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  • 57Fe Mössbauer spectrometry  (1)
  • hydantion  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Thermal and spectroscopic characterization of several derivatives containing a new organic ring system (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 665-683 
    Details
    ISSN: 1572-8943
    Keywords: DTA ; DSC ; hydantion ; new ring ; tropane ; X-ray
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Several derivatives containing a new organic ring system, the tropane-6-spiro-5′-hydantoin structure (namely 8-alkyl-8-azabicyclo [3.2.1.] octane-6-spiro-5′-imidazoline-2′,4′-diones) have been characterized by thermal (DSC and simultaneous DTA-TG-DTG) and spectroscopic techniques (IR,1 H-NMR,13 C-NMR). X-ray powder diffraction and elemental analysis were applied for structural and molecular characterization. All the compounds melt in the range 160–250°C and undergo decomposition with progressive mass loss after the solid-liquid thermal transition with molecular degradation. It was found that tropane-6-spiro-5′-hydantoin derivatives with the hydantoin ring in β position are thermally less stable than those containing this ring in α position.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979038
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  • 2
    Electronic Resource
    Electronic Resource
    A Fitting Procedure to Describe Mössbauer Spectra of FINEMET-type Nanocrystalline Alloys (2000)
    Springer
    Hyperfine interactions 131 (2000), S. 67-82 
    Details
    ISSN: 1572-9540
    Keywords: nanocrystalline alloy ; 57Fe Mössbauer spectrometry ; hyperfine field ; fitting procedure ; intergranular phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We propose a method to describe accurately Mössbauer spectra recorded on nanocrystalline FINEMET-type alloys by means of two independent components. The validity of the fitting procedure is controlled by comparing hyperfine characteristics of spectra recorded under different experimental configurations. In addition, the reliability of the fitting model is discussed from spectra obtained on nanocrystalline alloys resulting from different annealing treatments, i.e., with different crystalline contents. Such a method allows us to estimate more accurately the crystalline fraction and to refine the values of hyperfine parameters, both their annealing temperature and time dependencies, the hyperfine field distribution characteristic of the intergranular component and the magnetic texture. Finally, their changes versus crystalline fraction provide relevant information to describe the nanocrystallization process occurring during the transformation from the amorphous into the nanocrystalline state in the case of FINEMET alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010858927701
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