hydrothermal treatment (1988)
    Springer
    Journal of materials science 23 (1988), S. 1514-1520 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Two titanate minerals, zirconolite with perovskite minor phase inclusions, have been subjected to hydrothermal chemical attack. The effects of the treatment have been investigated with scanning and high-resolution Auger analysis. The results suggest that both mineral surfaces act as substrates for carbonate precipitation. Dissolution was found to be the main mechanism of attack for perovskite, followed by precipitation from solution and growth of TiO2 on the perovskite phase regions. There was also precipitation of calcium as fluoride and phosphate, and growth of these crystallites at random locations on the surface of the two-phase ensemble. The zirconolite phase regions were not affected by the hydrothermal treatment, within the resolution of the present experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01154626
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Relationships between X-ray photoelectron spectra, structure and superconductivity in LnBa2Cu3O7-x (1988)
    Springer
    The European physical journal 72 (1988), S. 413-421 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract X-ray photoelectron spectroscopy has been carried out on HoBa2Cu3O7-x (on abraded, fractured and ion beam reduced surfaces). These measurements show that there are only minor differences with similarly obtained results from YBa2Cu3O7-x. The spectral features of the Ln species (Y and Ho), the O 1s, and Ba 3d envelopes are considered in some detail. The low energy contribution to the O 1s envelope has been assigned in part to the effects of Ba−O bonding, either in the LnBa2Cu3O7-x material, or in BaO in minor phase regions, and in part to the effects of the electronic linkage of the Cu planes in the superconducting compound. The anomalous low binding energy contributions to the Ba 3d envelope are also specific to the electronic structure of these materials. It is likely that Ba (and Sr and Ca for the Bi-Sr-Ca-C-O system) plays an important electronic, as well as structural role, in promoting high temperature superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314520
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    Paper (German National Licenses)
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