The phase-change mechanism of the rewritable optical media was studied. An amorphous as-deposited GST layer was crystallized by exposure to a laser beam of intensity sufficient to heat the material to a temperature slightly above the glass-transition temperature. It was observed that crystalline GeTe possessed a certain amount of vacancies on Ge sites. It was found that GST can be viewed as being built from well-defined rigid blocks of the composition Ge 2Sb2Te5. It was suggested that the mechanism of the structural phase transition provides potentially critical insight in the search for better performing materials.
ASJC Scopus subject areas
- 化学 (全般)