[Pw_forum] gap in the phonon DOS

[Reza Ebraahimi]

Hi
I have a question. Does the existence of a gap in the high-energy region of the phonon DOS means ionicity of the crystal (splitting of the TO and LO-like phonons)? The higher the gap, means the more ionicity?
Thank You for any reply

Reza Ebraahimi- Graduate Student
Tehran University 


      
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