Raman Spectroscopic Investigation of the Ferroelectric Soft Mode in Pb5Ge3O11 under High Hydrostatic Pressure

  • T. Suski
  • W. Müller-Lierheim
  • W. Dultz
  • H. Krause
  • H. H. Otto
  • W. Gebhardt


Lead germanate, Pb5Ge3O11, undergoes a uniaxial, almost second-order, phase transition at 450 K from the ferroelectric phase with the space group P3 to the paraelectric phase with the space group P6 [1–7]. The spontaneous polarization in the ferroelectric phase is parallel to [001]; there are only two (180°) domains which are enantiomorphous [8–10]. Pb5Ge3O11 is optically active in [001]-direction, and the handedness of the optical rotation can be reversed by the application of an external electric field [8], which reverses the domain orientation.


Raman Spectrum Pressure Dependence Ferroelectric Phase Soft Mode Paraelectric Phase 
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Copyright information

© Springer Science+Business Media New York 1979

Authors and Affiliations

  • T. Suski
    • 1
  • W. Müller-Lierheim
    • 1
  • W. Dultz
    • 1
  • H. Krause
    • 1
  • H. H. Otto
    • 1
  • W. Gebhardt
    • 1
  1. 1.Universität RegensburgRegensburgW. Germany

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