A body-centered-cubic polymorph of the Ge2Sb2Te5 phase change alloy

作者：Cheng Y Q^*; Xu M; Sheng H W; Meng Y; Han X D; Ma E

来源：Applied Physics Letters, 2009, 95(13): 131904.

DOI：10.1063/1.3240885

In Ge2Sb2Te5 (GST), the prototype phase-change alloy for data storage, in situ x-ray diffraction experiments reveal a pressure-induced crystalline-amorphous-crystalline transition sequence, all at the same fixed composition and in one experimental cycle. A body-centered-cubic polymorph is discovered at high pressures; the formation of this phase is attributable to its high packing density rendered possible by the switch from covalent to metallic bonding as predicted by ab initio calculations.

• 出版日期2009-9-28
• 单位北京工业大学