High Pressure Structural Phase Transition in BaSe and BaTe

The structural phase transition due to high pressure in BaSe and BaTe is investigated for the first time using an interionic potential approach, based on the shell model formulation. The model parameters are derived using dielectric properties. The results show good agreement with experiment. The nature of the force constants at equilibrium and high pressure is discussed. Der strukturelle Hochdruck-Phasenubergang in BaSe und BaTe wird erstmals mit einem Interionenpotentialverfahren untersucht, das auf der Schalenmodellformulierung beruht. Die Modellparameter werden aus den dielektrischen Eigenschaften abgeleitet. Die Ergebnisse zeigen gute Ubereinstimmung mit dem Experiment. Die Art der Kraftkonstanten im Gleichgewicht und bei hohem Druck wird diskutiert.

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