Coexistence of tetrahedral-and octahedral-like sites in amorphous phase change materials
Chalcogenide alloys are materials of interest for optical recording and nonvolatile memories.
We perform ab initio molecular dynamics simulations aiming at shading light onto the
structure of amorphous Ge 2 Sb 2 Te 5 (GST), the prototypical material in this class. First
principles simulations show that amorphous GST obtained by quenching from the liquid
phase displays two types of short range order. One third of Ge atoms are in a tetrahedral
environment while the remaining Ge, Sb, and Te atoms display a defective octahedral …
We perform ab initio molecular dynamics simulations aiming at shading light onto the
structure of amorphous Ge 2 Sb 2 Te 5 (GST), the prototypical material in this class. First
principles simulations show that amorphous GST obtained by quenching from the liquid
phase displays two types of short range order. One third of Ge atoms are in a tetrahedral
environment while the remaining Ge, Sb, and Te atoms display a defective octahedral …
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