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Pressure-induced instability in CdO.
- Source :
-
Physica Status Solidi (B) . Jul2014, Vol. 251 Issue 7, p1426-1430. 5p. - Publication Year :
- 2014
-
Abstract
- The lattice dynamics of rocksalt CdO is studied as a function of pressure using density-functional linear-response theory. The predicted static phase-transition pressure from rocksalt (B1) to CsCl (B2) structures is 76.12 GPa. Analysis of the phonon calculations suggests that the pressure-induced instabilities at p = 78.26 GPa of the transverse acoustic (TA) modes in a large portion of the Brillouin zone are responsible for the phase transition from B1 → B2 phases of CdO. Moreover, the calculated partial phonon density of states at the precursor phase transition of p = 70 GPa reveals strong reduction of the longitudinal acoustic Cd-like modes and the existence of a large peak related to the longitudinal optic O-like mode. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LATTICE dynamics
*CRYSTAL lattices
*SOLIDS
*ROCK salt
*SALT
*PHONONS
Subjects
Details
- Language :
- English
- ISSN :
- 03701972
- Volume :
- 251
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Physica Status Solidi (B)
- Publication Type :
- Academic Journal
- Accession number :
- 97012312
- Full Text :
- https://doi.org/10.1002/pssb.201350208