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  • 1985-1989  (1)
  • 1980-1984  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    An optical and structural investigation of rare-earth hydroxycarbonates (1982)
    Springer
    Journal of chemical crystallography 12 (1982), S. 129-142 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Physical data are given for the two polymorphs, ancylite type (A-type) and bastnaesite type (B-type), of the rare-earth hydroxycarbonates [Ln(OH)CO3]. They include infrared absorption spectra and, in the case of neodymium electronic absorption spectra for the 4f 3 configuration recorded at 4 K. From the spectra one concludes that the rare-earth ion largely occupies a single site for both compounds. The OH infrared bands are very sharp. The optical data are compared with the results of structural investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161010
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optical absorption spectra and electron diffraction patterns of rare-earth oxycarbonates (1982)
    Springer
    Journal of chemical crystallography 12 (1982), S. 143-155 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The 4.2 K optical absorption spectra of Ia-(NdO)2CO3 and II-(NdO)2CO3 are reported. Type Ia exhibits, apparently, a single site for neodymium, and type II, at least two sites. Electron-diffraction patterns obtained from flakes suggest a large orthorhombic unit cell for type Ia and confirm the hexagonal symmetry of the unit cell of type II.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161011
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    First evidence of crystalline structure in conducting polythiophene (1985)
    Springer
    Journal of materials science 20 (1985), S. 2687-2694 
    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 In order to optimize the properties of organic conducting polymers we analysed the effect of structure and dopant. The substitution of theβ carbon atoms in thiophene leads to a higher regularity in the corresponding polymer, obtained by electrochemical oxidation. The trifluoromethylsulphonate anion appears to be the best fitting dopant, allowing a 1∶2 doping level of the polymer. Transmission electron microscopy reveals crystal patterns for this highly doped polymer. The obtained electron diffraction and X-ray data are consistent with a hexagonal lattice. The discussion of these results lead us to propose a coil structure for this organic conducting polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553029
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    Paper (German National Licenses)
    Fulltext
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