Details

Autor(en) / Beteiligte

• Liu, X Q
• Li, X B
• Zhang, L
• Cheng, Y Q
• Yan, Z G
• Xu, M
• Han, X D
• Zhang, S B
• Zhang, Z
• Ma, E

Titel

New structural picture of the Ge2Sb2Te5 phase-change alloy

Ist Teil von

• Physical review letters, 2011-01, Vol.106 (2), p.025501-025501

Ort / Verlag

United States

Erscheinungsjahr

2011

Quelle

American Physical Society

Beschreibungen/Notizen

• Using electron microscopy and diffraction techniques, as well as first-principles calculations, we demonstrate that as much as 35% of the total Ge atoms in the cubic phase of Ge2Sb2Te5 locate in tetrahedral environments. The Ge-vacancy interactions play a crucial stabilizing role, leading to Ge-vacancy pairs and the sharing of vacancies that clusters tetrahedral Ge into domains. The Ge2Sb2Te5 structure with coexisting octahedral and tetrahedral Ge produces optical and structural properties in good agreement with experimental data and explains the property contrast as well as the rapid transformation in this phase-change alloy.