The three-dimensional atomic configuration of amorphous Ge2 Sb2 Te5 and GeTe were derived by reverse Monte Carlo simulation with synchrotron-radiation x-ray diffraction data. The authors found that amorphous Ge2 Sb2 Te5 can be regarded as "even-numbered ring structure," because the ring statistics is dominated by four- and six-fold rings analogous to the crystal phase. On the other hand, the formation of Ge-Ge homopolar bonds in amorphous GeTe constructs both odd- and even-numbered rings. They believe that the unusual ring statistics of amorphous Ge2 Sb2 Te5 is the key for the fast crystallization speed of the material.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)