Crystal structures of optical recording materials Ge2Sb2+xTe5 and GeBi2Te4 have been studied in terms of the fast phase transition mechanism by both real- and reciprocal-space Rietveld analyses of pulsed neutron powder diffraction data. These crystalline phases had large local lattice distortions. In addition, the crystallite size of GeBi2Te4 was very small (about 150 Å). These results suggest that the similarity of entropy between crystalline and amorphous phases plays an important role in terms of the fast phase transition mechanism.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering