, Volume 36, Issue 6, pp 595–601 | Cite as

A phenomenological approach for the phonon dispersion curves of barium

  • A E Arua
  • L A Hussain


A phenomenological model which combines the axially symmetric ion-ion interaction with the electron-ion interaction scheme of Bhatia has been successfully used to calculate the phonon dispersion curves of bcc Ba. In particular, when the elastic constants determined by Mizukiet al are used as input data, the model successfully reproduces the anomalous feature of the dispersion curves measured by them. On the other hand, when the elastic constants determined by Buchenauet al are used, the model produces a cross over of the longitudinal and transverse branches in the [100] direction, a feature not established in their measurements. Thus the features of the dispersion curves in the [100] direction which is due to the hybridization of thes andd states are evident in the measured elastic constants and are consistent with the values of C12-C44.


Phenomenological model phonon frequencies barium 




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Copyright information

© Indian Academy of Sciences 1991

Authors and Affiliations

  • A E Arua
    • 1
  • L A Hussain
    • 1
    • 2
  1. 1.Department of PhysicsObafemi Awolowo UniversityIle IfeNigeria
  2. 2.Department of PhysicsUniversity of IbadanIbadanNigeria

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