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  • Articles  (3)
  • Springer  (3)
  • 1975-1979  (3)
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  • Articles  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Raman scattering investigation of ferroelastic Sb5O7I crystals (1975)
    Springer
    The European physical journal 22 (1975), S. 49-58 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Sb5O7I undergoes a displacive phase transition at 481 K where the symmetry is changed fromC 6h 2 toC 2h 5 . In the low temperature monoclinic phase the crystal is ferroelastic. The polarized Raman spectra of Sb5O7I have been measured at various temperatures below and above the phase transition. The frequencies and symmetries of most of the theoretically expected Raman active phonons in the ferroelastic phase have been determined. The observation of a soft mode in the ferroelastic phase which disappears above the phase transition together with the fact that the unit cell of the ferroelastic phase is twice as large as that of the paraelastic structure permits the conclusion that the phase transition results from a phonon instability at the Brillouin zone boundaryM-point of the hexagonal phase. The temperature dependent splittings and intensity changes of several Raman lines are discussed with respect to the ferroelastic property of the crystal and the phase transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325459
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Raman scattering investigation and symmetry analysis of ferroelectric/ferroelastic Sb5O7I polytype 2MA (1979)
    Springer
    The European physical journal 32 (1979), S. 215-224 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The polytype 2MA (β-Sb5O7I) has the simplest acentric structure of the antimony oxideiodide family. It undergoes an antiferrodistortive phase transition at 438K and is both ferroelectric and ferroelastic below that temperature. The complete polarized Raman spectra in the ferroic phase have been measured and compared with those of the ferroelastic, centric polytype 2MC (α-Sb5O7I). Several lines could be attributed to Sb—0 and Sb—I vibrations. A factor group analysis has been performed and compatibility relations have been established connecting phonon species in the low and high temperature phase. As a function of temperature the spectra revealed a strongly temperature dependent central line and several phonon lines whose intensities vanish aboveT c . Using these phonon line intensities the temperature variation of the order parameter could be determined. The experimental results indicate that the phase transition is of first order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320117
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared and Raman study of Si2Te3 (1976)
    Springer
    The European physical journal 25 (1976), S. 319-322 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results of ir and Raman investigations on trigonal layer-structured Si2Te3 single crystals are reported. The ir reflection spectrum withE⊥c exhibits seven reststrahl-like bands, whereas the corresponding spectrum withE∥c shows only one very small bump. Values forε 0 andε ∞ are given. The Raman spectra are very rich in structure and can only be interpreted qualitatively as being a mixture of single phonon lines and one- and two-phonon density-of-states contributions. One-phonon density-of-states effects are disorder-induced owing to the statistical occurrence of the Si atoms within the regular hexagonal Te sublattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01315246
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