Anomalous mode coupling and phase transition of KNbO 3 under high pressure
Abstract
Raman spectra of KNbO 3 under high pressure have been analyzed on the basis of the two-mode coupling model. It has been found that the phase transitions from orthorhombic to tetragonal and from tetragonal to cubic occur at 7 and 8 GPa, respectively, accompanied by an abrupt jump of the mode width of one mode. The mode coupling occurs even in the cubic phase.
- Publication:
-
Solid State Communications
- Pub Date:
- February 2000
- DOI:
- 10.1016/S0038-1098(99)00551-7
- Bibcode:
- 2000SSCom.113..713S
