Coupled phase transitions in Pb1−xGexTe

  • H. Yaraneri
  • A. D. C. Grassie
  • J. W. Loram
6. Lattice Dynamics and Phase Transition
Part of the Lecture Notes in Physics book series (LNP, volume 152)


The specific heats of samples of Pb1−xGexTe (0.01 < x < 0.09) in the temperature range 2 to 200 K show two peaks for x < 0.03 and three for 0.03 < x < 0.08. The two peaks are associated with the main structural phase transition and with a low temperature tunnelling mode of the small Ge++ ions between two equivalent positions in the distorted unit cell. The additional peak observed over the restricted range of concentrations is associated with the predicted inhomogenous phase arising from coupling between the structural phase transition and the concentration gradient of Ge++.


Structural Phase Transition Spinodal Decomposition Uniform Lattice Local Dipole Brillouin Zone Centre 


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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • H. Yaraneri
    • 1
  • A. D. C. Grassie
    • 1
  • J. W. Loram
    • 1
  1. 1.Physics DivisionUniversity of SussexBrighton

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