Physics – Condensed Matter – Materials Science
Scientific paper
2003-01-05
Physics
Condensed Matter
Materials Science
4 pages, 3 figures
Scientific paper
Lattice vibrations of the wurtzite-type AlN have been studied by Raman spectroscopy under high pressure up to the structural phase transition at 20 GPa. We have shown that the widely debated bond-bending E_2^1 mode of w-AlN has an abnormal positive pressure shift up to the threshold of the phase transition, whereas in many tetrahedral semiconductors the bond-bending modes soften on compression. This finding disagrees with the results of ab initio calculations, which give a "normal" negative pressure shift. Combination of high dynamical and low thermodynamical stability of AlN breaks the correlation between the mode Gruneisen parameters for the bond-bending modes and the transition pressure, which holds for CdS, InP, ZnO, ZnTe, ZnSe, ZnS, Ge, Si, GaP, GaN, SiC and BeO.
Gauthier Michel
Iakovenko E. V.
Polian Alain
No associations
LandOfFree
Bond-bending modes and stability of tetrahedral semiconductors under high pressure: a puzzle of AlN does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Bond-bending modes and stability of tetrahedral semiconductors under high pressure: a puzzle of AlN, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bond-bending modes and stability of tetrahedral semiconductors under high pressure: a puzzle of AlN will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-220000